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Alkene epoxidation method

A technology of epoxidation reaction and olefin, which is applied in the direction of organic chemistry, can solve the problems of low selectivity of propylene oxide and low conversion rate of hydrogen peroxide, etc., reduce equipment cost, shorten production cycle, and overcome the problem of low selectivity Effect

Active Publication Date: 2014-01-15
CHINA PETROLEUM & CHEM CORP +2
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the low conversion rate of hydrogen peroxide used in the reaction existing in the prior art and the low selectivity of propylene oxide, to provide a method that can make the conversion rate of hydrogen peroxide in the reaction high and obtain Olefin Oxide Epoxidation Process with High Selectivity of Propylene Oxide

Method used

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  • Alkene epoxidation method

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Experimental program
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Effect test

Embodiment 1

[0040] (1) The titanium-silicon molecular sieve-shaped catalyst was loaded in a fixed-bed reactor (purchased from Penglai Luhao Chemical Machinery Co., Ltd.), and the loading amount of the catalyst was 15 ml. A first mixed material containing propylene, methanol and hydrogen peroxide is introduced into the fixed bed reactor, wherein, in the first mixed material, the molar ratio of methanol, propylene and hydrogen peroxide is 4:4:1. The conditions of the reaction include: the temperature is 35°C, the pressure is 1MPa, and the volume space velocity of the first mixed material is 0.5h -1 , adjust the pH=5 of the first mixture material with ammoniacal liquor, detect the amount of hydrogen peroxide in the mixture after the reaction by iodometric method, and calculate the conversion ratio of hydrogen peroxide according to the calculation formula (1) shown above, the result As shown in Table 1. And detect the amount of propylene oxide generated in the step (1) by the chromatographic...

Embodiment 2

[0047] (1) The titanium-silicon molecular sieve-shaped catalyst was loaded in a fixed-bed reactor (purchased from Penglai Luhao Chemical Machinery Co., Ltd.), and the loading amount of the catalyst was 15 ml. A first mixed material containing propylene, methanol and hydrogen peroxide is introduced into the fixed bed reactor, wherein, in the first mixed material, the molar ratio of methanol, propylene and hydrogen peroxide is 10:3:1. The conditions of the reaction include: the reaction temperature is 75°C, the reaction pressure is 4MPa, and the volume space velocity of the first mixed material is 6h -1 , adjust the pH=7 of the first mixture material with ammoniacal liquor, detect the amount of hydrogen peroxide in the mixture after the reaction by iodometric method, and calculate the conversion rate of hydrogen peroxide according to the calculation formula (1) shown above, the result is as follows Table 1 shows. And detect the amount of propylene oxide generated in the step (1...

Embodiment 3

[0050] (1) The titanium-silicon molecular sieve-shaped catalyst was loaded in a fixed-bed reactor (purchased from Penglai Luhao Chemical Machinery Co., Ltd.), and the loading amount of the catalyst was 15 ml. A first mixed feed containing propylene, methanol and hydrogen peroxide is introduced into the fixed bed reactor, wherein, in the first mixed feed, the molar ratio of methanol, propylene and hydrogen peroxide is 8:0.8:1. The conditions of the reaction include: the reaction temperature is 50°C, the reaction pressure is 3MPa, and the volume space velocity of the first mixed material is 5h -1 , adjust the pH=6 of the first mixture material with ammoniacal liquor, detect the amount of hydrogen peroxide in the mixture after the reaction by iodometric method, and calculate the conversion rate of hydrogen peroxide according to the calculation formula (1) shown above, the result is as follows Table 1 shows. And detect the amount of propylene oxide generated in the step (1) by th...

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Abstract

The invention provides an alkene epoxidation method which comprises the following steps: (1) under alkene epoxidation reaction conditions, carrying out epoxidation reaction on a first mixture containing alkene, solvent and hydrogen peroxide in a fixed bed type reactor in the presence of a first solid catalyst, and ensuring that the conversion rate of the hydrogen peroxide is 50% or above; and (2) under alkene epoxidation reaction conditions, introducing the reaction mixture obtained in the step (1) and a second solid catalyst into a slurry bed type reactor for epoxidation reaction, and ensuring that the total conversion rate of the hydrogen peroxide is 95% or above. By combining the fixed bed type reactor and the slurry bed type reactor, the method provided by the invention overcomes the disadvantage of low hydrogen peroxide conversion rate in the reaction process of using the fixed bed type reactor only, and overcomes the disadvantage of poor epoxy propane selectivity in the reaction process of using the slurry bed type reactor only.

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 synthesized by epoxidation of propylene with oxidant hydrogen peroxide. 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 do...

Claims

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Application Information

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