Process for the epoxidation of propene

US10399952B2 · kind B2 · utility

Assignees

• EVONIK DEGUSSA GMBH · DE
• THYSSENKRUPP INDUSTRIAL SOLUTIONS AG · DE

Inventors

• Wolfgang Wöll · Maintal, DE
• Marc Brendel · Bruchköbel, DE
• Bernd Jaeger · Emmelshausen, DE
• Niels Bredemeyer · Waltrop, DE
• Bärbel Kolbe · Witten, DE
• Norbert Ullrich · Essen, DE
• Maik Bernhard · Bärnsdorf, DE

Key dates

• Filing date: Mar 10, 2017
• Grant date: Sep 3, 2019
• Expiry date: Mar 10, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D301/36
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

During start-up of a continuous epoxidation of propene with hydrogen peroxide in a methanol solvent with a shaped titanium silicalite catalyst in a tube bundle reactor with a cooling jacket, cooling medium is fed at the rate for full load of the reactor with a constant entry temperature of from 20° C. to 50° C., methanol solvent is fed at a rate of from 50 to 100% for full load of the reactor, hydrogen peroxide is fed at a rate that starts with no more than 10% of the rate for full load and is increased continuously or stepwise to maintain a maximum temperature in the fixed bed of no more than 60° C. and a difference between the maximum temperature in the fixed bed and the cooling medium entry temperature of no more than 20° C., and propene is fed at a rate of from 20 to 100% of the rate for full load, increasing the feeding rate when the molar ratio of propene to hydrogen peroxide reaches the molar ratio for full load.