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1. (WO2018205244) PROCESS FOR THE EPOXIDATION OF PROPENE

Pub. No.:    WO/2018/205244    International Application No.:    PCT/CN2017/084080
Publication Date: Fri Nov 16 00:59:59 CET 2018 International Filing Date: Sat May 13 01:59:59 CEST 2017
IPC: C07D 301/12
C07D 303/04
Applicants: EVONIK DEGUSSA GMBH
thyssenkrupp Industrial Solutions AG
Inventors: WANG, Zhijun
PASCALY, Matthias
BERNHARD, Maik
Title: PROCESS FOR THE EPOXIDATION OF PROPENE
Abstract:
In a process for the epoxidation of propene by reacting propene with hydrogen peroxide in the presence of a methanol solvent and a titanium zeolite epoxidation catalyst, the steps of: separating from the reaction mixture a crude propene oxide and a solvent mixture comprising methanol, water and peroxides; subjecting the solvent mixture to a catalytic hydrogenation for hydrogenating peroxides, providing a hydrogenated solvent mixture comprising from 1 to 1000 mg/kg of acetaldehyde; separating the hydrogenated solvent in at least one distillation stage, adding an acid to the hydrogenated solvent mixture or to at least one distillation stage, providing a recovered methanol as an overhead product; passing the recovered methanol through a bed of an acidic ion exchange resin, providing a treated methanol; and recycling the treated methanol to the epoxidation reaction prevent deactivation of the epoxidation catalyst by recycling acetaldehyde with the methanol.