Method of improving membrane properties via reaction of diazoniu

Details Method of improving membrane properties via reaction of diazoniu Method of improving membrane properties via reaction of diazoniu

1988-12-19

1989-12-19

Spitzer, Robert

Liquid purification or separation

Processes

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

210654, 210655, 21050038, B01D 1300, C02F 144

Patent

active

048881163

ABSTRACT:
A method of improving the properties of a reverse osmosis membrane having a polyamide discriminating layer containing residual aromatic primary amine groups is described. In this method, the polyamide discriminating layer of the membrane is treated with an aqueous solution of a reagent which reacts with primary amine groups to form diazonium salt groups or derivatives of diazonium salt groups. This method results in a membrane possessing improved chlorine resistance. When nitrous acid is employed as the reagent in the treatment, the water flux of the polyamide membrane is frequently increased with little or no effect on the salt rejection of the membrane.

REFERENCES:
patent: 3551331 (1970-12-01), Cescon et al.
patent: 3721623 (1973-03-01), Stana
patent: 3806564 (1974-04-01), Riley et al.
patent: 3850797 (1974-11-01), Lyall
patent: 3951920 (1976-04-01), Senoo et al.
patent: 4005012 (1977-01-01), Wrasidlo
patent: 4080296 (1978-03-01), Clark
patent: 4087388 (1978-05-01), Jensen et al.
patent: 4259183 (1981-03-01), Cadotte
patent: 4277344 (1981-07-01), Cadotte
patent: 4340479 (1982-07-01), Pall
patent: 4340480 (1982-07-01), Pall et al.
patent: 4415455 (1983-11-01), Osei-Gyimah et al.
patent: 4472175 (1984-09-01), Malon et al.
patent: 4512893 (1985-04-01), Makino et al.
patent: 4520044 (1985-05-01), Sundet
patent: 4584103 (1986-04-01), Linder et al.
patent: 4601827 (1986-07-01), Buckfelder et al.
patent: 4605526 (1986-08-01), Reynhout et al.
patent: 4606943 (1986-08-01), Rak et al.
patent: 4626468 (1986-12-01), Sundet
patent: 4627992 (1986-12-01), Badenhop et al.
patent: 4661254 (1987-04-01), Zupancic et al.
patent: 4673504 (1987-06-01), Ostreicher et al.
patent: 4701186 (1987-10-01), Zampini
patent: 4704324 (1987-11-01), Davis et al.
patent: 4719062 (1988-01-01), Sundet
patent: 4812238 (1989-03-01), Cadotte et al.
Chemical Abstracts: 91:58115m; 93:27284c; 93:27283b; 99:124275g; 96:7408e; 92:182726w; 87:202397s; 91:153551j; 102:132956a; 86:51761g; 81:78952d; 77:102761f and 82:58953x.
The Condensed Chemical Dictionary, Tenth Edition, pp. 419, 476, Van Nostrand Reinhold Co. (1981).

Affiliated with

Also associated with

Rating

Method of improving membrane properties via reaction of diazoniu does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of improving membrane properties via reaction of diazoniu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of improving membrane properties via reaction of diazoniu will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1901207