Use of inorganic ammonium cation salts to maintain the flux and

Details Use of inorganic ammonium cation salts to maintain the flux and Use of inorganic ammonium cation salts to maintain the flux and

1996-05-07

1997-08-19

Fortuna, Ana

Liquid purification or separation

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21050037, 210490, 264 451, 264 48, B01D 3900

Patent

active

056584601

ABSTRACT:
To prevent the deterioration of the flux and salt rejection characteristics of polyamide, thin-film, composite reverse osmosis membranes when subjected to relatively high temperature drying conditions, an unsubstituted inorganic ammonium cation salt of an acid is incorporated into the process of manufacture. The ammonium salt can be introduced into the process either before or after the membrane is formed by interfacial polymerization so long as it is added before the membrane is heated.

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patent: 4872984 (1989-10-01), Tomaschke
patent: 4888116 (1989-12-01), Cadotte et al.
patent: 4948507 (1990-08-01), Tomaschke
patent: 4983291 (1991-01-01), Chau et al.
patent: 5254261 (1993-10-01), Tomaschke et al.
patent: 5368889 (1994-11-01), Johnson et al.

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