Permselective membrane of polyacrylonitrile copolymer and proces

Details Permselective membrane of polyacrylonitrile copolymer and proces Permselective membrane of polyacrylonitrile copolymer and proces

1996-09-09

1998-01-13

Fortuna, Ana

Liquid purification or separation

Filter

Material

21050043, 210490, 210640, 96 4, B01D 3321

Patent

active

057075220

ABSTRACT:
A separatory membrane is provided which has a sufficient durability and shows a high rate of permeation therethrough and a high separation factor to a variety of organic substances and a wide range of concentration thereof in mutual separation of organic substances and separation of a water/organic substance mixture by pervaporation, vapor permeation or perstraction. The separatory membrane shows the performance that water permeates selectively through the membrane while satisfying such conditions that the product (QL) of the rate Q (kg/m.sup.2 .multidot.hr) of permeation and the thickness L (.mu.m) of the membrane is at least 0.5 kg.multidot..mu.m/m.sup.2 .multidot.hr and that the separation factor .alpha..gtoreq.10 and log.alpha..gtoreq.-1.77.times.log(QL)+2.77 when the pervaporation performance of a 5-30 .mu.m-thick dense uniform membrane is evaluated using as a liquid feed, an 80 wt. % aqueous solution of acetic acid at a temperature of 70.degree. C., and comprises, as the membrane material, a polyacrylonitrile copolymer constituted of 90 to 97 mol % of acrylonitrile monomer units and a specific comonomer(s).

REFERENCES:
patent: 4025439 (1977-05-01), Kamada et al.
patent: 4906379 (1990-03-01), Hodgins et al.
patent: 5039421 (1991-08-01), Linder et al.
patent: 5554292 (1996-09-01), Maeda et al.

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