Desalination reverse osmotic membranes and their preparation

Details Desalination reverse osmotic membranes and their preparation Desalination reverse osmotic membranes and their preparation

1977-03-16

1978-09-05

Spear, Jr., Frank A.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210500M, B01D 1300

Patent

active

041118103

ABSTRACT:
Semipermeable membranes useful in reverse osmosis and a process of preparing them comprising deacetylating naturally occurring chitin to produce chitosan, making a film of chitosan salt from an acid diluted aqueous solution of the chitosan, converting the film of chitosan salt to a film of chitosan having free amino groups by neutralizing the acid groups, and then subjecting the film of chitosan to a chemical treatment with an organic acid, by which to convert the chitosan to the acetylated form, having a degree of acetylation from about 0.3 to 0.8, to produce the reverse osmotic membranes.
The products have excellent chemical properties as well as mechanical strengths sufficient to withstand the pressure difference in the operating condition.

REFERENCES:
patent: 2040880 (1936-05-01), Rigby
patent: 2361000 (1944-10-01), Zender
patent: 3228876 (1966-01-01), Mahon

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