WO1999036157A1 - A system for preventing the emanation of vapors, odors, smoke and dusts in open spaces - Google Patents
A system for preventing the emanation of vapors, odors, smoke and dusts in open spaces Download PDFInfo
- Publication number
- WO1999036157A1 WO1999036157A1 PCT/IL1998/000607 IL9800607W WO9936157A1 WO 1999036157 A1 WO1999036157 A1 WO 1999036157A1 IL 9800607 W IL9800607 W IL 9800607W WO 9936157 A1 WO9936157 A1 WO 9936157A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- vapor
- vapors
- liquid
- source
- suction
- Prior art date
Links
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
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
- C23G5/02—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using organic solvents
- C23G5/04—Apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/402—Further details for adsorption processes and devices using two beds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/047—Pressure swing adsorption
Definitions
- the present invention relates to a method and a system for preventing the emanation of entrained substances such as vapors, smoke, odors or dust from open spaces. More particularly, the invention relates to a method and a system for collecting and recovering organic vapors, which emanate in open spaces and their recycling in a liquid form to be reused or disposed of.
- An open space is defined as a region in space, at some distance from the source of the emission ("the Source"). This Source is freely connected to other regions in space (“the Surroundings”) that are to be protected from the intrusion of the said entrained substance.
- the immediate region surrounding an emission source in the open air is an "Open Space" according to our definition.
- the immediate region surrounding an emission source when both are contained within a permanent total enclosure (a building, or a room, or an enclosure, that has been set specifically around a working region such as to contain a discharge of gas or vapor to other regions in space, etc.) is also defined as an "Open Space".
- a process and apparatus for recovering volatile vapors from a mixture of air and a volatile compound.
- the process includes the cooling of the mixture to condense volatile liquid vapors and moisture and collecting thereof.
- the cooled and dehumidified mixture is circulated through a bed of adsorbent, thus desorbing and recovering the volatile liquids from the bed by absorption and condensation.
- a system is provided for recovering volatile-liquid vapor from an air-volatile liquid vapor mixture.
- the system includes a reaction vessel, which has a bed of adsorbent for adsorbing the volatile liquid vapor, which is then recovered by means of a vacuum pump.
- a vapor recovery system wherein the condensable organic compounds, contained in a hydrated air mixture are removed, first by dehydrating the vapors using refrigeration, then followed by an indirect heat exchange with a refrigerant gas at cryogenic temperature in a chiller.
- An additional aspect addressed by the present invention concerns the prevention of harmful or unpleasant Entrained Substances from polluting nearby surroundings and the environment.
- a common problem afflicting modern civilization is the release of vapors, smoke, odors and dust in various human activities that it would be beneficial to prevent or reduce. For example, cigarette, cigar and pipe smoking, vapors and odors that emanate from a cooking stove, smoke and odors from a barbecue stand, etc. It is a further object of the present invention to provide a mechanism that can be adapted to such undesirable emissions and reduce their expansion to the surrounding space.
- the invention relates to a system for preventing Entrained Substances, as defined above, in open spaces from spreading the surrounding space and their accumulation or recovery.
- the following description pertains specifically to the collection and recovery of a vapor.
- the system consists of three main parts:
- a directed nozzle or system of nozzles located close to the source of the Entrained Substances and facing away from the source, the rate of suction through the nozzle(s) being calculated to generate a forced flow field that is directed away from the open surrounding space and towards the nozzle(s), and having a velocity such as to counteract closely the spontaneous convection and diffusion currents of the Entrained Substances from the source to the surrounding.
- a shroud around the source and nozzle(s) region may be added to protect this region; (b) a pumping device with suction from the nozzle(s) and discharging its flow into a an accumulation or recovery system wherein the Entrained Substances are accumulated for future recovery and/or disposal, or wherein they are converted into a liquid or solid condensed form for immediate recovery or disposal.
- the remaining gas-vapor mixture is conveyed to a vapor separation device thus reducing the vapor content of the effluent stream to an acceptable level, including a second condenser and liquid separator.
