WO2010104725A1 - Method and chemical composition to improve efficiency of mechanical pulp - Google Patents
Method and chemical composition to improve efficiency of mechanical pulp Download PDFInfo
- Publication number
- WO2010104725A1 WO2010104725A1 PCT/US2010/026148 US2010026148W WO2010104725A1 WO 2010104725 A1 WO2010104725 A1 WO 2010104725A1 US 2010026148 W US2010026148 W US 2010026148W WO 2010104725 A1 WO2010104725 A1 WO 2010104725A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- composition
- pulp
- wood chips
- mechanical
- hydrosulfite
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C1/00—Pretreatment of the finely-divided materials before digesting
- D21C1/06—Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
- D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/64—Alkaline compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/10—Retention agents or drainage improvers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/32—Bleaching agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/1026—Other features in bleaching processes
- D21C9/1042—Use of chelating agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
Definitions
- This invention relates to improving fiber quality and process efficiency in mechanical pulping. More specifically, the invention relates to using specialty chemical compositions such as combinations of a reductive chemical and a chelant in an alkaline medium to improve the process efficiency and brightness of a paper product produced from a pulp material manufactured in such a process.
- the invention has particular relevance for decreasing freeness, providing energy and chemical savings, and enhancing brightness of paper products.
- Mechanical pulping is a common method to produce pulp.
- One advantage mechanical pulping has over other pulping methods is that the pulping process does not result in a significant loss of mass. Mechanical pulping operations unfortunately are very energy-intensive and they tend to produce pulps with low strength.
- Chemical treatment, such as alkalization is sometimes used to increase strength and save energy, at the expense of brightness.
- SGW stone ground wood
- PGW pressurized ground wood
- RMP refiner mechanical pulp
- PRMP pressurized RMP
- TRMP thermo-RMP
- TMP thermo-mechanical pulp
- At least one embodiment of the invention is directed towards a composition and a method of its use.
- the composition improves the papermaking process.
- the composition comprises a base, a small quantity of a strong reductive chemical, and a chelating agent.
- the composition is added to the papermaking process before or during the mechanical pulping of wood chips.
- the composition decreases the energy consumption in pulp manufacturing but does not induce a net decrease in brightness of paper produced from the paper pulp when compared to paper similarly produced from similar paper pulp that did not have the composition added to its wood chips.
- the composition can be an aqueous solution or slurry capable of being applied at any stage of the mechanical pulping process, before or during the refining, e.g., in a wood chip washing operation, chip soaking, sprayed over the chips, and maybe capable of being added directly into a refiner.
- At least one embodiment of the invention is directed towards a composition wherein the base is selected from the list consisting of: an alkali or alkaline earth metal hydroxide such as sodium hydroxide, magnesium hydroxide and any combination thereof.
- the base is selected from the list consisting of: an alkali or alkaline earth metal hydroxide such as sodium hydroxide, magnesium hydroxide and any combination thereof.
- One preferred composition can induce the resulting pulp to be more effectively bleached by peroxide or hydrosulfite bleaching including but not limited to treatment with magnesium hydroxide. Treatment of wood chips before or during mechanical pulping with small quantities of magnesium hydroxide, activates the pulp to subsequent bleaching, specifically peroxide bleaching.
- At least one embodiment of the invention is directed towards a composition in which the reductive chemical is selected from the list consisting of: water soluble hydrosulfites (dithionites), sulfites, bisulfites, metabisulfites, formidinesulfmic acid, salts of formidinesulfinic acid, borohydrides, phosphines, phosphonium tertiary salts; more specifically, alkali or alkaline earth metal hydrosulfites, borohydrides, sodium hydrosulfite, sodium borohydride and any combination thereof.
- water soluble hydrosulfites dithionites
- sulfites bisulfites, metabisulfites
- formidinesulfmic acid salts of formidinesulfinic acid
- borohydrides phosphines, phosphonium tertiary salts
- alkali or alkaline earth metal hydrosulfites borohydrides, sodium hydrosulfite, sodium borohydride and any combination
- the chelating agent can be a transitional metal ion chelant selected from the list consisting of: organic hydroxyacids, aminophosphonates, aminophosphates, aminocarboxylates; more specifically, salts of DTPA 3 salts of EDTA, salts of DTMPA, and any combination thereof.
