Gas separation: processes – Selective diffusion of gases – Selective diffusion of gases through substantially solid...
Patent
1995-02-10
1998-11-17
Spitzer, Robert
Gas separation: processes
Selective diffusion of gases
Selective diffusion of gases through substantially solid...
95 47, 95 50, 95 52, 95 54, 96 13, 96 14, B01D 5322
Patent
active
058370323
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a method of separating a gas mixture employing a membrane having a discriminating layer or region of a glassy polymer operated at sub-ambient temperatures. This invention also relates to apparatus for such method.
The use of membranes to separate various components of gas mixtures is known. Membranes have been used to separate, remove, purify, or partially recover a variety of gases, including hydrogen, helium, oxygen, nitrogen, argon, carbon monoxide, carbon dioxide, ammmonia, water vapor, methane and other light hydrocarbons.
Membrane separations are based on the relative permeability of two or more component gases through the membrane. To separate a gas mixture into two portions, one richer and one leaner in at least one component gas, the gas mixture is brought into contact with one side of the membrane through which at least one of the component gases selectively permeates. A component gas which selectively permeates through the membrane passes through the membrane more readily than at least one other component gas of the gas mixture. The gas mixture is thereby separated into a stream which is enriched in the selectively permeating component gas or component gases and a stream which is depleted in the selectively permeating component gas or component gases. A relatively non-permeating component gas passes less readily through the membrane than at least one other component gas of the gas mixture. An appropriate membrane material is chosen so that some degree of separation of the gas mixture can be achieved.
D. W. Brubaker et al., Industrial and Engineering Chemistry, Vol. 46, pp. 1465-1473 (1953), disclose gas permeation through various films and parameters which affect such permeation. R. W. Roberts, Journal of Applied Polymer Science, Vol. 7, No. 6, pp. 2183-2197 (1963), examined the effect of temperature on permeation through a variety of polymer films.
S. Srinivasan, at the Gordon Research Conference on Synthetic Membranes on Jul. 10, 1990, presented a paper entitled "An Extraordinary Polymeric Membrane That Rejects Light Gases" which reported permeability data on a polytrimethylsilyl propyne membrane at temperatures down to -40.degree. C. for nitrogen and carbon dioxide. Anomalous mixed gas effects were observed. These effects were explained by suggesting that the transport in this material was dominated by diffusion in pores and on the surfaces of those pores, rather than the traditional solution-diffusion mechanism. Thorogood, at the International Gas Separation Meeting held in Austin, Tex. on Apr. 23, 1991, reported permeability data for oxygen and nitrogen at low temperatures using a modified dense glassy film of polytrimethylsilyl propyne. See also, S. R. Auvil et al., Book of Abstracts, The Fourth Chemical Congress of North America, Aug. 25-30, 1991, Item 119.
D. J. Moll et al., at the First Annual National Meeting of the North American Membrane Society on Jun. 3-5, 1987, disclosed permeation data for helium, argon, and xenon using films of tetramethyl bisphenol A polycarbonate over a wide temperature range.
D. J. Moll et al., at the Gordon Research Conference on Reverse Osmosis, Ultrafiltration, and Gas Separation on Jul. 31, 1989, disclosed permeability data for hydrogen and deuterium using a film of bisphenol A polycarbonate at temperatures down to -125.degree. C.
In general, the gas permeability of known membrane materials decreases with decreasing temperature. Generally, the prior art has recommended that membrane separations be conducted at temperatures such that good physical properties of the membrane are maintained and condensation of the gaseous components to be separated is avoided. Typically, the temperature is maintained as high as possible without deleterious effects on the physical integrity or performance of the membrane, since higher temperatures generally increase the rate of gas permeation through the membrane. Temperatures in the range from 20.degree. C. to 40.degree. C. are generally employed in prior art separations
REFERENCES:
patent: 1831644 (1931-11-01), St. Adiar et al.
patent: 2497421 (1950-02-01), Shiras
patent: 3246449 (1966-04-01), Stern et al.
patent: 3246450 (1966-04-01), Stern et al.
patent: 3781378 (1973-12-01), Kantor et al.
patent: 3899309 (1975-08-01), Hoehn et al.
patent: 3989478 (1976-11-01), Jones
patent: 4285917 (1981-08-01), Knight
patent: 4392871 (1983-07-01), Almolof et al.
patent: 4522636 (1985-06-01), Markbreiter et al.
patent: 4545787 (1985-10-01), Hegarty
patent: 4548618 (1985-10-01), Linde et al.
patent: 4560394 (1985-12-01), McDonald et al.
patent: 4589896 (1986-05-01), Chen et al.
patent: 4595405 (1986-06-01), Agrawal et al.
patent: 4598137 (1986-07-01), Guiver et al.
