Method for preparing epoxy propane through epoxidation of 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 and achieve the effects of increasing reaction temperature, reducing the proportion of propylene circulation, and increasing the proportion of propylene

Inactive Publication Date: 2016-01-27
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0011] The technical problem to be solved by this invention is that in the prior art, there is a higher reaction temperature rise in the reaction process of ethylbenzene hydrogen peroxide and propylene epoxidation to propylene oxide; Problems such as the mol ratio of ethylbenzene hydrogen peroxide provide a new method of ethylbenzene hydrogen peroxide and propylene epoxidation to propylene oxide, the method does not increase the total molar ratio of propylene and ethylbenzene hydrogen peroxide Under the premise, it can effectively reduce the reaction temperature rise and increase the molar ratio of propylene to ethylbenzene hydroperoxide in the catalyst bed reaction

Method used

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  • Method for preparing epoxy propane through epoxidation of ethylbenzene hydroperoxide and propylene

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Embodiment 1

[0038] according to figure 1 In the technical scheme shown, the raw material contains a 19.4% weight concentration of ethylbenzene hydrogen peroxide mixture, and the flow rate is 162367.5 kg / h. It is divided into two strands in proportion and enters two series-connected adiabatic fixed-bed reactors respectively, wherein two reactors The catalyst beds in are a single bed and a multi-bed. 10987.6 kg / hour of raw material propylene and 155795.5 kg / hour of recycled propylene are mixed with the ethylbenzene hydrogen peroxide mixture entering the first reactor. 2 Catalyst contact, liquid-phase epoxidation reaction to generate propylene oxide, methyl benzyl alcohol and other by-products; the reactant flowing out of the first reactor is mixed with the ethylbenzene hydrogen peroxide mixture entering the second reactor, and the temperature is controlled at 76°C , into the second reactor, with Ti / SiO 2 The catalyst is contacted, and the liquid-phase epoxidation reaction generates propyl...

Embodiment 2

[0040] 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 11.52, the mol ratio of the propylene of the first reactor and the second reactor inlet and ethylbenzene hydrogen peroxide then reaches 27.43 and 19.02, the first reactor and the second The outlet temperatures of the reactors were 88.8°C and 89.6°C respectively, the total conversion rate of ethylbenzene hydroperoxide was 99.2%, and the molar selectivity of propylene oxide was 99.0%.

Embodiment 3

[0042] 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]. Hydrogen peroxide ethylbenzene weight space velocity 4.1hr -1 , the mol ratio of total propylene and ethylbenzene hydrogen peroxide is 16.75, the mol ratio of propylene and ethylbenzene hydrogen peroxide of the first reactor and the second reactor layer inlet then reaches 39.89 and 27.97, the first reactor and the second reactor The outlet temperatures of the two reactors were 86.0°C and 88.1°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 method for preparing epoxy propane through epoxidation of 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 all or a part of the raw material propylene goes into an inlet of the multistage reactor, and the raw material ethylbenzene hydroperoxide sectionally goes into catalyst bed layers of the multistage adiabatic reactor in a sectionalized manner. 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 through the epoxidation of 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, sapo...

Claims

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Application Information

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