Methods of purifying phosphoric acid

Details Methods of purifying phosphoric acid Methods of purifying phosphoric acid

1998-01-02

1999-08-31

Langel, Wayne

Liquid purification or separation

Processes

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

210651, 4233211, C01B 2516, B01D 6100

Patent

active

059450002

ABSTRACT:
In one aspect, the invention includes a method of purifying phosphoric acid comprising filtering a feed solution of phosphoric acid through a membrane, wherein the feed solution is maintained at a temperature of from about 30.degree. F. to about 90.degree. F. during the filtering. In another aspect, the invention includes a method of purifying phosphoric acid comprising: a) providing a feed solution of phosphoric acid, said feed solution comprising greater than 17,000 ppm on a 100% P.sub.2 O.sub.5 basis of each of Al, Fe and Mg; and b) filtering the feed solution through a polyamide filter configured for nanofiltration, the filtering comprising a temperature of from about 30.degree. F. to 90.degree. F., and a pressure of from about 600 psig to about 1000 psig to form a purified phosphoric acid solution, the purified phosphoric acid solution comprising less than 1700 ppm on a 100% P.sub.2 O.sub.5 basis of each of Al, Fe and Mg.

REFERENCES:
patent: 4769148 (1988-09-01), Fibiger et al.
patent: 4857211 (1989-08-01), Nineuil et al.
patent: 5154829 (1992-10-01), Degen et al.
patent: 5318707 (1994-06-01), Rey et al.
patent: 5547579 (1996-08-01), Brown
patent: 5587083 (1996-12-01), Twardowski
patent: 5685990 (1997-11-01), Saugmann et al.
patent: 5693231 (1997-12-01), Johnson et al.

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