US2225294A - Cleaning process - Google Patents
Cleaning process Download PDFInfo
- Publication number
- US2225294A US2225294A US188924A US18892438A US2225294A US 2225294 A US2225294 A US 2225294A US 188924 A US188924 A US 188924A US 18892438 A US18892438 A US 18892438A US 2225294 A US2225294 A US 2225294A
- Authority
- US
- United States
- Prior art keywords
- sulfamic acid
- calcareous
- acid
- deposits
- well
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000004140 cleaning Methods 0.000 title description 7
- 238000000034 method Methods 0.000 title description 7
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 description 30
- 239000002253 acid Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 150000007513 acids Chemical class 0.000 description 4
- 235000011167 hydrochloric acid Nutrition 0.000 description 4
- RSIPQRDGPVEGLE-UHFFFAOYSA-L calcium;disulfamate Chemical compound [Ca+2].NS([O-])(=O)=O.NS([O-])(=O)=O RSIPQRDGPVEGLE-UHFFFAOYSA-L 0.000 description 3
- 235000013365 dairy product Nutrition 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000012047 saturated solution Substances 0.000 description 2
- 208000004434 Calcinosis Diseases 0.000 description 1
- 235000021513 Cinchona Nutrition 0.000 description 1
- 241000157855 Cinchona Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 241000490229 Eucephalus Species 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 229930013930 alkaloid Natural products 0.000 description 1
- 150000003797 alkaloid derivatives Chemical class 0.000 description 1
- UMGDCJDMYOKAJW-UHFFFAOYSA-N aminothiocarboxamide Natural products NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 1
- 229940043430 calcium compound Drugs 0.000 description 1
- 150000001674 calcium compounds Chemical class 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000003222 pyridines Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 150000003585 thioureas Chemical class 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/12—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S507/00—Earth boring, well treating, and oil field chemistry
- Y10S507/933—Acidizing or formation destroying
Definitions
- This invention relates to the removal of calcareous deposits and is more particularly directed to compositions and processes wherein calcareous deposits are dissolved employing sulfamic acid.
- Calcareous deposits are found in widely varying relationsgfor instance as a scale in boiler tubes, as an eillorescence from the mortar on walls. as a deposit in dairy equipment, or as an obstruction to the now oi oil in oil wells.
- calcareous deposits may be dissolved and removed from undesired relations by the use of sulfamic acid.
- the use of sulfamic acid to remove calcareous deposits presents a number of advantages arising from the go fact that sulfamic acid can readily and safely be handled and from the fact that it is much less corrosive than acids heretofore used.
- sulfamic acid is particularly advantageous for the reason that calcium sulfamate,-the product :5 of its reaction with calcium deposits, is relatively water-soluble and can easily be washed away.
- acids such as sulfuric and phosphoric the products formed when calcareous deposits are dissolved are insoluble calcium compounds such a as -calcium sulfate and calcium phosphate and these reaction products are themselves dimcult to remove in some instances.
- a sulfamic acid solution may be intro- '35 substituted into the well in dilute or saturated solutions in any desired quantity.
- a saturated solution containing excess sulfamic acid in suspended form may be used in which event the solution strength will remain about the same until all of g the suspended sulfamic acid is dissolved. In this way a considerable amount of acid can be introduced in a relatively small volume of liquid without a sudden violent reaction followed by a rapidly decreasing activity as would result with acids 5 heretofore used.
- an inhibitor such as a cinchona bark alkaloid bark derivative, a pyridine derivative, or a substituted thiourea may be used in known manner.
- Bulfamic acid is less corrosive than hydrochloric acid, for instance, and may be handled with considerably greater ease and with considerably less hazard than materials heretofore used.
- sulfamic acid used for cleaning calcareous 59 residues from boiler tubes may conveniently be used in conjunction with inhibitors as'above described.
- Sulfamic acid is much safer to use than acids such as hydrochloric acid heretofore used for this purpose and sulfamic acid is not as irritating to the hands of workmen using it as is muriatic acid. it w
- the removal of calcareous residues with sulfamic acid according-to our invention is particularly advantageous in the cleaning of dairy equipment. copper or copper alloys, for the most part, and is very readily damaged by the use of cleaning agents heretofore proposed. Sulfamic acid may easily and effectively be used to remove nilkstone from dairy equipment without appreciable damage to the equipment. It is particularly advantageous to follow the practice of our invention because of the ease and safety of handling sulfamic acid.
- Sulfamic acid will also be found advantageous for the cleaning of equipment such as aluminum or tinware by reason of the fact that it reacts only slowly with aluminum or tin.
- steps comprising applying an aqueous solution of sulfamic acid to the said deposit at least partially to dissolve said calcareous deposit, and then removing the resulting aqueous solution which contains the dissolved material from the said location.
- a method of treating a well comprising introduclng a solution comprising sulfamic acid into said well to react with substances in fluid communication with said well.
- a methodvof acidizing an oil well comprising forcing a solution comprising sulfamic acid into said well and into geological formations adjacent said well to react with and open up said geological formations.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Description
Patented Dec. 17, 1940 Delaadgnontoll.
