PURPOSE: To provide a hollow yarn membrane for sepn. of gas which has gas sepn. performance and gas permeation performance plus durability by forming cellulose ester having a specific pore size distribution into a hollow yarn-like film.
CONSTITUTION: This sepn. membrane has the pore size distribution wherein the pore size corresponding to the max. peak of the pore size distribution function determined by an isothermal curve of B.E.T. adsorption is ≤10. In an example, cellulose diacetate is dissolved in the mixed soln. of N-methly-2-pyrolidone and methoxy polyethylene glycol and the soln. is extruded from the spinning mouthpiece of double pipes; the extrudate is solidified in a solidifying bath kept at 10°C. The hollow yarn is treated for 20min in hot water at 85°C and is then treated for 20min in hot water at 91°C, whereafter the yarn is immersed in a soln. of sodium oleate and is then immersed stepwise in aq. soln. of isopropanol of 20, 50, 75, 100% concns. After the yarn is further immersed for 2hr in n- hexane, the yarn is vacuum-dried. The permeation rate of hydrogen of the obtained membrane is 8.1×10-5cc/cm2.sec.cmHg and the coefft. of sepn., for methane is 92.
HAMADA KAZUTO
MORINO MORIO
YOSHIDA SEIJI
FURUKAWA KAORU
| JPS53146274A | 1978-12-20 | |||
| JPS5289574A | 1977-07-27 | |||
| JPS51112917A | 1976-10-05 | |||
| JPS5138281A | 1976-03-30 | |||
| JPS5626526A | 1981-03-14 | |||
| JPS5194482A | 1976-08-19 | |||
| JPS5858111A | 1983-04-06 |
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