Process for the preparation of percarboxylic acid solutions

US4059619A · kind A · utility

Assignees

• Deutsche Gold- und Silber-Scheideanstalt Vormals Roessler
• BAYER HEALTHCARE LLC · DE

Inventors

• Gunter Prescher · Hanau, DE
• Gerd Schreyer
• Otto Weiberg
• Rolf Wirthwein · Hanau, DE
• Helmut Waldmann · Leverkusen, DE
• Hermann Seifert · Bensberg, DE
• Wulf Schwerdtel
• Wolfgang Swodenk

Key dates

• Filing date: Apr 28, 1976
• Grant date: Nov 22, 1977
• Expiry date: Apr 28, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C407/003
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for continuous production of substantially anhydrous solutions of perpropionic acid in benzene. Aqueous hydrogen peroxide is first reacted with propionic acid in the presence of acid catalyst to form perpropionic acid and water (1). The perpropionic acid is extracted with benzene (5), to provide a benzene phase containing the perpropionic acid (11) and an aqueous raffinate (7). The benzene phase is subjected to an extraction with water (12) involving at least 3 stages, to remove hydrogen peroxide, and the resulting benzene extract (15) is subjected to azeotropic distillation (26) to provide the anhydrous solution (17). The aqueous raffinate, which contains hydrogen peroxide, is distilled to remove water (8) and the resulting concentrate is recycled (2) for use in the reaction (1).