.1. I... am: Deb, a corporation or N p mi 1' 5,1938, 7 8. aster 40mm. (cuss-s1) This invention relates to the removal of calcareous deposits and is more particularly directed to compositions and processes wherein calcareous deposits are dissolved employing sulfamic acid.
6 Calcareous deposits are found in widely varying relationsgfor instance as a scale in boiler tubes, as an eillorescence from the mortar on walls. as a deposit in dairy equipment, or as an obstruction to the now oi oil in oil wells. The
in removal of calcareous deposits presents considerable difliculty since to dissolve such materials with an acid such as hydrochloric acid frequently efl'ects considerable damage to underlying metal or surrounding material.
15 Now we have found that calcareous deposits may be dissolved and removed from undesired relations by the use of sulfamic acid. The use of sulfamic acid to remove calcareous deposits presents a number of advantages arising from the go fact that sulfamic acid can readily and safely be handled and from the fact that it is much less corrosive than acids heretofore used.
sulfamic acid is particularly advantageous for the reason that calcium sulfamate,-the product :5 of its reaction with calcium deposits, is relatively water-soluble and can easily be washed away. With acids such as sulfuric and phosphoric the products formed when calcareous deposits are dissolved are insoluble calcium compounds such a as -calcium sulfate and calcium phosphate and these reaction products are themselves dimcult to remove in some instances.
In the cleaning of wells to remove calcareous material, a sulfamic acid solution may be intro- '35 duced into the well in dilute or saturated solutions in any desired quantity. A saturated solution containing excess sulfamic acid in suspended form may be used in which event the solution strength will remain about the same until all of g the suspended sulfamic acid is dissolved. In this way a considerable amount of acid can be introduced in a relatively small volume of liquid without a sudden violent reaction followed by a rapidly decreasing activity as would result with acids 5 heretofore used. If desired, an inhibitor such as a cinchona bark alkaloid bark derivative, a pyridine derivative, or a substituted thiourea may be used in known manner.
Bulfamic acid is less corrosive than hydrochloric acid, for instance, and may be handled with considerably greater ease and with considerably less hazard than materials heretofore used.
sulfamic acid offers the further advantage that it can readily be handled in solid form in which a condition it does not require special facilities for transportation required for an acid such as hydrochloric. In some instances it will be found practical simply to dump solid sulfamic acid into a well, adding a suitable amount of water later if necessary. Using solid sulfamic. acid in this =6 manner the well casing at notime comes in contact with a corrosive medium.
I The removal of calcareous residues from boiler tubes presents a problem in some respects similar to the problem of well cleaning and it will be 10 found that sulfamic acid is admirably adapted to I this use. According to our invention we employ a sulfamic acid solution or suspension of the desired strength and this is pumped or allowed to run by gravity into boiler tubes which are encrusted with calcareous residue. After the sulfamic acid solution has remained in the boiler tubes long enough to loosen the boiler scale, the boiler tubes should then be flushed with water.
sulfamic acid used for cleaning calcareous 59 residues from boiler tubes may conveniently be used in conjunction with inhibitors as'above described.
Because of the relatively small installations treated andbecause of the relatively long treat- 2!; ing time required, it is particularly advantageous for the cleaning of boiler tubes to have a material which does not attack the metal of the boiler rapidly and which is not hazardous or difficult to handle. For these reasons sulfamic acid is ideally adapted to this use. It will also be observed that for other similar uses such as the re-' moval of. calcareous residues fromhot water heating systems, heat exchangers, and automobile radiators, sulfamic acid offers the same advantages.
'I'hecleaning of boiler tubes and other such equipment with sulfamic acid is further advantageous for the reason that the calcium sulfamate which results from the dissolving action 40 is highly water soluble, about sixty-seven parts dissolving in one hundred parts of water at 25 C. By reason of its great solubility the calcium sulfamate may easily be washed from boiler tubes, heat exchangers, and other such equipment. sulfamic acid may easily and effectively be used to remove calcareous residue from cements. Calcareous residues which are very objectionable form on brick walls, the calcareous 0 material eillorescing from the cement or mortar between the bricks. Calcareous residues on concrete structures and in other such relations may also be removed. with advantage by the use of sulfamic acid.
Sulfamic acid is much safer to use than acids such as hydrochloric acid heretofore used for this purpose and sulfamic acid is not as irritating to the hands of workmen using it as is muriatic acid. it w The removal of calcareous residues with sulfamic acid according-to our invention is particularly advantageous in the cleaning of dairy equipment. copper or copper alloys, for the most part, and is very readily damaged by the use of cleaning agents heretofore proposed. Sulfamic acid may easily and effectively be used to remove nilkstone from dairy equipment without appreciable damage to the equipment. It is particularly advantageous to follow the practice of our invention because of the ease and safety of handling sulfamic acid.
Sulfamic acid will also be found advantageous for the cleaning of equipment such as aluminum or tinware by reason of the fact that it reacts only slowly with aluminum or tin.
From the foregoing it will be understood that 4 sulfamic acid may advantageously be used in a Such equipment is constructed of to the art with respect to other materials for removing calcareous residues and deposits.
