Process for the preparation of organic solutions of percarboxylic acids

US4088676A · kind A · utility

Assignees

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

Inventors

• Willi Hofen · Rodenbach, DE
• Gunter Prescher · Hanau, DE
• Gerd Siekmann · Cologne, DE
• Gunter Wolf · Glückstadt, DE

Key dates

• Filing date: Apr 28, 1976
• Grant date: May 9, 1978
• Expiry date: Apr 28, 1996

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S203/06
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the continuous preparation of organic solutions of percarboxylic acids by reaction of an aqueous solution of hydrogen peroxide with the corresponding carboxylic acid in the presence of an acid, water-soluble catalyst which boils above 160.degree. C., extraction of the percarboxylic acid from the resulting reaction mixture using an organic solvent which is immiscible with water, reconcentration of the raffinate, which essentially contains hydrogen peroxide and the acid catalyst, by distilling off water in a distillation column and recycle of the raffinate, concentrated in this way, into the reaction with the carboxylic acid. The raffinate is divided into two partial streams in a ratio of 1 to 25:1. The raffinate is fed to a distillation column which is operated under reduced pressure and which has at least two take-off weirs as tray inserts, the first take-off weir being at least two theoretical plates above the sump phase, the second take-off weir being arranged at least two theoretical plates above the first take-off weir and the section of column between the second take-off weir and the top of the column having at least two theoretical plates. The larger partial str…