Composite semipermeable membrane, process of producing the same

Details Composite semipermeable membrane, process of producing the same Composite semipermeable membrane, process of producing the same

1991-08-08

1993-01-12

Dawson, Robert A.

Liquid purification or separation

Processes

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

210653, 210654, 210490, 21050027, 21050038, 210506, 210900, B01D 6100, B01D 3900

Patent

active

051787660

ABSTRACT:
A composite semipermeable membrane which has a high electrolytes rejection even when the concentration of the electrolytes in feed water is very low and even if the pH of feed water is not less than 8 is disclosed. The composite semipermeable membrane of the present invention comprises a microporous substrate and a cross-linked polyamide-based ultra-thin membrane laminated on the microporous substrate, the ultra-thin membrane having a covalently bonded quaternary nitrogen atom.

REFERENCES:
patent: 4277344 (1981-07-01), Cadotte
patent: 4673504 (1987-06-01), Ostreicher et al.
patent: 4743418 (1988-05-01), Barnes, Jr. et al.
patent: 4927540 (1990-05-01), Wessling et al.
patent: 4960518 (1990-10-01), Cadotte et al.
patent: 5024765 (1991-06-01), Linder et al.
Derwent Abstracts C90-021269.
C89-138863.
C88-096371.
C88 033413.
C87-075449.
C87-013526.
C90-021268.
JPRO Abstracts 90.03.09 Sect. C, Section No. 699; vol. 14, No. 12, 6 p. 120.
89.12.13 Sect. C, Section No. 665; vol 13, No. 562, p. 36.
88.11.08 Sect. C, Section No. 541; vol. 12, No. 421, p. 10.
87.10.23 Sect. C, Section No. 454, vol. 11, No. 326 p. 18.
87.05.22 Sect. C, Section No. 423, vol. 11, No. 159, p. 30.
90.03.09 Sect. C, Section No. 699; vol. 14, No. 126, p. 120.

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