Process for the preparation of a bisphenol bischlorocarbonic acid ester

US3959335A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hugo Vernaleken · Walsrode, DE
• Kurt Weirauch
• Gunther Lenz
• Uwe Hucks · Alpen, DE

Key dates

• Filing date: Mar 4, 1975
• Grant date: May 25, 1976
• Expiry date: Mar 4, 1995

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/04
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A continuous process for the production of a bisphenol bischlorocarbonic acid ester wherein an aqueous solution of a dialkali metal salt of a hydroquinone or a bisphenol is reacted in a pump circulating system with 2.5 to 5.0 mol, per mol of dihydroxy compound of phosgene dissolved in a suitable solvent for the bischlorocarbonic acid ester formed in the reaction under the addition of an alkali metal hydroxide solution to keep the pH-value between 9.0 and 12.0, the organic phase obtained is separated wherefrom the bisphenol bischlorocarbonic acid ester is isolated by distillation and/or crystallisation.