- a transitional metal ion chelant selected from the list consisting of: organic hydroxyacids, aminophosphonates, aminophosphates, aminocarboxylates; more specifically, salts of DTPA 3 salts of EDTA, salts of DTMPA, and any combination thereof.
- CSF Canadian Standard Freeness a described by TAPPI methods and standards and measured in millimeters.
- Freeness means the measure of the rate at which a suspension of pulp may be drained, and is typically measured according to the Canadian Standard Freeness test, as defined by TAPPI methods and standards. Changes in freeness can result from both chemical and physical changes in pulp.
- Mechanical pulping means a physical change caused by converting pulpwood logs and chips into pulp by the use of mechanical energy.
- Chemimechanical pulping means a mild chemical change occurring in a wood grinding or chip refining process. Chemimechanical pulping commonly improves paper strength or facilitates paper production.
- Refiner groundwood means mechanical pulp made with a grinder and put through a rubbing, brushing, crushing, fraying, or cutting treatment in a pulp mill processing machine called a refiner.
- Refiner mechanical pulp means pulp made by processing untreated wood chips in mechanical atmospheric refiners.
- Refiner means a machine for mechanical treating fibers in pulp and paper mils when rubbing, brushing, crushing, fraying, or cutting is desired to process or impart certain properties to the finished pulp slurry and the sheet web formed on the paper machine.
- Standard Quantity means a concentration of an additive added to a suspension of paper pulp, which is insufficient to induce any substantial chemical changes in the pulp that are normally associated with chemimechanical pulping.
- magnesium hydroxide is used as a source of alkalinity.
- the magnesium hydroxide activates the pulp in the following peroxide or hydrosulfite bleaching stages, thereby increasing the degree of brightness that results from bleaching.
- the reaction in the refiner is adjusted to be reductive not oxidative. This also inhibits any brightness loss that uncontrolled oxidation would otherwise cause.
- a chelating agent may be added which further reduces any yellowing because it immobilizes transition metal cations that could otherwise catalyze yellowing reactions.
- magnesium hydroxide is combined with one or more reducing agents and, optionally, one or more chelating agents prior to the refining or in the refiner. In at least one embodiment, this combination is followed by peroxide bleaching.
- specialty chemicals are used in very small quantities and are believed to operate against the pulp only at a mechanical level and not at a chemimechanical level. Because of the low quantity used, no significant chemical changes occur in the pulp. The low quantity of specialty chemicals, however, is sufficient to cause the freeness reduction in the pulp and thereby reduce the energy consumption during the mechanical pulping process. Because relatively little chemical changes occur in the pulp, this method can freely be used with most if not all currently known techniques used in most operating mills manufacturing mechanical pulp, which include but are not limited to TMP, RMP, and/or groundwood based pulps.
- small quantities of at least one reductive chemical and at least one chelant in an alkaline medium are used to treat wood chips during manufacturing of mechanical pulp.
- these chemicals are so combined, instead of the brightness loss that is typical of alkaline treatments, a brightness gain occurs.
- the small quantity of at least one reductive chemical and at least one chelant in an alkaline medium, applied prior to or at the refining stage enhances the bleaching process performed later in the papermaking process.
- the specialty chemicals added prior to or at the refining stage e.g., magnesium hydroxide alone or in a mixture with reductive chemical(s) and, optionally, chelant(s)
- the bleaching is peroxide or hydrosulfite bleaching.
- at least one of the sources of alkali is magnesium hydroxide (MH).
- the MH is used by itself, and the positive effect on brightness is observed after the peroxide or hydrosulfite bleaching stage.
- the MH is combined with sodium hydrosulfite and a chelant.
- At least one of the reductive chemicals is sodium hydrosulfite (SH).
- the SH is combined with magnesium hydroxide and a chelant.
- small quantities of a strong reductive chemical such as SH with or without sodium borohydride (BH) are combined with MH.
- small quantities of a strong reductive chemical such as SH with or without BH are combined with sodium hydroxide.
- at least one of the reductive chemicals is very small quantity of BH.
- the BH is combined with sodium hydrosulfite and a chelant.
- the source of alkali is MH.
- a small quantity of a strong reductive chemical such as SH with or without BH are combined with MH.
