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Title:
SEMIPERMEABLE MEMBRANE
Document Type and Number:
Japanese Patent JPS61401
Kind Code:
A
Abstract:

PURPOSE: To obtain a semipermeable membrane having good separation efficiency and excellent in permeability fitted to the separation of an org. substance according to an osmotic evaporation method, by using a crosslinked membrane obtained by reacting dextrin with isocyanate or epihalohydrin.

CONSTITUTION: After dextrin is dissolved in a solvent, isocyanate such as isophorone dissocyanate is added to the resulting solution to perform the urethanating of dextrin. Further, the epoxidation of dextrin is performed by epihalohydrin such as epichlorohydrin. The treated solution is applied to a porous support such as polyvinylidene fluoride film to obtain a semipermeable membrane. When the separation of water/ethyl alcohol is performed according to an osmotic evaporation method by using this membrane, water can be selectively permeated.


Inventors:
Murano, Masao
Fukuda, Koji
Takegami, Shinsuke
Konagaya, Juji
Application Number:
JP1984000120730
Publication Date:
January 06, 1986
Filing Date:
June 14, 1984
Export Citation:
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Assignee:
AGENCY OF IND SCIENCE & TECHNOL
International Classes:
B01D71/08; B01D71/34; (IPC1-7): B01D13/00; B01D13/04
Domestic Patent References:
JPS588505A
JPS5411080A
JPS60232210A