Membranes prepared via reaction of diazonium compounds or precursors
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United States of America Patent
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Mar 14, 1989
Issued Date -
N/A
app pub date -
Aug 10, 1987
filing date -
Jan 15, 1987
priority date (Note) -
Expired
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Abstract
An improved reverse osmosis membrane and process for making the same is described. The membrane is prepared by treating a polymer bearing primary amine groups with nitrous acid or a diazonium compound so as to react the resulting diazonium groups with other groups present. The resulting membrane possesses improved chlorine resistance. When the nitrous acid treatment is employed, the water flux of a polyamide membrane is frequently increased with little or no effect on the salt rejection of the membrane.
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