Process for purifying crude p-aminophenol

Details Process for purifying crude p-aminophenol Process for purifying crude p-aminophenol

1978-03-13

1979-02-13

Douglas, Winston A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260705, C07C 8526

Patent

active

041395620

ABSTRACT:
A process for purifying crude p-aminophenol which contains 4,4'-diaminodiphenyl ether and other impurities, which process comprising adding an alkali metal compound to the crude p-aminophenol in an aqueous medium in an atmosphere of an inert gas and, if necessary, in the presence of a reducing agent to give an aqueous solution of an alkali metal salt of p-aminophenol, and contacting the aqueous solution with an inert organic solvent immiscible with water to permit 4,4'-diaminodiphenyl ether and other impurities to be separated by extraction in the solvent.

REFERENCES:
patent: 2446519 (1948-08-01), Bean
patent: 2464194 (1949-03-01), Zimmerman
patent: 3177256 (1965-04-01), Holtzclaw et al.
patent: 3301904 (1967-01-01), Cryer
patent: 3694508 (1972-09-01), Baron et al.
patent: 3703598 (1972-11-01), Baron
patent: 3717680 (1973-02-01), Baron et al.

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