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Method for preparing epoxy propane from ethylbenzene hydroperoxide and propylene

A technology of ethylbenzene hydrogen peroxide and propylene oxide, which is applied in the direction of organic chemistry, can solve the problems of rising reaction temperature, achieve the effect of increasing reaction temperature, reducing the proportion of propylene circulation, and increasing the reaction speed

Inactive Publication Date: 2016-01-27
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by this invention is that in the prior art, the reaction process of ethylbenzene hydrogen peroxide and propylene epoxidation to propylene oxide has a higher reaction temperature rise and requires higher propylene oxide to maintain a higher reaction efficiency. To solve the problems such as the molar ratio of ethylbenzene hydrogen peroxide and ethylbenzene hydrogen peroxide, a new method for producing propylene oxide from ethylbenzene hydrogen peroxide and propylene is provided, without increasing the total molar ratio of propylene to ethylbenzene hydrogen peroxide , which can effectively reduce the reaction temperature rise and increase the molar ratio of reaction propylene to ethylbenzene hydroperoxide in the catalyst bed

Method used

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  • Method for preparing epoxy propane from ethylbenzene hydroperoxide and propylene

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Experimental program
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Effect test

Embodiment 1

[0035] according to figure 1 In the technical scheme shown, the raw material I is a hydrogen peroxide ethylbenzene mixture containing 19.4% by weight, and the flow rate is 162367.5 kg / hour. The propylene flow rate in raw material II is 10987.6 kg / hour, the circulating propylene is 103863.5 kg / hour, the circulating flow rate in the epoxidation reaction product containing propylene oxide is 184812.6 kg / hour, and the hydrogen peroxide entering the first reactor catalyst bed Ethylbenzene mixture is mixed, under the conditions of reaction temperature 76°C and reaction pressure 2.9MPaG, contact with Ti / SiO2 catalyst, liquid phase epoxidation reaction to generate propylene oxide, methyl benzyl alcohol and other by-products; flow out of the first reaction The reactants in the catalyst bed of the second reactor are mixed with the ethylbenzene hydrogen peroxide mixture entering the catalyst bed of the second reactor, and the temperature is controlled at 76°C, and then enter the catalyst...

Embodiment 2

[0037] Same as [Example 1], only the flow rate of circulating propylene is changed: the circulating propylene flow rate is 69242.5 kg / hour, the circulating epoxidation reaction product is 161731.8 kg / hour, and others are the same as [Example 1]. Hydrogen peroxide ethylbenzene weight space velocity 4.1hr -1 , the mol ratio of total propylene to ethylbenzene hydroperoxide is 8.03, the mol ratio of propylene to ethylbenzene hydroperoxide at the inlet of the first catalyst bed and the second catalyst bed then reaches 30.17 and 21.11, the first catalyst bed and the outlet temperatures of the second catalyst bed were 87.0°C and 88.3°C respectively, the total conversion rate of ethylbenzene hydroperoxide was 99.2%, and the molar selectivity of propylene oxide was 99.1%.

Embodiment 3

[0039] Same as [Example 1], only the reactor form is changed: two double-bed adiabatic fixed-bed reactors are connected in series, and the others are the same as [Example 1]. Hydrogen peroxide ethylbenzene weight space velocity 4.1hr -1 , the mol ratio of total propylene and ethylbenzene hydrogen peroxide is 11.52, and the mol ratio of propylene and ethylbenzene hydrogen peroxide then reaches 43.95 and 31.07 at the catalyst bed inlet of the first reactor catalyst bed and the second reactor catalyst bed, the first The outlet temperatures of the catalyst bed of the first reactor and the catalyst bed of the second reactor were 85.2°C and 86.6°C respectively, the total conversion rate of ethylbenzene hydroperoxide was 99.2%, and the molar selectivity of propylene oxide was 99.2%.

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Abstract

The invention relates to a method for preparing epoxy propane from ethylbenzene hydroperoxide and propylene, and is used for mainly solving the problems in the prior art that reaction temperature rising is higher and higher molar ratio of propylene to ethylbenzene hydroperoxide is needed for maintaining higher reaction efficiency. The problems are better solved through adopting the technical schemes that raw materials of ethylbenzene hydroperoxide and liquid propylene go into a multistage adiabatic reactor, and under conditions of the reaction temperature of 15-160 DEG C, the pressure of 1.0-12.0 MPa and the total molar ratio of propylene to ethylbenzene hydroperoxide of 1-20, the raw materials make contact with a Ti-silica catalyst and subjected to an epoxidation reaction to generate epoxy propane, wherein the raw material ethylbenzene hydroperoxide goes into catalyst bed layers of the multistage adiabatic reactor in a sectionalized manner, and a part of epoxidation reaction products containing epoxy propane circulate to an inlet of the reactor. The method can be used in industrial production of preparation of epoxy propane through epoxidation of ethylbenzene hydroperoxide and propylene.

Description

technical field [0001] The invention relates to a method for preparing propylene oxide from ethylbenzene hydrogen peroxide and propylene. Background technique [0002] Propylene oxide is an important basic chemical raw material and the third largest propylene derivative after polypropylene and acrylonitrile. It is mainly used in the production of polyether and propylene glycol. It is also the main raw material of the fourth-generation detergent non-ionic surfactant, oil field demulsifier, pesticide emulsifier, etc. Propylene oxide derivatives are widely used in industries such as automobiles, construction, food, tobacco, medicine and cosmetics. Nearly 100 kinds of downstream products have been produced, which are important raw materials for fine chemical products. [0003] The traditional production process of propylene oxide is the chlorohydrin process, which includes three steps: chloroalcoholization of propylene and hypochlorous acid solution, saponification of chloropr...

Claims

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Application Information

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IPC IPC(8): C07D303/04C07D301/19
Inventor 邵百祥何志
Owner CHINA PETROLEUM & CHEM CORP
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