While we have shown certain illustrative compositions and processes it will be understood that without departing from the spirit of our invention those skilled in the art may readily devise numerous compositions and processes wherein sulfamic acid is employed for removal of calcareous deposits.
We claim:
1. In a process for removing calcareous deposits, the step-oomprising contacting such a deposit .with' suli'amic acid.
2. In-a process for the removal of a calcareous deposit from a location at which it has formed, the steps comprising applying an aqueous solution of sulfamic acid to the said deposit at least partially to dissolve said calcareous deposit, and then removing the resulting aqueous solution which contains the dissolved material from the said location.
3. A method of treating a well comprising introduclng a solution comprising sulfamic acid into said well to react with substances in fluid communication with said well.
4. A methodvof acidizing an oil well comprising forcing a solution comprising sulfamic acid into said well and into geological formations adjacent said well to react with and open up said geological formations. I 1
. Ell-HER K. BOLTON.
JAMES K. HUNT.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US188924A US2225294A (en) | 1938-02-05 | 1938-02-05 | Cleaning process |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US188924A US2225294A (en) | 1938-02-05 | 1938-02-05 | Cleaning process |
Publications (1)
Publication Number | Publication Date |
---|---|
US2225294A true US2225294A (en) | 1940-12-17 |
Family
ID=22695129
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US188924A Expired - Lifetime US2225294A (en) | 1938-02-05 | 1938-02-05 | Cleaning process |
Country Status (1)
Country | Link |
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US (1) | US2225294A (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2472400A (en) * | 1946-11-22 | 1949-06-07 | Pure Oil Co | Method of protecting metal surfaces against hydrogen sulfide corrosion |
US2653126A (en) * | 1950-02-23 | 1953-09-22 | Rca Corp | Method of marking |
US2799648A (en) * | 1953-07-29 | 1957-07-16 | Texas Co | Inhibition of corrosion |
US2847384A (en) * | 1954-10-19 | 1958-08-12 | Wyandotte Chemicals Corp | Descalant composition and use |
US2947703A (en) * | 1958-07-16 | 1960-08-02 | Nalco Chemical Co | Process of inhibiting corrosion of ferrous metals in contact with aqueous solutions of acids |
US2977318A (en) * | 1956-06-20 | 1961-03-28 | Hagan Chemicals & Controls Inc | Substituted amide inhibited acid compositions |
US2994664A (en) * | 1958-02-19 | 1961-08-01 | Nalco Chemical Co | Dry acid cleaning compositions |
US3124534A (en) * | 1964-03-10 | Moocxch | ||
US3211659A (en) * | 1961-10-02 | 1965-10-12 | Purex Corp Ltd | Process and compositions for cleaning shell eggs |
US5431839A (en) * | 1993-07-09 | 1995-07-11 | Rhone-Poulenc Chimie | Sulfamic acid cleaning/stripping compositions comprising heteropolysaccharide thickening agents |
US5998349A (en) * | 1995-10-03 | 1999-12-07 | Rhodia Chimie | Descaling and cleaning compositions containing cellulose microfibrils |
US9061275B2 (en) | 2013-03-14 | 2015-06-23 | Steag Energy Services Gmbh | Methods of removing calcium material from a substrate or catalytic converter |
-
1938
- 1938-02-05 US US188924A patent/US2225294A/en not_active Expired - Lifetime
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3124534A (en) * | 1964-03-10 | Moocxch | ||
US2472400A (en) * | 1946-11-22 | 1949-06-07 | Pure Oil Co | Method of protecting metal surfaces against hydrogen sulfide corrosion |
US2653126A (en) * | 1950-02-23 | 1953-09-22 | Rca Corp | Method of marking |
US2799648A (en) * | 1953-07-29 | 1957-07-16 | Texas Co | Inhibition of corrosion |
US2847384A (en) * | 1954-10-19 | 1958-08-12 | Wyandotte Chemicals Corp | Descalant composition and use |
US2977318A (en) * | 1956-06-20 | 1961-03-28 | Hagan Chemicals & Controls Inc | Substituted amide inhibited acid compositions |
US2994664A (en) * | 1958-02-19 | 1961-08-01 | Nalco Chemical Co | Dry acid cleaning compositions |
US2947703A (en) * | 1958-07-16 | 1960-08-02 | Nalco Chemical Co | Process of inhibiting corrosion of ferrous metals in contact with aqueous solutions of acids |
US3211659A (en) * | 1961-10-02 | 1965-10-12 | Purex Corp Ltd | Process and compositions for cleaning shell eggs |
US5431839A (en) * | 1993-07-09 | 1995-07-11 | Rhone-Poulenc Chimie | Sulfamic acid cleaning/stripping compositions comprising heteropolysaccharide thickening agents |
US5998349A (en) * | 1995-10-03 | 1999-12-07 | Rhodia Chimie | Descaling and cleaning compositions containing cellulose microfibrils |
US9061275B2 (en) | 2013-03-14 | 2015-06-23 | Steag Energy Services Gmbh | Methods of removing calcium material from a substrate or catalytic converter |
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