- a drier is provided, to remove water vapors from the separated gas-vapor mixture, prior to the first or the second condenser and liquid separator.
- the major inventive step in the present invention follows the following: By collecting the vapors as prescribed above, one prevents the emission at or close to the source without unnecessary dilution of the vapors with air that would force the handling of a much larger volume and also encumber the recovery of the vapors. At the same time, this collection is done such as not to promote unwarranted emanation of vapors from the source, as would be caused for example, if a nozzle is directed toward a liquid interface source, thereby promoting evaporation.
- Figure 1 illustrates in a schematic form the system of the present invention.
- the system consists of three main parts: (a) a directed nozzle (or system of nozzles on a common manifold), (b) a pumping device (or compressor, as may be the case), and (c Jan Entrained Substance accumulation or separation and condensation unit that separates the collected stream into a purified stream of non-condensable (air) on the one hand, and a condensed phase on the other.
- the accumulation device as used in the present invention may be solid adsorbent(s), liquid absorbent(s), liquid wash or a filter and dust bin.
- Figure 2 illustrates in a schematic form the system of the present invention, applied, as an example to vapor conservation and recovery from a Vapor Degreasing Bath, which comprises:
- a collection system consisting of a suction nozzle (a) and a pump (b).
- a primary separation system including a cooler/condenser/separator.
- a heat-mass-exchange unit comprising a heater (e), a desorption unit (g) and an adsorption unit (i) which are provided with a cooler and separator (h).
- Figure 3 illustrates in a schematic form the system of the present invention, applied, as an example, to vapor recovery from a manufacturing plant, which may or may not be itself contained in a Permanent Total Enclosure.
- the vapor separation unit is based on low temperature condensation, preceded by a membrane dryer to prevent ice formation and followed by a finishing step purifying the gaseous effluent to specification.
- An important element of the present invention is the collection method of the respective vapors, which can be characterized by two main requirements: (a) The location and direction of the suction orifices create a mass convection vector, which opposes the natural convection of the vapors towards the surrounding, thus preventing the diffusion of the vapors through the dilute layers of air or gas, which separate the bulk of the emanating vapors from the surrounding atmosphere, and
- the suction orifices will be located between the vapor source and the open air, at a distance in the range of about 0 to 50 cm from the source, the exact location depending on the geometry of the surroundings, the nature of the Entrained Substance and the rate of its emanation.
- the orifices position should, if possible, avoid obstructing the access to the working space.
- the orifices may be made to swivel and retract upon touch.
- the opening of the suction pipe must be directed away from the source of the emanating Entrained Substance and towards the open space. This creates the necessary bulk convection field that will balance out the natural tendency of the Entrained Substance to flow outward. Directing the suction pipe otherwise would subvert the purpose of preventing the Entrained Substance from reaching the surrounding open space. For example, consider directing the suction pipe downward toward the upper surface of a liquid solvent in a container as is done in US Patent Number 5,565,070.
- the suction capacity may be expressed by the sum of the source Entrained Substance rate plus the natural convection and diffusion across the air layer, which separates the source from the ambient air. As an approximation, it could be illustrated by the following formula: Q > QV + D A B X Aavg x C/ L (1 ) wherein:
- Q is the suction capacity, expressed in cm 3 /sec.
- Q v is the rate of emanation of the Entrained Substance at the source, expressed in cm 3 /sec.
- D AB is the binary diffusion coefficient of the Entrained Substance , across the air layer B, expressed in cm 2 /sec.
- a avg is the cross section for diffusion, as an average over the travelling distance of the Entrained Substance from the source to the surrounding air expressed in cm 2 (the cross section of the stack when it exists or the shell of a sphere when emanating in open air).
- C is the concentration of the Entrained Substance at the source expressed in mole fraction.
- L is the distance in cm. from the source to the surrounding free air, where the concentration is very small as compared to C.
- the purification step following the primary/condensation/phase-separation step can be performed by means of a well-known gas purification method, such as HME, or membrane separation, or conventional adsorption, or absorption, etc.
- HME gas purification method
- the HME method is the preferred method since it does not necessitate the expulsion of a relatively concentrated side stream, as do most other purification methods.
