Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1990-06-29
1992-03-17
Spitzer, Robert
Gas separation
Means within gas stream for conducting concentrate to collector
55 68, 55 70, 55158, B01D 5322, B01D 7118
Patent
active
050964682
ABSTRACT:
High performance cellulose acetate butyrate gas separation membranes are prepared from a casting solution containing from about 10 to 30 percent polymer, 35 to 70 percent solvent, and 15 to 30 percent pore-forming agents. A film casting solution is cast onto a substantially flat support surface and a dense layer is formed on the exposed film surface. The film is gelled, washed, and dried to produce a particularly useful gas separation membrane. The cellulose acetate polymers used in this preparation have molecular weights of at least about 20,000, and have about 10 to about 45% butyryl groups, about 2 to about 35% acetyl groups, and about 0.8 to about 2 percent hydroxyl groups, by weight. The membranes may be used for separating a feed gas into a permeate fraction and a residual fraction, and are particularly useful for separating gases in the purge gas stream of ammonia plants to recover a permeate which is relatively rich in hydrogen. Cellulose acetate butyrate membranes may be used to improve the separation of ammonia plant purge gases which contain ammonia as well as hydrogen and nitrogen, especially when there is no pretreatment of the purge gas to remove ammonia gas.
REFERENCES:
patent: 3283042 (1966-11-01), Loeb et al.
patent: 3607329 (1971-09-01), Manjikian
patent: 3842515 (1974-10-01), MacDonald et al.
patent: 4080743 (1978-03-01), Mands
patent: 4080744 (1978-03-01), Manos
patent: 4127625 (1978-11-01), Arisaka et al.
patent: 4130403 (1978-12-01), Cooley et al.
patent: 4134742 (1979-01-01), Schell
patent: 4172885 (1979-10-01), Perry
patent: 4180552 (1979-12-01), Graham et al.
patent: 4180553 (1979-12-01), Null et al.
patent: 4210529 (1980-07-01), Petersen
patent: 4430807 (1984-02-01), Davis et al.
patent: 4527999 (1985-07-01), Lee
patent: 4681605 (1987-07-01), Gollan
patent: 4681713 (1987-07-01), Miyagi et al.
Eastman Chemicals Product Information; Publication No. E-146 H; Jun., 1984 (5 pp.).
Gardner et al., "Hollow Fiber Permeater for Separating Gases", CEP, Oct., 1977; pp. 76-78.
Knieriem; "Membrane Separation Saves Energy"; Hydrocarbon Processing, Jul. 1980, pp. 65-67.
Manjikian et al., "Characterization of Cellulose Acetate Butyrate Membranes"; Research & Development Progress Report No. 654; May 1971; pp. 1-110.
Mazur et al.; "Gas Separation Membranes-Now and Tomorrow"; Envirogenics Systems Co.; Jun. 1984; 32 pp.
Monsanto Sales Literature Cammonia Applications), 1981, 2 pp.
Schell et al.; "Membrane Applications to Coal Conversion Processes"; Envirogenics Systems Co.; U.S. Dept. of Commerce Intis; Oct. 1976, pp. 1-153.
Looper Valerie E.
Spitzer Robert
Trinker Steven T.
W. R. Grace & Co.,-Conn.
LandOfFree
Cellulose acetate butyrate gas separation membranes does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cellulose acetate butyrate gas separation membranes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cellulose acetate butyrate gas separation membranes will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1472679