Membrane for separation of water-alcohol mixed liquid and process for preparation thereof
US4983304A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Nov 16, 1989 |
| Grant date | Jan 8, 1991 |
| Priority date | — |
| Expiry date | Nov 16, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L5/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Disclosed is a membrane for the separation of a water-alcohol mixed liquid by the pervaporation method, which is composed of a chitosan having a molecular weight of 80,000 to 150,000 and a deacetylation degree adjusted to 80 to 95%. This separating membrane has an excellent selective permeability to water in the separation of a water-alcohol mixed liquid, and the mechanical strength of this separating membrane is very high. This separating membrane can be prepared by a process comprising dissolving a chitosan having a molecular weight of 80,000 to 150,000 and a deacetylation degree adjusted to 80 to 95% in an acidic aqueous solution to form a dope having a chitosan concentration of 9 to 12% by weight, shaping the dope into a membrane and immersing the membrane in an alkaline solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.