C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
18/25
C08J 9/28 (2006.01) B01D 67/00 (2006.01) B01D 69/02 (2006.01) B01D 71/16 (2006.01)
Patent
CA 1250108
TITLE A METHOD OF MANUFACTURING A CELLULOSE ACETATE MEMBRANE AND THE MEMBRANE SO PRODUCED INVENTORS Bhupender Singh Minhas Takeshi Matsuura Srinivasa Sourirajan ABSTRACT OF DISCLOSURE A cellulose acetate membrane is provided, capable of separating gaseous hydrogen from a gaseous mixture of hydrogen and hydrocarbon, by casting a 0.02 to 0.05 cm cellulose acetate film into an atmosphere at 20 to 40°C and a relative humidity of 30 to 70%, from a casting solution at 0 to 20°C and comprising 10 to 20 wt % cellulose acetate, 60 to 80 wt % acetone, 0.5 to 2.0 wt % magnesium perchlorate, balance water, then evaporating the solvent to form a membrane from the film, then gelling the membrane in ice cold water, then shrinking the membrane at 60 to 90°C to produce a water wet membrane having an average pore radius less than 7 .ANG., then replacing the water in the membrane sequentially at the laboratory temperature (about 20 to 25°C) first with aqueous alcohol (isopropyl plus water) and secondly with nonaqueous alcohol (isopropyl), then replacing the alcohol in the membrane with a nonaqueous, readily volatile organic solvent (hexane), and finally evaporating the nonaqueous solvent at laboratory temperature (about 20 to 25°C) to produce a membrane having a pore radius in the range 1.5 to 5.0 .ANG. and a standard deviation in the range 0.5 to 5.5 .ANG., according to the definition of Gaussian normal distribution.
479633
Matsuura Takeshi
Minhas Bhupender S.
Sourirajan Srinivasa
National Research Council Of Canada
Szereszewski Juliusz M.sc.
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