Method of separating acids from chemical reaction mixtures by means of apolar amines

US9493491B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Oliver Huttenloch · Ispringen, DE
• Patrick Deck · Mannheim, DE
• Holger Ganz · Ludwigshafen, DE
• Michael Mauss · Oldenburg, DE
• Wolfgang Körnig · Leimen, DE
• Michael Bock · Ruppertsberg, DE

Key dates

• Filing date: May 6, 2016
• Grant date: Nov 15, 2016
• Expiry date: May 6, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07B63/00
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the removal of acids from reaction mixtures, comprising at least one product of value which is sparingly soluble in water, by at least one unpolar amine as an auxiliary base, which includes: a) reacting the auxiliary base with the acid with formation of a salt; b) reacting the salt formed in step a) with a further base which accepts the acid with liberation of the auxiliary base and combines with the acid to be accepted from the auxiliary base to form a salt which is very readily soluble in water; c) extraction of the mixture obtained in step b) with water or an aqueous medium, wherein the salt of the further base dissolves in the aqueous phase and the product of value, or the solution of the product of value, in a suitable solvent and the auxiliary base form at least one separate nonaqueous phase; and d) removal by distillation of at least part of any solvent present from the at least one nonaqueous phase obtained in step c), to form two nonmiscible liquid phases.