Process for preparing anhydrous salts of dihydroxyaromatic compo

Details Process for preparing anhydrous salts of dihydroxyaromatic compo Process for preparing anhydrous salts of dihydroxyaromatic compo

1984-07-23

1985-10-08

Lone, Werren B.

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

Organic compounds

Oxygen containing

568716, 568722, 568753, 568763, C07C 3768

Patent

active

045462070

ABSTRACT:
Anhydrous di-(alkali metal) (especially disodium) salts of dihydroxyaromatic compounds such as bisphenol A are prepared by first contacting the solid dihydroxyaromatic compound with an aqueous alkali metal hydroxide solution so as to convert it into the solid di-(alkali metal) salt or hydrate thereof and subsequently separating the solid salt or hydrate from the aqueous system and removing water therefrom, typically by mixing the same with an organic liquid and removing water, including water of hydration, by evaporation. The organic liquid is preferably one such as toluene or o-dichlorobenzene in which water and the anhydrous di-(alkali metal) salt are substantially insoluble. The process may be operated in batch or continuous fashion.

REFERENCES:
patent: 2354012 (1944-07-01), Gump
patent: 3960968 (1976-06-01), Vernaleken et al.
patent: 4202993 (1980-05-01), Takekoshi
patent: 4221673 (1980-09-01), Robson et al.
patent: 4257953 (1981-03-01), Williams, III et al.
patent: 4302616 (1981-11-01), Williams, III et al.
patent: 4410735 (1983-10-01), Dellacoletta et al.
patent: 4467123 (1984-08-01), Mayer et al.

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