- This method makes use of chemicals commonly available in paper mills but uses them in a novel manner.
- BH and hydrosulfite is known in paper manufacture, it has only been used in bleaching processes, under neutral to slightly acidic conditions, and in kraft pulping processes, and not in mechanical pulping processes.
- US 5,338,402 utilizes similar chemicals to the invention but only in quantities large enough for chemimechanical pulping, targeting different pulp properties, and underdifferent process conditions.
- manufacturing CTMP that involves cooking at a temperature equal to or greater than 100 C using a reducing agent more electronegative than the sulfite ion together with sodium sulfite or bisulfite or a mixture of sulfur dioxide and sodium hydroxide.
- the reducing agent may be thiourea dioxide, sodium borohydride, or sodium dithionite.
- Another prior art source describes a multistage pretreatment process involving a reducing agent but is dissimilar to the inventive one step process.
- the source describes producing bleached pulp from wood chips via a process involving pretreatment of the chips first with at least one reducing agent (e.g., with a mixture of sodium sulfite and sodium borohydride) and then with an alkaline peroxide solution.
- at least one reducing agent e.g., with a mixture of sodium sulfite and sodium borohydride
- the pretreatments were followed by refiner defibration. ⁇ Brightening of Douglass-Fir Groundwood , Betz, R. G., Styan G. E., Pulp Paper Magazine Canada (1974) Volume 75 Pages 111-114).
- magnesium hydroxide and sodium hydrosulfite are combined with the mechanical pulp in a refiner to produce brighter mechanical pulp, hi at least one embodiment, a chelant is also added to wood chips prior to the refining operation or in the refiner.
- the specialty chemical is magnesium hydroxide, optionally with a chelant.
- magnesium hydroxide improves pulp brightness after hydrosulfite and, especially, peroxide bleaching by pulp activation towards these processes, while immediate post-refining brightness may still decrease.
- the specialty chemicals are in the form of an aqueous solution or slurry that can be fed directly to the refiner or sprayed over wood chips.
- the specialty chemicals are in the form of an aqueous solution or slurry that can be applied on wood chips during soaking or washing operations.
- Pulp samples were obtained from Midwestern American mills and from European mills (softwood TMP, TMP 1 st and 2 nd rejects). The doses are based on actives unless stated otherwise. DTPA has always been used in a form of a 38% solution (normally used in the industry) and the doses refer to this solution.
- Test A High temperature shock conditions: borohydride-based compositions with sodium hydroxide
- Test C Hydrosulfite treatment with sodium hydroxide followed by bleaching
- the samples were prepared as described in Test B, washed, dewatered and bleached under standard conditions (70 0 C, 1 h, 1.5% NaOH, 2% H 2 O 2 ). The samples were washed, and handsheets were made upon acidification to pH 5.
- Test E High temperature shock conditions: hydrosulfite-containing compositions with magnesium hydroxide
- a brightness test was conducted under wet temperature shock conditions simulating those in the refiner (no mechanical treatment).
- Samples of TMP were placed in plastic bags and mixed well with magnesium hydroxide and DTPA. The bags were opened, and the samples transferred into stainless steel digesters and degassed with nitrogen, for 7 minutes each. The remaining chemicals were added via a syringe into the volume of the pulp in a nitrogen flow.
- the 5%-consistency samples were kept at 150 0 C for 10 min in a rotating digester setup, cooled down, washed, pH measured and either handsheets were made or the pulp was subsequently bleached.
- the pH in all of the samples went from alkaline to slightly acidic, indicating a finished chemical reaction; therefore no acidification of the slurries was needed.
- Test F Moderate temperature shock conditions: hydrosulfite-containing compositions with magnesium hydroxide
- Test G Hydrosulfite treatment with magnesium hydroxide followed by peroxide bleaching
- Samples were prepared as described in Test E or F, washed with 2L DI water, dewatered and bleached under standard conditions (70 0 C, 1 h, 1.5% NaOH, 2% H 2 O 2 ). The samples were washed with 2L DI water and handsheets made upon acidification to pH 5.
- Test H Hydrosulfite treatment with magnesium hydroxide followed by hydrosulfite bleaching
- Samples were prepared as described in Test E or F, washed with IL DI water, dewatered and bleached under standard conditions (7O 0 C, 1 h, 1 Na 2 S 2 O 4 ). The samples were washed with 2L DI water, and handsheets were made.
