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Process for epoxidation of olefins

A technology of epoxidation and olefins, applied in the direction of organic chemistry, organic chemistry, etc., can solve the problem of low selectivity of propylene oxide

Inactive Publication Date: 2004-05-05
EVONIK OPERATIONS GMBH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although by taking said measures a hydrogen peroxide conversion of 98.4% could be achieved, the selectivity to propylene oxide of 80.3% is still too low for the industrial application of the process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and 2 and comparative example 1

[0038] Titanium-silicate catalysts were used in all examples. According to example 5 of EP 00 106 671.1, the titanium-silicate powder was formed into 2 mm extrudates using silica sol as binder. The H used was prepared as a 40% by weight aqueous solution according to the anthraquinone method 2 o 2 .

[0039] In a reaction tube with a diameter of 10 mm, a length of 4 m, and a volume of 300 ml, the epoxidation was carried out continuously in a downflow mode. In addition, an observation window was provided near the outlet of the reactor in order to confirm with the naked eye whether or not the two liquid phases as described above existed. Furthermore, the device consists of three containers for liquids and corresponding pumps and liquid separation containers. Methanol, 40% H 2 o 2 and propylene. 40% H with ammonia 2 o 2 Adjust to pH 4.5. The reaction temperature was controlled by circulation of an aqueous cooling liquid in the cooling jacket, whereby the temperature of t...

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Abstract

The invention described herein relates to a process for the catalytic epoxidation of olefins with hydrogen peroxide in a multiphase reaction mixture comprising an liquid aqueous hydrogen peroxide rich phase containing an organic solvent having a solubility in water of at least 10 % by weight at 25 DEG C and an liquid organic olefin rich phase.

Description

Background technique [0001] From EP-A 100 119 and EP-A 230 949 it is known that propene can be converted to propylene oxide by means of hydrogen peroxide if titanium-containing zeolites are used as catalysts. [0002] Unreacted hydrogen peroxide cannot be economically recovered from the epoxidation reaction mixture. Furthermore, unreacted hydrogen peroxide involves additional work and expense in the processing of the reaction mixture. Therefore, it is preferred to carry out the epoxidation of propylene with an excess of propylene until a substantial amount of hydrogen peroxide is converted. In order to achieve high conversion of hydrogen peroxide, it is advantageous to use a continuous flow reaction system. Such a reaction system may comprise one or more continuous flow reactors or two or more flow mixing reactors connected in series. Examples of flow mixing reactors are: stirred tank reactors with liquid phase circulation, circulation reactors, fluidized bed reactors and f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D303/04C07B61/00C07D301/12
CPCC07D301/12
Inventor 托马斯·哈斯维利·霍芬斯特凡·皮尔茨格奥尔格·蒂勒沃尔夫冈·韦尔
Owner EVONIK OPERATIONS GMBH
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