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Method for epoxidizing olefinic hydrocarbon

A technology of epoxidation reaction and olefin, which is applied in the direction of organic chemistry, can solve the problems of low selectivity and incomplete conversion of propylene oxide, and achieve the effects of reducing equipment cost, overcoming low selectivity and shortening the production cycle

Active Publication Date: 2014-01-15
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcoming that the conversion of hydrogen peroxide used in the reaction existing in the prior art is incomplete and the selectivity of propylene oxide is low, and a kind of hydrogen peroxide used in the reaction can be converted completely and obtained Olefin epoxidation method with high selectivity of propylene oxide

Method used

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  • Method for epoxidizing olefinic hydrocarbon

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Experimental program
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Effect test

Embodiment 1

[0037] (1) The titanium-silicon molecular sieve powder catalyst was loaded in a moving bed reactor (purchased from Chengdu Xindu Yongtong Machinery Factory), and the concentration of the catalyst in the material was 5% by weight. A first mixed material containing propylene, methanol and hydrogen peroxide is introduced into the moving bed reactor, wherein, in the first mixed material, the molar ratio of methanol, propylene and hydrogen peroxide is 10:4:1. The conditions of the reaction include: the temperature is 35° C., the pressure is 1 MPa, the time is 8 hours, the pH=5 of the first mixture material is adjusted with ammonia water, the amount of hydrogen peroxide in the reaction mixture is detected by the iodometric method, and Calculate the conversion rate of hydrogen peroxide according to the calculation formula (1) shown above, and the results are shown in Table 1. The amount of propylene oxide generated in the step (1) is detected by the chromatographic internal standard ...

Embodiment 2

[0044] (1) The titanium-silicon molecular sieve powder catalyst was loaded in a moving bed reactor (purchased from Chengdu Xindu Yongtong Machinery Factory), and the concentration of the catalyst in the material was 5% by weight. The first mixed material containing propylene, methanol and hydrogen peroxide is introduced into the moving bed reactor, wherein, in the first mixed material, the molar ratio of methanol, propylene and hydrogen peroxide is 4:2:1. The conditions of the reaction include: the reaction temperature is 75° C., the reaction pressure is 4 MPa, the time is 2 hours, the pH=7 of the first mixture material is adjusted with ammonia water, and the amount of hydrogen peroxide in the reaction mixture is detected by iodometric method, And calculate the conversion ratio of hydrogen peroxide according to the calculation formula (1) shown above, the results are as shown in table 1. And detect the amount of propylene oxide generated in the step (1) by the chromatographic ...

Embodiment 3

[0047] (1) The titanium-silicon molecular sieve powder catalyst was loaded in a moving bed reactor (purchased from Chengdu Xindu Yongtong Machinery Factory), and the concentration of the catalyst in the material was 5% by weight. A first mixed feed containing propylene, methanol, and hydrogen peroxide is introduced into the moving bed reactor, wherein, in the first mixed feed, the molar ratio of methanol, propylene, and hydrogen peroxide is 6:0.5:1. The conditions of the reaction include: the reaction temperature is 50° C., the reaction pressure is 3 MPa, the time is 5 hours, the pH=6 of the first mixture material is adjusted with ammonia water, and the amount of hydrogen peroxide in the reaction mixture is detected by iodometric method, And calculate the conversion rate of propane hydroperoxide according to the calculation formula (1) shown above, the results are as shown in table 1. And detect the amount of propylene oxide generated in the step (1) by the chromatographic int...

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Abstract

The invention provides a method for epoxidizing olefinic hydrocarbon. The method comprises the following steps of: firstly, under the condition of an epoxidation reaction of the olefinic hydrocarbon and in the presence of a first solid catalyst, enabling a fixed mixed material containing a solvent, the olefinic hydrocarbon and hydrogen peroxide to carry out the epoxidation reaction in a moving-bed reactor, wherein the conversion rate of the hydrogen peroxide is enabled to reach over 50 percent by the reaction degree; and secondly, under the epoxidation reaction of the olefinic hydrocarbon, introducing the reaction mixture obtained in the first step and a second solid catalyst to a slurry-bed reactor and carrying out the epoxidation reaction, wherein the total conversion rate of the hydrogen peroxide is enabled to reach over 95 percent by the reaction degree. According to the method provided by the invention, due to the adoption of combination of the moving-bed reactor with the slurry-bed reactor, the defect that the conversion rate of the hydrogen peroxide is low when the moving-bed reactor is only used for reaction is overcome; meanwhile, the defect that the selectivity of epoxypropane is low when the slurry-bed reactor is only used for reaction is overcome.

Description

technical field [0001] The invention relates to an olefin epoxidation method. Background technique [0002] At present, propylene oxide is mainly produced by chlorohydrin method and co-oxidation method in the world. The chlorohydrin method will be phased out gradually due to the pollution problem; while the co-oxidation method is restricted by the application of by-product outlets, and it is impossible to obtain large-scale development. Therefore, the production method of propylene oxide of prior art all seriously restricts the production of propylene oxide. In recent years, a new method for preparing propylene oxide has emerged. Under the catalysis of titanium-silicon molecular sieve, propylene oxide is epoxidized by oxidant hydrogen peroxide to synthesize propylene oxide. The method has the advantages of mild conditions, environmental friendliness and no pollution, and becomes a green new process for producing propylene oxide. [0003] For example, CN1671678A adopts dou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D301/12C07D303/04
Inventor 李华何驰剑林民王伟伍小驹高计皂
Owner CHINA PETROLEUM & CHEM CORP
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