patent: 4602477 (1986-07-01), Lucadamo
patent: 4623704 (1986-11-01), Dembicki et al.
patent: 4639257 (1987-01-01), Duckett
patent: 4654047 (1987-03-01), Hopkins et al.
patent: 4654063 (1987-03-01), Auvil et al.
patent: 4687498 (1987-08-01), Maclean et al.
patent: 4701187 (1987-10-01), Choe et al.
patent: 4717393 (1988-01-01), Hayes
patent: 4717394 (1988-01-01), Hayes
patent: 4717407 (1988-01-01), Choe et al.
patent: 4732579 (1988-03-01), Veltman et al.
patent: 4732583 (1988-03-01), DeLong et al.
patent: 4746474 (1988-05-01), Kohn
patent: 4749393 (1988-06-01), Rowles et al.
patent: 4781907 (1988-11-01), Mcneill
patent: 4793829 (1988-12-01), Pan et al.
patent: 4793832 (1988-12-01), Veltman et al.
patent: 4817392 (1989-04-01), Agrawal et al.
patent: 4818254 (1989-04-01), Anand et al.
patent: 4840646 (1989-06-01), Anand et al.
patent: 4851014 (1989-07-01), Jeanes
patent: 4874401 (1989-10-01), Jeanes
patent: 4880699 (1989-11-01), Kohn
patent: 4881953 (1989-11-01), Prasad et al.
patent: 4892564 (1990-01-01), Cooley
patent: 4897092 (1990-01-01), Burgoyne et al.
patent: 4929405 (1990-05-01), Kohn
patent: 4944775 (1990-07-01), Hayes
patent: 4948400 (1990-08-01), Yamada et al.
patent: 4952219 (1990-08-01), DiMartino, Sr.
patent: 4968331 (1990-11-01), Sakashita et al.
patent: 4971695 (1990-11-01), Kawakami et al.
patent: 4978573 (1990-12-01), Kohn
patent: 4988371 (1991-01-01), Jeanes et al.
patent: 4994095 (1991-02-01), Kawakami et al.
patent: 5000763 (1991-03-01), Sanders, Jr. et al.
patent: 5007945 (1991-04-01), Tien et al.
patent: 5009679 (1991-04-01), Angus et al.
patent: 5013332 (1991-05-01), Surnamer et al.
patent: 5015269 (1991-05-01), Garrett et al.
patent: 5034026 (1991-07-01), Summers et al.
patent: 5034027 (1991-07-01), Tien et al.
patent: 5035727 (1991-07-01), Chen
patent: 5041149 (1991-08-01), Handley
patent: 5042992 (1991-08-01), Blinka et al.
patent: 5049169 (1991-09-01), Teramoto et al.
patent: 5055616 (1991-10-01), Burgoyne et al.
patent: 5082481 (1992-01-01), Barchas et al.
patent: 5086623 (1992-02-01), Gauthier
patent: 5116504 (1992-05-01), Sakashita et al.
patent: 5151022 (1992-09-01), Emerson et al.
patent: 5409525 (1995-04-01), Kazama et al.
patent: 5520809 (1996-05-01), Teramota
S. Srinivasan, Gordon Research Conference on Synthetic Membranes, Jul. 10, 1990, "An Extraordinary Membrane That Rejects Light Gases".
Thorogood, International Gas Separation Meeting, Austin, TX., Apr. 23, 1991.
S. R. Auvil et al., Book of Abstracts, The Fourth Chemical Congress of North America, Aug. 25-30, 1991, Item 119.
K. K. Hsu et al., AICHE Conference, Nov. 18, 1991.
D.J. Moll et al, First Annual National Meeting of the North American Membrane Society, Jun. 3-5, 1987.
D.J. Moll et al., Gordon Research Conference on Reverse Osmosis Ultrafiltration, and Gas Separation, Jul. 31, 1989.
D. Parro, Energy Progress, vol. 5, No. 1, pp. 51-54, 1985.
D. Parro, Technology, Oil and Gas Journal, pp. 85-88, Sep. 24, 1984.
G. Cutler et al., Laurance Reid Gas Conditioning Conference, Mar. 4-6, 1985.
"Membranes in Gas Separation and Enrichment", Fourth Priestley Conference, Royal Society of Chemistry, pp. 342-350 (1986).
S.P. Chen et al., Polymer Engineering and Science, Vol. 20, No. 1, pp. 40-50, 1980.
S.G. Kimura et al., Journal of Membrane Science, vol. 29, pp. 69-77, 1986.
R.W. Roberts et al., Jo
Bales Stephen E.
Beck Henry N.
Burmester Alan F.
Clark James E.
Hotz Charles Z.
Spitzer Robert
The Cynara Company
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