- Table 5 lists the effect on brightness upon the thermal treatment of the pulp after the composition underwent peroxide bleaching.
- Tables 6-9 list the effect of the compositions (prototype products, 27% total solids) on paper products.
- Table 6 (C)
- Tables 9 and 10 provide the effect of one of preferred compositions, 19% NaOH, 0.316% NaBH 4 , 0.48% DTPA, 6.32% Na 2 S 2 O 4 (26.1-27.2% solids, depends on the impurities in the solid hydrosulfite).
- the composition was then diluted in paper pulp slurry so that the NaOH was reduced to 0.75% to o.d. pulp.
- Table 11 indicates the effect of using magnesium hydroxide as the alkali. Magnesium hydroxide is less expensive than other alkali. Compositions containing magnesium hydroxide requires less energy to undergo the pulping process. When substituting magnesium hydroxide for sodium hydroxide the replacement ratio is 0.75% sodium hydroxide for 0.5% magnesium hydroxide.
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020117023702A KR101718557B1 (en) | 2009-03-09 | 2010-03-04 | Method and chemical composition to improve efficiency of mechanical pulp |
EP10706889.2A EP2406425B1 (en) | 2009-03-09 | 2010-03-04 | Method and chemical composition to improve efficiency of mechanical pulp |
CN2010800118287A CN102348848A (en) | 2009-03-09 | 2010-03-04 | Method and chemical composition to improve efficiency of mechanical pulp |
JP2011554084A JP5669762B2 (en) | 2009-03-09 | 2010-03-04 | Method for improving the efficiency of mechanical pulp |
BRPI1009542-0A BRPI1009542B1 (en) | 2009-03-09 | 2010-03-04 | METHOD AND CHEMICAL COMPOSITION TO IMPROVE MECHANICAL PULP EFFICIENCY |
CA2753944A CA2753944C (en) | 2009-03-09 | 2010-03-04 | Method and chemical composition to improve efficiency of mechanical pulp |
RU2011135609/12A RU2530386C2 (en) | 2009-03-09 | 2010-03-04 | Method and chemical composition for improving efficiency of producing mechanical pulp |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/400,326 US20100224333A1 (en) | 2009-03-09 | 2009-03-09 | Method and chemical composition to improve efficiency of mechanical pulp |
US12/400,326 | 2009-03-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010104725A1 true WO2010104725A1 (en) | 2010-09-16 |
Family
ID=42104550
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2010/026148 WO2010104725A1 (en) | 2009-03-09 | 2010-03-04 | Method and chemical composition to improve efficiency of mechanical pulp |
Country Status (9)
Country | Link |
---|---|
US (1) | US20100224333A1 (en) |
EP (1) | EP2406425B1 (en) |
JP (1) | JP5669762B2 (en) |
KR (1) | KR101718557B1 (en) |
CN (1) | CN102348848A (en) |
BR (1) | BRPI1009542B1 (en) |
CA (1) | CA2753944C (en) |
RU (1) | RU2530386C2 (en) |
WO (1) | WO2010104725A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017102542A1 (en) * | 2015-12-15 | 2017-06-22 | Metgen Oy | Method for producing mechanical pulp from a biomass comprising lignocellulosic material |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040200586A1 (en) * | 2002-07-19 | 2004-10-14 | Martin Herkel | Four stage alkaline peroxide mechanical pulping |
CN1250811C (en) * | 2001-07-19 | 2006-04-12 | 安德里兹有限公司 | Four stage alkaline peroxide mechanical pulping |
US9932709B2 (en) * | 2013-03-15 | 2018-04-03 | Ecolab Usa Inc. | Processes and compositions for brightness improvement in paper production |
WO2012067113A1 (en) * | 2010-11-16 | 2012-05-24 | 三菱化学株式会社 | Cellulose fiber assembly and production method for same, fibrillated cellulose fiber and production method for same, and cellulose fiber complex |
