Membrane for separation of water-alcohol mixed liquid and proces

Details Membrane for separation of water-alcohol mixed liquid and proces Membrane for separation of water-alcohol mixed liquid and proces

1989-11-16

1991-01-08

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

21050028, B01D 7108

Patent

active

049833049

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.

REFERENCES:
patent: 4808313 (1989-02-01), Michizuki et al.

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