Permselective membrane of polyacrylonitrile copolymer and process for producing the same
US5554292A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1993 |
| Grant date | Sep 10, 1996 |
| Priority date | — |
| Expiry date | Apr 5, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/76
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A separatory membrane is provided which has sufficient durability and shows a high rate of permeation therethrough, a high separation factor to a variety of organic substances having 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 that water permeates selectively through the membrane while satisfying such conditions that the product (QL) of the rate Q (kg/m.sup.2.hr) of permeation and the thickness L (.mu.m) of the membrane is at least 0.5 kg..mu.m/m.sup.2.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., comprises, as the membrane material, a polyacrylonitrile copolymer constituted of 90 to 97 mol % of acrylonitrile monomer units and a specific comonomer(s).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.