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Reaction method of ethylbenzene hydrogen peroxide and propylene to produce propylene oxide

A technology of ethylbenzene hydrogen peroxide and propylene oxide, which is applied in organic chemistry and other fields, can solve the problems of reaction temperature rise, achieve the effects of reducing reaction pressure, increasing the proportion of propylene, and controlling reaction temperature rise

Active Publication Date: 2017-11-17
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
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Problems solved by technology

[0010] The technical problem to be solved by this invention is that in the prior art, the reaction method 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 reaction process for producing propylene oxide from ethylbenzene hydrogen peroxide and propylene is provided. The method does not increase the total molar ratio of propylene to ethylbenzene hydrogen peroxide It 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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  • Reaction method of ethylbenzene hydrogen peroxide and propylene to produce propylene oxide

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Experimental program
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Effect test

Embodiment 1

[0035] according to figure 1 The technical scheme shown, raw material contains the hydrogen peroxide ethylbenzene mixture of 19.4% weight concentration, and flow rate is 162367.5 kg / hour, raw material propylene 10987.6 kg / hour and circulating propylene 155795.5 kg / hour, enters two series multi-bed catalysts In an adiabatic fixed bed reactor, under the conditions of reaction temperature 76°C and reaction pressure 2.9MPaG, Ti / SiO 2 Catalyst contact, liquid phase epoxidation reaction to generate propylene oxide, methyl benzyl alcohol and other by-products; the reactants flowing out of the first reactor are mixed with the recycle stream entering the second reactor, the temperature is controlled at 76 °C, and enter the second reactor The reactor is in contact with Ti / SiO2 catalyst, and the liquid phase epoxidation reaction generates propylene oxide, methyl benzyl alcohol and other by-products. Ethyl Hydroperoxide Gravity Space Velocity 4.1 hr -1 , the mol ratio of total propylene...

Embodiment 2

[0037] Same as [Example 1], only change the flow rate of circulating propylene: the flow rate of circulating propylene is 103863.5 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 and ethylbenzene hydrogen peroxide is 11.5, the mol ratio of the propylene of the first reactor and the second reactor inlet and ethylbenzene hydrogen peroxide then reaches 11.5 and 23.2, the first reactor and the second The outlet temperatures of the reactors were 88.8°C and 88.6°C respectively, the total conversion rate of ethylbenzene hydroperoxide was 99.2%, and the molar selectivity of propylene oxide was 99.0%.

Embodiment 3

[0039] Same as [Example 1], only the reactor form is changed: two adiabatic fixed-bed reactors with a single-bed catalyst are connected in series, and the others are the same as [Example 1]. Ethyl Hydroperoxide Gravity Space Velocity 4.1 hr -1 , the mol ratio of total propylene and ethylbenzene hydroperoxide is 16.75, the mol ratio of the propylene of the first reactor and the second reactor inlet and ethylbenzene hydrogen peroxide then reaches 16.75 and 34.12, the first reactor and the second The outlet temperatures of the reactors were 87.1°C and 86.8°C respectively, the total conversion rate of ethylbenzene hydroperoxide was 99.2%, and the molar selectivity of propylene oxide was 99.1.

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Abstract

The invention relates to a reaction method for producing propylene oxide from ethylbenzene hydrogen peroxide and propylene. The question of the molar ratio of benzene. The present invention enters at least two series-connected adiabatic reactors by using raw materials ethylbenzene hydrogen peroxide and propylene liquid phase, and the total amount of propylene and ethylbenzene hydrogen peroxide Under the condition of molar ratio of 1-20, contact with Ti-silica catalyst for epoxidation reaction to generate propylene oxide; among them, the part of epoxidation reaction product containing propylene oxide is recycled to the catalyst bed of each reactor in proportion The technical scheme of the layer entrance solves this problem well, and can be used in the industrial production of propylene oxide from ethylbenzene hydroperoxide and propylene epoxidation.

Description

technical field [0001] The invention relates to a reaction 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/04C07D301/19
Inventor 邵百祥李木金
Owner CHINA PETROLEUM & CHEM CORP
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