Process for recovering organic vapors from air
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IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-053/22
출원번호
US-0636474
(1984-07-31)
발명자
/ 주소
Baker, Richard W.
출원인 / 주소
Membrane Technology and Research, Inc.
대리인 / 주소
Sughrue, Mion, Zinn, Macpeak and Seas
인용정보
피인용 횟수 :
50인용 특허 :
6
초록▼
A process for recovering and concentrating organic vapor from a feed stream of air having an organic vapor content of no more than 20,000 ppm by volume. A thin semipermeable membrane is provided which has a feed side and a permeate side, a selectivity for organic vapor over air of at least 50, as me
A process for recovering and concentrating organic vapor from a feed stream of air having an organic vapor content of no more than 20,000 ppm by volume. A thin semipermeable membrane is provided which has a feed side and a permeate side, a selectivity for organic vapor over air of at least 50, as measured by the ratio of organic vapor permeability to nitrogen permeability, and a permeability of organic vapor of at least 3×10 -7 cm 3 (STP) cm/cm 2 sec.cm Hg. The feed stream is passed across the feed side of the thin semipermeable membrane while providing a pressure on the permeate side which is lower than the feed side by creating a partial vacuum on the permeate side so that organic vapor passes preferentially through the membrane to form an organic vapor depleted air stream on the feed side and an organic vapor enriched stream on the permeate side. The organic vapor which has passed through the membrane is compressed and condensed to recover the vapor as a liquid.
대표청구항▼
1. A process for recovering and concentrating organic vapor from a feed stream of air having an organic vapor content of no more than 20,000 ppm by volume, comprising: providing a thin semipermeable membrane having a feed side and a permeate side, a selectivity for organic vapor over air of at le
1. A process for recovering and concentrating organic vapor from a feed stream of air having an organic vapor content of no more than 20,000 ppm by volume, comprising: providing a thin semipermeable membrane having a feed side and a permeate side, a selectivity for organic vapor over air of at least 50, as measured by the ratio of organic vapor permeability to nitrogen permeability, and a permeability of organic vapor of at least 3×10 -7 cm 3 (STP) cm/cm 2 sec·cm Hg, passing the feed stream across the feed side of the thin semipermeable membrane while providing a pressure on the permeate side which is lower than the feed side by creating a partial vacuum on the permeate side such that organic vapor passes preferentially through the membrane to form an organic vapor depleted air stream on the feed side and an organic vapor enriched stream on the permeate side, and compressing and condensing the organic vapor which has passed through the membrane to recover the vapor as a liquid. 2. Process according to claim 1, wherein the thin semipermeable membrane is a rubbery material under the conditions of organic vapor composition of the feed stream and temperature of the feed stream. 3. Process according to claim 2, wherein the semipermeable membrane has a glass transition temperature (Tg) at least 20° C. below the temperature of the feed stream. 4. Process according to claim 1, wherein the vapor-depleted air stream is recirculated. 5. Process according to claim 4, wherein the feed stream has a temperature of at least 50° C. 6. Process according to claim 4, wherein the feed stream has a temperature of at least 100° C. 7. Process according to claim 1, wherein the feed stream has a vapor content of from 0.1 to 1 volume %. 8. Process according to claim 1, wherein the selectivity of the membrane is between 100 and 10,000. 9. Process according to claim 1, wherein the permeability of the membrane to organic vapor is above 1×10 -6 cm 3 (STP) cm/cm 2 sec·cm Hg. 10. Process according to claim 1, wherein the thin semipermeable membrane is provided as part of a composite membrane comprising a microporous membrane support layer and the thin semipermeable membrane is in the form of a barrier coating layer on the support. 11. Process according to claim 9, wherein the support membrane comprises an organic solvent resistant ultrafiltration membrane. 12. Process according to claim 1, wherein the total pressure on the product side is from 0.2 to 2 cm Hg and the total pressure on the feed side is from 80 to 100 cm Hg. 13. Process according to claim 1, wherein the organic vapor is a naptha, chlorinated hydrocarbon, acetone, ethanol, or methanol. 14. Process according to claim 1, wherein the organic vapor is perchloroethylene or trichloroethane. 15. Process according to claim 1, wherein the concentration of vapor in the organic vapor enriched stream on the permeate side is from 10 to 95 volume percent. 16. Process according to claim 1, wherein the concentration of vapor in the organic vapor enriched stream on the permeate side is from 10 to 70 volume percent.
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이 특허에 인용된 특허 (6)
Matson Stephen L. (Bend OR), Energy-efficient process for the stripping of gases from liquids.
Peretti Steven William ; Thomas Stuart Marc ; Shepherd ; Jr. Robert Donald, Bioreactor process for the continuous removal of organic compounds from a vapor phase process stream.
Baker, Richard W.; Pinnau, Ingo; He, Zhenjie; Da Costa, Andre R.; Daniels, Ramin; Amo, Karl D.; Wijmans, Johannes G., Gas separation using organic-vapor-resistant membranes in conjunction with organic-vapor-selective membranes.
Baker Richard W. (Palo Alto CA) Bell Carl-Martin (Stuttgart CA DEX) Wijmans Johannes G. (Menlo Park CA) Ahlers Bernd (Varel DEX), Membrane process for treatment of fluorinated hydrocarbon-laden gas streams.
Behling Dieter (Hamburg DEX) Hattenbach Karl (Geesthacht DEX) Ohlrogge Klaus (Geesthacht DEX) Peinemann Klaus-Victor (Reinbek DEX) Wind Jan (Barsbttel DEX), Method of removing organic compounds from air/permanent gas mixtures.
Friesen Dwayne T. (Bend OR) Newbold David D. (Bend OR) McCray Scott B. (Bend OR) Ray Roderick J. (Bend OR), Organic and inorganic vapor permeation by countercurrent condensable sweep.
Baker Richard W. (Palo Alto CA) Kaschemekat Jrgen (Palo Alto CA) Wijmans Johannes G. (Menlo Park CA) Kamaruddin Henky D. (San Francisco CA), Process for removing an organic compound from water.
Vara Tomas E. (Vero Beach FL) Mestemaker Jerry L. (Vero Beach FL) Thakker B. R. (Vero Beach FL), Process for removing halogenated hydrocarbons and other solvents from a solvent laden air (SLA) stream.
Vara Tomas E. (Vero Beach FL) Anderson Clyde (Vero Beach FL), Process for removing solvents and other contaminants from an inlet solvent laden air path.
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