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Epoxidation cyclic method for preparing epoxy propane from ethylbenzene hydroperoxide and propylene

A technology of ethylbenzene hydrogen peroxide and propylene oxide, which is applied in chemical recovery, organic chemistry, etc., can solve the problems of rising reaction temperature, achieve the effects of increasing reaction temperature, increasing the proportion of propylene, and reducing energy consumption

Inactive Publication Date: 2016-01-27
CHINA PETROLEUM & CHEM CORP +1
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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 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. With the problems such as the mol ratio of ethylbenzene hydrogen peroxide, a new epoxidation cycle process of ethylbenzene hydrogen peroxide and propylene to produce propylene oxide is provided, the method does not increase the total mole of propylene and ethylbenzene hydrogen peroxide Under the premise of the ratio, it can effectively reduce the reaction temperature rise and increase the molar ratio of the reaction propylene to ethylbenzene hydroperoxide in the catalyst bed

Method used

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  • Epoxidation cyclic method for preparing epoxy propane from ethylbenzene hydroperoxide and propylene

Examples

Experimental program
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Effect test

Embodiment 1

[0037] according to figure 1 The technical scheme shown, raw material contains the hydrogen peroxide ethylbenzene mixture of 19.34% weight concentration, and flow rate is 162367.5 kilograms / hour, is divided into two shares in proportion, enters the adiabatic fixed-bed reactor of two serial multi-bed catalysts respectively, raw material Propylene flow rate 10987.6 kg / hour in II, circulating propylene 103863.5 kg / hour, recycle stream I flow rate of peroxidation reaction product 69304.5 kg / hour, mixed with the hydrogen peroxide ethylbenzene mixture entering the catalyst bed of the first reactor, in Under the condition of reaction temperature 76℃ and reaction pressure 2.9MPaG, with Ti / SiO 2 Catalyst contact, liquid-phase epoxidation reaction to generate propylene oxide, methyl benzyl alcohol and other by-products; reactants flowing out of the first reactor and ethylbenzene hydrogen peroxide mixture entering the second reactor, cyclic epoxidation reaction The product 115508 kg / h i...

Embodiment 2

[0039] Same as [Example 1], only change the flow rate of the recycle stream: the recycle propylene flow rate is 69242.5 kg / h, the recycle epoxidation reaction product entering the first reactor is 60649.4 kg / h, and the recycle epoxidation product entering the second reactor is 60649.4 kg / h. Reaction product 101082.4 kg / hour, other [Example 1]. Hydrogen peroxide ethylbenzene weight space velocity 4.1hr -1 , the mol ratio of total propylene and ethylbenzene hydrogen peroxide is 8.03, the mol ratio of the propylene of the first reactor and the second reactor inlet and ethylbenzene hydrogen peroxide then reaches 23.3 and 21.1, the first reactor and the second The outlet temperatures of the reactors were 89.0°C and 88.3°C respectively, the total conversion rate of ethylbenzene hydroperoxide was 99.2%, and the molar selectivity of propylene oxide was 99.11%.

Embodiment 3

[0041] 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 hydroperoxide is 11.52, the mol ratio of the propylene of the first reactor and the second reactor inlet and ethylbenzene hydrogen peroxide then reaches 33.6 and 31.0, the first reactor and the second The outlet temperatures of the reactors were 87.4°C and 86.6°C respectively, the total conversion rate of ethylbenzene hydroperoxide was 99.2%, and the molar selectivity of propylene oxide was 99.15%.

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Abstract

The invention relates to an epoxidation cyclic process 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 a raw material ethylbenzene hydroperoxide sectionally goes into at least two series-connection adiabatic reactors and a raw material liquid propylene goes into at least two series-connection adiabatic reactors, 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 a part of epoxidation reaction products containing epoxy propane circulate to catalyst bed layers of the reactors. 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 an epoxidation cycle method for producing 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, saponif...

Claims

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Application Information

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IPC IPC(8): C07D301/12C07D303/04
CPCY02P20/584
Inventor 邵百祥何志
Owner CHINA PETROLEUM & CHEM CORP
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