Process for the simultaneous recovery of 4-hydroxy-diphenyl and

Details Process for the simultaneous recovery of 4-hydroxy-diphenyl and Process for the simultaneous recovery of 4-hydroxy-diphenyl and

1984-01-26

1985-08-27

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568753, C07C 3768, C07C 3784

Patent

active

045380074

ABSTRACT:
4-Hydroxydiphenyl (mono-OD) and 4,4'-dihydroxydiphenyl (DOD) are obtained simultaneously from a mixture which contains these two substances, if such a mixture is treated with an aqueous alkali, and the resulting solution and the solid phase formed are separated at a temperature from -28.degree. C. to +40.degree. C. and the solution and the solid phase are acidified separately in order to form the free mono-OD and DOD. Mono-OD and DOD can be present in the starting mixture in the free form or in the form of the alkali metal phenolates. After formation of the alkali metal phenolates, where this is required, the aqueous alkali still contains 1-15 mol of alkali metal hydroxide per mol of the diphenyl compounds. The concentration of alkali metal hydroxide should be 4-25% by weight, relative to the amount of water present. In this process, it is also possible to employ industrial mixtures of the alkali melts of the associated diphenyl-sulphonic acids.

REFERENCES:
patent: 1885176 (1932-11-01), Britton et al.
patent: 1887227 (1932-11-01), Britton et al.
patent: 3993700 (1976-11-01), Smith et al.
patent: 4366329 (1982-12-01), Raynolds
Chemical Abstracts, Band 92, No. 5,4., Feb. 1980, Seite 747, No. 41563d, Columbus, Ohio, USA and JP-A-79 112 844, (Sanko Kagaku K.K.), 4/09/1979.

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