The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 22, 1977
Filed:
Apr. 28, 1976
Gunter Prescher, Hanau, DT;
Gerd Schreyer, Hanau, DT;
Otto Weiberg, Neu-Isenburg, DT;
Rolf Wirthwein, Hanau, DT;
Helmut Waldmann, Leverkusen, DT;
Hermann Seifert, Cologne, DT;
Wulf Schwerdtel, Leverkusen, DT;
Wolfgang Swodenk, Odenthal, DT;
Deutsche Gold-und Silber-Scheideanstalt Vormals Roessler, Frankfurt am Main, DT;
Bayer Aktiengesellschaft, Leverkusen, DT;
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).