- a side stream will be produced, which it will be necessary to recycle, the consequence being an increase in the amount of gas-vapor mixture that must be processed.
- the recovery system in our example has been applied to a typical small vapor degreaser using Trifluorochloroethylene solvent to degrease electronic boards. It has a cross section of 50 x 35 cm and a neck depth of 60 cm from the open top of the bath to the highest liquid solvent level in it.
- the parts to be washed are generally, inserted from the top of the equipment manually, or by means of a robot. This implies that the top lid must be open during operation causing a substantial loss of solvent vapors to the atmosphere.
- the parts are first dipped into a liquid wash section, and then they are hanged for a while within a vapor wash space before being removed.
- the bath is normally equipped with cooling coils around its neck to condense some of the emanating vapors thereby reducing losses.
- this is not very efficient because the cooling can not reach the interior vapor space and the coils temperature may not be reduced much below freezing temperature because atmospheric moisture would soon solidify on the coils surface.
- the recovery system consists of:
- a HME unit consisting of a pair of periodically switched adsorbent beds, each containing one liter of active carbon.
- the first bed desorbing the previously adsorbed solvent vapors, thereby enriching the stream and thus facilitating the condensation of the solvent vapors in (h) the secondary cooler-condenser at -20°C followed by liquid separation. Finally, the vapor-laden gas exiting the secondary separator is returned to (i) the second adsorbent bed of the HME unit, where the final purification takes place, thus releasing
- a system essentially as described in figure 3 is installed to replace the original suction hood and stack.
- the system consists of the following items:
- a leak develops at an externally accessible point on a tank containing a liquefied Volatile Organic Compound, or at some non-ducted point on the piping servicing the tank, say a relief valve or a bursting disk.
- a transportable Vapor Recovery System essentially as depicted in Figure 1 , is brought to the site. It is equipped with a set of nozzles on a manifold that is connected by means of a flexible pipe to the pumping device and recovery unit. The suction nozzles system is applied to the leak and the Vapor Recovery Unit is operated for as long as needed until maintenance becomes possible.
- a Road Tanker overturns in an accident on the road, spilling a valuable or hazardous liquefied Volatile Organic Compound over the road surface.
- a transportable Vapor Recovery System essentially as depicted in Figure 1 , is brought to the site. It is equipped with a set of nozzles on a planar manifold that is connected by means of a flexible pipe to the pumping device and recovery unit. The planar manifold and nozzles system is spread over the spill and the Vapor Recovery Unit is operated for as long as needed until some other, more appropriate, containment method becomes preferable.
- a similar device may be applied to a barbecue stove, thus providing a solution to a problem that has been largely ignored in the past.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU15744/99A AU1574499A (en) | 1998-01-14 | 1998-12-15 | A system for preventing the emanation of vapors, odors, smoke and dusts in open spaces |
EP98960064A EP0971784A1 (en) | 1998-01-14 | 1998-12-15 | A system for preventing the emanation of vapors, odors, smoke and dusts in open spaces |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IL122934 | 1998-01-14 | ||
IL12293498A IL122934A0 (en) | 1998-01-14 | 1998-01-14 | A system for the recovery of vapors from open spaces |
IL126862 | 1998-11-02 | ||
IL12686298A IL126862A0 (en) | 1998-01-14 | 1998-11-02 | A system for collecting smoke or odors from open spaces |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999036157A1 true WO1999036157A1 (en) | 1999-07-22 |
Family
ID=26323578