EP2924166A1 (en) * | 2014-03-25 | 2015-09-30 | Basf Se | Method for the manufacture of bleached wood fibre |
BR102014027199B1 (en) * | 2014-07-14 | 2022-10-04 | Nalco Company | METHOD TO IMPROVE THE MANUFACTURING OF SODA OR KRAFT PULP |
CN106192509A (en) * | 2016-07-20 | 2016-12-07 | 昆明理工大学 | The technique promoting sulfate pulping combined by sodium borohydride and hydrogen peroxide |
KR102650372B1 (en) * | 2017-06-20 | 2024-03-21 | 바스프 에스이 | Method for increasing throughput and/or reducing energy use of a pulping process |
CN111139681B (en) * | 2019-12-26 | 2022-09-30 | 广西金桂浆纸业有限公司 | Chemi-mechanical pulp and manufacturing method thereof |
Citations (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB738815A (en) * | 1951-03-22 | 1955-10-19 | Asplund Arne J A | Improvements in or relating to the manufacture of pulp from fibrous ligno-cellulose-containing materials |
DE1955641A1 (en) | 1969-07-30 | 1971-02-04 | Vita Mayer & C Gia | Process for the production of high-white pulp for paper manufacture |
JPS4838328B1 (en) | 1970-07-08 | 1973-11-16 | ||
US3981765A (en) * | 1969-07-30 | 1976-09-21 | Vita Mayer & C. | Treatment of wood chips with an alkali metal borohydride solution followed by mechanical defibration |
DE2826821A1 (en) | 1977-06-17 | 1979-01-18 | Ventron Corp | PROCESS FOR REDUCING WOOD PULP OR CLAY |
US4211605A (en) * | 1978-08-03 | 1980-07-08 | Canadian International Paper Company | High yield chemimechanical pulping processes |
EP0027369A1 (en) | 1979-10-12 | 1981-04-22 | Thiokol Corporation | Stable precursor solution for the generation of hydrosulfite and use thereof in bleaching wood pulp, brightening kaolin clay and reducing vat dyestuffs to their leuco form |
US4324612A (en) | 1978-11-24 | 1982-04-13 | Mo Och Domsjo Aktiebolag | Process for the preparation of groundwood pulp |
US4502918A (en) * | 1981-06-10 | 1985-03-05 | Macmillan Bloedel Limited | Two-stage chemical treatment of mechanical wood pulp with sodium sulfite |
EP0141826A1 (en) | 1983-03-31 | 1985-05-22 | ERICKSON, Donald Charles | Cryogenic recycle distillation with multiple latent heat-exchange |
US4767499A (en) * | 1981-04-03 | 1988-08-30 | Simonson Rune G W | Method for the production of fiber pulp by impregnating lignocellulosic material with a sulphonating agent prior to refining |
WO1988010334A1 (en) | 1987-06-24 | 1988-12-29 | Eka Nobel Ab | Process for bleaching of materials with a dithionite solution |
WO1990011403A1 (en) | 1989-03-23 | 1990-10-04 | Hymac Ltd. | Bleaching process for the production of high bright pulps |
EP0485074A1 (en) | 1990-11-09 | 1992-05-13 | Morton International, Inc. | Pulp bleaching solution |
US5129987A (en) | 1988-03-16 | 1992-07-14 | Morton Thiokol, Inc. | Process for bleaching mechanical wood pulp with sodium hydrosulfite and sodium hydroxide in a refiner |
US5338402A (en) | 1987-05-25 | 1994-08-16 | Societe Atochem | Process for preparing a bleached chemithermomechanical pulp |
WO1996020308A1 (en) | 1994-12-28 | 1996-07-04 | Minerals Technologies Inc. | Bleaching of filled paper |
WO1997022749A1 (en) | 1995-12-19 | 1997-06-26 | Kvaerner Hymac Inc. | Process for treating refiner pulp |
WO2001059205A1 (en) | 2000-02-11 | 2001-08-16 | Holmen Aktiebolag | Method for bleaching mechanical and chemithermomechanical pulp |
US20040000380A1 (en) | 2002-06-28 | 2004-01-01 | Rangamannar Goda | Method for brightening pulp with hydrosulfite solution |
WO2005106110A1 (en) * | 2004-05-03 | 2005-11-10 | Centre Technique De L'industrie Des Papiers, Cartons Et Celluloses | Method for mechanical pulp production |
