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Title:
PROCESS FOR THE EPOXIDATION OF PROPENE
Document Type and Number:
WIPO Patent Application WO/2018/205244
Kind Code:
A1
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.

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Inventors:
WANG ZHIJUN (CN)
PASCALY MATTHIAS (DE)
BERNHARD MAIK (DE)
Application Number:
PCT/CN2017/084080
Publication Date:
November 15, 2018
Filing Date:
May 12, 2017
Export Citation:
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Assignee:
EVONIK DEGUSSA GMBH (DE)
THYSSENKRUPP IND SOLUTIONS AG (DE)
International Classes:
C07D301/12; C07D303/04
Domestic Patent References:
WO2004048354A12004-06-10
WO2003093255A12003-11-13
WO2004048355A12004-06-10
WO2001057009A12001-08-09
WO1999007690A11999-02-18
WO2012048528A12012-04-19
WO2002085873A12002-10-31
Foreign References:
US5599955A1997-02-04
CN103172594A2013-06-26
EP0757043A11997-02-05
Attorney, Agent or Firm:
NTD PATENT AND TRADEMARK AGENCY LIMITED (CN)
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