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IL1998/000607 WO1999036157A1 (en) | 1998-01-14 | 1998-12-15 | A system for preventing the emanation of vapors, odors, smoke and dusts in open spaces |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0971784A1 (en) |
AU (1) | AU1574499A (en) |
IL (1) | IL126862A0 (en) |
WO (1) | WO1999036157A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1038992A1 (en) * | 1999-03-24 | 2000-09-27 | WOLF GmbH | Process and apparatus for surface treatment of parts with a solvent |
CN108310930A (en) * | 2018-02-05 | 2018-07-24 | 营创三征(营口)精细化工有限公司 | A kind of Cyanuric Chloride is sublimated crystallization offgas process for reclaiming |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3551189A (en) * | 1965-01-15 | 1970-12-29 | Du Pont | Solvent recovery process and apparatus |
US3768232A (en) * | 1972-01-06 | 1973-10-30 | Republic Corp | Solvent recovery system |
US3972201A (en) * | 1975-01-29 | 1976-08-03 | Process Products, Inc. | Vapor recovery system |
US4421532A (en) * | 1980-08-08 | 1983-12-20 | Massimo Sacchetti | Process for removing and recovering volatile organic substances from industrial waste gases |
US4995890A (en) * | 1988-01-27 | 1991-02-26 | Croudace Holdings Pty. Ltd. | Storage terminal vapor emission control system |
US5147418A (en) * | 1991-12-19 | 1992-09-15 | Chicago Bridge & Iron Technical Services Company | Volatile liquid storage system |
US5542965A (en) * | 1993-11-18 | 1996-08-06 | U.E. Sebald Druck Und Verlag Gmbh | Process and installation for removing solvent vapor from exhaust air |
US5565070A (en) * | 1994-08-09 | 1996-10-15 | Morikawa Industries Corporation | Solvent vapor sucking method and solvent recovering apparatus |
US5658369A (en) * | 1994-06-20 | 1997-08-19 | The Boc Group Plc | Recovery of substances from exhaust streams |
US5779768A (en) * | 1996-03-19 | 1998-07-14 | Air Products And Chemicals, Inc. | Recovery of volatile organic compounds from gas streams |
-
1998
- 1998-11-02 IL IL12686298A patent/IL126862A0/en unknown
- 1998-12-15 AU AU15744/99A patent/AU1574499A/en not_active Abandoned
- 1998-12-15 EP EP98960064A patent/EP0971784A1/en not_active Withdrawn
- 1998-12-15 WO PCT/IL1998/000607 patent/WO1999036157A1/en not_active Application Discontinuation
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3551189A (en) * | 1965-01-15 | 1970-12-29 | Du Pont | Solvent recovery process and apparatus |
US3768232A (en) * | 1972-01-06 | 1973-10-30 | Republic Corp | Solvent recovery system |
US3972201A (en) * | 1975-01-29 | 1976-08-03 | Process Products, Inc. | Vapor recovery system |
US4421532A (en) * | 1980-08-08 | 1983-12-20 | Massimo Sacchetti | Process for removing and recovering volatile organic substances from industrial waste gases |
US4995890A (en) * | 1988-01-27 | 1991-02-26 | Croudace Holdings Pty. Ltd. | Storage terminal vapor emission control system |
US5147418A (en) * | 1991-12-19 | 1992-09-15 | Chicago Bridge & Iron Technical Services Company | Volatile liquid storage system |
US5542965A (en) * | 1993-11-18 | 1996-08-06 | U.E. Sebald Druck Und Verlag Gmbh | Process and installation for removing solvent vapor from exhaust air |
US5658369A (en) * | 1994-06-20 | 1997-08-19 | The Boc Group Plc | Recovery of substances from exhaust streams |
US5565070A (en) * | 1994-08-09 | 1996-10-15 | Morikawa Industries Corporation | Solvent vapor sucking method and solvent recovering apparatus |
US5779768A (en) * | 1996-03-19 | 1998-07-14 | Air Products And Chemicals, Inc. | Recovery of volatile organic compounds from gas streams |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1038992A1 (en) * | 1999-03-24 | 2000-09-27 | WOLF GmbH | Process and apparatus for surface treatment of parts with a solvent |
CN108310930A (en) * | 2018-02-05 | 2018-07-24 | 营创三征(营口)精细化工有限公司 | A kind of Cyanuric Chloride is sublimated crystallization offgas process for reclaiming |
Also Published As
Publication number | Publication date |
---|---|
EP0971784A1 (en) | 2000-01-19 |
AU1574499A (en) | 1999-08-02 |
IL126862A0 (en) | 1999-09-22 |
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