US20080105392A1 (en) | 2006-11-03 | 2008-05-08 | Duggirala Prasad Y | Method and composition for improving fiber quality and process efficiency in mechanical pulping |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3013934A (en) * | 1958-08-12 | 1961-12-19 | West Virginia Pulp & Paper Co | High yield pulp from hardwoods |
US3042575A (en) * | 1958-11-24 | 1962-07-03 | Stiftelsen Svensk Cellulosafor | Methods of improving the yield in alkaline digestion of cellulosic material |
SE303088B (en) * | 1963-05-31 | 1968-08-12 | Defibrator Ab | |
US3933676A (en) * | 1974-04-08 | 1976-01-20 | Ventron Corporation | Stabilized aqueous solutions of sodium borohydride |
SE446993B (en) * | 1980-07-09 | 1986-10-20 | Mo Och Domsjoe Ab | PROCEDURE FOR THE PREPARATION OF PINK GRINDING MACHINE |
SE456826B (en) * | 1986-04-18 | 1988-11-07 | Svenska Traeforskningsinst | SET TO REDUCE ENERGY CONSUMPTION BY REFINING CELLULOSALLY MATERIAL |
FR2634233B1 (en) * | 1988-07-12 | 1995-04-14 | Atochem | PROCESS FOR PRODUCING BLANCHED CHEMICOTHERMOMECHANICAL PASTES |
US5298118A (en) * | 1988-07-12 | 1994-03-29 | Atochem | Preparation of bleached chemithermomechanical pulp |
KR100228740B1 (en) * | 1997-06-30 | 1999-11-01 | 차동천 | The bleaching method for mechanical pulp |
US6881299B2 (en) * | 2001-05-16 | 2005-04-19 | North American Paper Corporation | Refiner bleaching with magnesium oxide and hydrogen peroxide |
US6743332B2 (en) * | 2001-05-16 | 2004-06-01 | Weyerhaeuser Company | High temperature peroxide bleaching of mechanical pulps |
EP1418269B1 (en) * | 2002-11-05 | 2009-02-11 | Rohm And Haas Company | Method for brightening virgin mechanical pulp |
US20040256065A1 (en) * | 2003-06-18 | 2004-12-23 | Aziz Ahmed | Method for producing corn stalk pulp and paper products from corn stalk pulp |
NZ562852A (en) * | 2005-04-08 | 2010-12-24 | Nalco Co | Improved composition and processes for paper production |
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2009
- 2009-03-09 US US12/400,326 patent/US20100224333A1/en not_active Abandoned
-
2010
- 2010-03-04 BR BRPI1009542-0A patent/BRPI1009542B1/en active IP Right Grant
- 2010-03-04 RU RU2011135609/12A patent/RU2530386C2/en active
- 2010-03-04 CN CN2010800118287A patent/CN102348848A/en active Pending
- 2010-03-04 EP EP10706889.2A patent/EP2406425B1/en active Active
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Patent Citations (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB738815A (en) * | 1951-03-22 | 1955-10-19 | Asplund Arne J A | Improvements in or relating to the manufacture of pulp from fibrous ligno-cellulose-containing materials |
DE1955641A1 (en) | 1969-07-30 | 1971-02-04 | Vita Mayer & C Gia | Process for the production of high-white pulp for paper manufacture |
DE2105324A1 (en) | 1969-07-30 | 1972-08-10 | Vita Mayer & C gia F Ih Vita SAS, Mailand (Italien) | Production of papermaking pulps |
US3981765A (en) * | 1969-07-30 | 1976-09-21 | Vita Mayer & C. | Treatment of wood chips with an alkali metal borohydride solution followed by mechanical defibration |
JPS4838328B1 (en) | 1970-07-08 | 1973-11-16 | ||
DE2826821A1 (en) | 1977-06-17 | 1979-01-18 | Ventron Corp | PROCESS FOR REDUCING WOOD PULP OR CLAY |
US4211605A (en) * | 1978-08-03 | 1980-07-08 | Canadian International Paper Company | High yield chemimechanical pulping processes |
US4324612A (en) | 1978-11-24 | 1982-04-13 | Mo Och Domsjo Aktiebolag | Process for the preparation of groundwood pulp |
