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Method for preparing epoxypropane through direct epoxidation of propylene under alkaline conditions

A technology of propylene oxide and epoxidation, which is applied in the production of organic chemistry and bulk chemicals, etc., can solve the problems of poor utilization of raw materials, decrease in reaction selectivity and propylene conversion rate, decrease in reaction gas concentration, etc. consumption, increase selectivity, increase the effect of concentration

Pending Publication Date: 2022-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of a large amount of diluent gas will lead to a decrease in the concentration of the reaction gas, poor utilization of raw materials, and a decrease in reaction selectivity and propylene conversion.

Method used

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  • Method for preparing epoxypropane through direct epoxidation of propylene under alkaline conditions
  • Method for preparing epoxypropane through direct epoxidation of propylene under alkaline conditions
  • Method for preparing epoxypropane through direct epoxidation of propylene under alkaline conditions

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Embodiment approach

[0024] According to a preferred embodiment of the present invention, the alkaline substance is ammonia.

[0025] According to the present invention, the form of introducing the alkaline substance into the reaction system is not particularly limited, and can be introduced into the reaction system in any of the following ways:

[0026] (1) Without changing the gas path, add a certain amount of alkaline substances during the configuration of the reaction raw material gas. as in H 2 Alkaline gas is mixed in, the preparation of H 2 Mixed gas with alkaline gas, through H 2 The gas path enters the reaction system without changing the pipeline layout of the original reaction device.

[0027] (2) A new gas pipeline is added, connected to the reaction system, fully mixed with the original reaction raw material gas in the mixer, and then enters the reactor.

[0028] (3) Transformation is carried out on the reaction raw material gas or dilution gas path, so that the reaction raw mater...

Embodiment 1

[0077] This embodiment is used to illustrate the method for the direct epoxidation of propylene provided by the invention

[0078] In a tubular reactor, relative to a 10ml reactor, 0.20g of Au@TS-1 molecular sieve catalyst (the loading of Au is 1% by weight) and 20g of quartz sand were layered into the reactor, as shown in the attached figure 1 Shown in (c), wherein, the layer height ratio of the catalyst layer and the quartz sand layer is 1:2, and the catalyst layer and the inert filler layer are each independently 15 layers / cm, and carry out the direct epoxidation reaction of propylene gas phase .

[0079] Among them, raw material gas H 2 , O 2 、C 3 h 6 (as a reaction gas), C 3 h 6 (as a dilution gas) enters the mixer and enters the preheater after mixing, and enters the tubular reactor after preheating to 160°C, wherein ammonia is added by mixing hydrogen, compared to the mixed gas of reaction raw material gas and diluent gas , the doping amount of ammonia is 800ppm....

Embodiment 2

[0081] This embodiment is used to illustrate the method for the direct epoxidation of propylene provided by the invention

[0082] In a tubular reactor, relative to a 10ml reactor, 0.20g of Au@TS-1 molecular sieve catalyst (the loading of Au was 1% by weight) and 18g of quartz sand were layered into the reactor, as shown in the attached figure 1 As shown in middle (c), wherein, the layer height ratio of the catalyst layer and the quartz sand layer is 1:1.5, and the catalyst layer and the inert filler layer are each independently 10 layers / cm, and the gas phase direct epoxidation reaction of propylene is carried out .

[0083] Among them, raw material gas H 2 , O 2 、C 3 h6 (as a reaction gas), C 3 h 6 (as a diluent gas) enters the mixer and enters the preheater after mixing, and enters the tubular reactor after preheating to 130°C, wherein ammonia gas is added by mixing hydrogen gas, relative to the mixed gas of reaction raw material gas and diluent gas , the doping amoun...

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Abstract

The invention relates to the field of preparation of epoxypropane, in particular to a method for preparing epoxypropane through direct epoxidation of propylene under alkaline conditions. The method comprises the following steps: under the condition for propylene epoxidation reaction and in the presence of an alkaline substance, carrying out contact reaction on mixed gas comprising reaction raw material gas and diluent gas and a catalyst to obtain epoxypropane, wherein the reaction raw material gas comprises propylene, oxygen and hydrogen, and the diluent gas is propylene. When the method is used for preparing the epoxypropane, the dosage of diluent gas can be effectively reduced, so that the concentration of reaction gas and the utilization rate of raw materials are relatively improved, and the reaction selectivity and the conversion rate are further improved.

Description

technical field [0001] The invention relates to the field of propylene oxide preparation, in particular to a method for preparing propylene oxide by direct epoxidation of propylene under alkaline conditions. Background technique [0002] Propylene oxide, also known as propylene oxide and methyl oxirane, is a very important organic compound raw material and the third largest propylene derivative after polypropylene and acrylonitrile. Propylene oxide is a colorless ether-like liquid with a low boiling point and is flammable. There is chirality, and the industrial product is generally a racemic mixture of two enantiomers. Partially miscible with water, miscible with ethanol and ether. It forms a binary azeotrope with pentane, pentene, cyclopentane, cyclopentene and methylene chloride. [0003] Propylene oxide is mainly used in the production of polyether polyols, propylene glycol and various nonionic surfactants, among which polyether polyols are important raw materials for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D303/04C07D301/08C07D301/10
CPCC07D303/04C07D301/08C07D301/10Y02P20/52
Inventor 赵辰阳朱红伟王林孙冰冯俊杰王世强
Owner CHINA PETROLEUM & CHEM CORP
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