EP0027369A1 (en) | 1979-10-12 | 1981-04-22 | Thiokol Corporation | Stable precursor solution for the generation of hydrosulfite and use thereof in bleaching wood pulp, brightening kaolin clay and reducing vat dyestuffs to their leuco form |
US4767499A (en) * | 1981-04-03 | 1988-08-30 | Simonson Rune G W | Method for the production of fiber pulp by impregnating lignocellulosic material with a sulphonating agent prior to refining |
US4502918A (en) * | 1981-06-10 | 1985-03-05 | Macmillan Bloedel Limited | Two-stage chemical treatment of mechanical wood pulp with sodium sulfite |
EP0141826A1 (en) | 1983-03-31 | 1985-05-22 | ERICKSON, Donald Charles | Cryogenic recycle distillation with multiple latent heat-exchange |
US5338402A (en) | 1987-05-25 | 1994-08-16 | Societe Atochem | Process for preparing a bleached chemithermomechanical pulp |
WO1988010334A1 (en) | 1987-06-24 | 1988-12-29 | Eka Nobel Ab | Process for bleaching of materials with a dithionite solution |
US5129987A (en) | 1988-03-16 | 1992-07-14 | Morton Thiokol, Inc. | Process for bleaching mechanical wood pulp with sodium hydrosulfite and sodium hydroxide in a refiner |
WO1990011403A1 (en) | 1989-03-23 | 1990-10-04 | Hymac Ltd. | Bleaching process for the production of high bright pulps |
EP0485074A1 (en) | 1990-11-09 | 1992-05-13 | Morton International, Inc. | Pulp bleaching solution |
WO1996020308A1 (en) | 1994-12-28 | 1996-07-04 | Minerals Technologies Inc. | Bleaching of filled paper |
WO1997022749A1 (en) | 1995-12-19 | 1997-06-26 | Kvaerner Hymac Inc. | Process for treating refiner pulp |
WO2001059205A1 (en) | 2000-02-11 | 2001-08-16 | Holmen Aktiebolag | Method for bleaching mechanical and chemithermomechanical pulp |
US20040000380A1 (en) | 2002-06-28 | 2004-01-01 | Rangamannar Goda | Method for brightening pulp with hydrosulfite solution |
WO2005106110A1 (en) * | 2004-05-03 | 2005-11-10 | Centre Technique De L'industrie Des Papiers, Cartons Et Celluloses | Method for mechanical pulp production |
US20080105392A1 (en) | 2006-11-03 | 2008-05-08 | Duggirala Prasad Y | Method and composition for improving fiber quality and process efficiency in mechanical pulping |
WO2008058003A2 (en) * | 2006-11-03 | 2008-05-15 | Nalco Company | Method and composition for improving fiber quality and process efficiency in mechanical pulping |
Non-Patent Citations (6)
Title |
---|
AKGUL, M.: "Determination of kraft NaBH4 pulping condition of Uldag fir", PAKISTAN JOURNAL OF BIOLOGICAL SCIENCES, vol. 9, 2006, pages 13 |
BETZ, R. G.; STYAN G. E.: "Brightening ofDouglass-Fir Groundyvood", PULP PAPER MAGAZINE CANADA, vol. 75, 1974, pages 111 - 114 |
HE, ZH.: "Further Understanding ofsodium Borohydride Assisted Peroxide Bleaching ofmechanical Pulps", APPITA JOURNAL, vol. 58, no. 1, 2005, pages 72 - 76 |
MELZER, J.; AUHOM, W.: "Treatment of Mechanical Wood Pulp with Reductive Bleaching Chemicals in Refiners", WOCHCNBLATT FUR PAPIERFABRIKATION, vol. 114, no. 8, 1986, pages 257 - 260 |
SELLERS, F. G.: "New hydrosulfite route reduces groundwood bleach costs", PULP & PAPER, vol. 47, no. 12, 1973, pages 80 - 82 |
WASSHAUSEN, J. ET AL.: ""Premix ": a novel process for improving bleaching of mechanical pulps for using a mixture ofreductive agents", PULP & PAPER CANADA, vol. 107, no. 3, 2006, pages 44 - 47 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017102542A1 (en) * | 2015-12-15 | 2017-06-22 | Metgen Oy | Method for producing mechanical pulp from a biomass comprising lignocellulosic material |
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RU2011135609A (en) | 2013-04-20 |
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