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Cumyl hydroperoxide and propylene epoxidation method for preparing epoxypropane

A technology of cumene hydrogen peroxide and propylene oxide is applied in the field of epoxidizing cumene hydrogen peroxide and propylene to prepare propylene oxide, which can solve the problems such as the increase in reaction temperature, achieve control of the temperature increase in the reaction, and improve the choice of sexual effect

Inactive Publication Date: 2014-12-24
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by this invention is that in the prior art, the reaction process of cumene hydroperoxide and propylene epoxidation to propylene oxide has a higher reaction temperature rise and needs higher propylene oxide in order to maintain a higher reaction efficiency. The problem of the molar ratio of cumene hydroperoxide and cumene hydroperoxide provides a new method for epoxidation of cumene hydroperoxide and propylene to produce propylene oxide

Method used

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  • Cumyl hydroperoxide and propylene epoxidation method for preparing epoxypropane

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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 contains a mixture of cumene hydroperoxide with a concentration of 35% by weight, and the flow rate is 101166.1 kg / hour. It is divided into two strands according to the ratio of 1:1, and enters a two-stage adiabatic fixed-bed reactor respectively. 10812.7 kg / h of raw material propylene and 92993.1 kg / h of recycled propylene are mixed with the mixture of cumene hydroperoxide entering the first catalyst bed, and are mixed with Ti / SiO 2 Catalyst contact, liquid phase epoxidation reaction generates propylene oxide and dimethyl benzyl alcohol and other by-products; The reactant flowing out of the first catalyst bed is mixed with the cumene hydroperoxide mixture entering the second catalyst bed, Control the temperature at 55°C, enter the second catalyst bed, and Ti / SiO 2 The catalyst is contacted, and the liquid-phase epoxidation reaction generates propylene oxide, dimethyl benzyl alcohol and other by-prod...

Embodiment 2

[0038] With [embodiment 1], only change the flow rate of circulating propylene: the flow rate of circulating propylene is 61995.4 kg / hour, other is the same as [embodiment 1]. Cumene hydroperoxide weight space velocity 4.5hr -1 , the mol ratio of total propylene and cumene hydroperoxide is 7.1, the mol ratio of propylene and cumene hydroperoxide of the first catalyst bed layer and the second catalyst bed inlet then reaches 17.0 and 11.5, the first catalyst bed The outlet temperatures of the bed and the second catalyst bed are 87.4°C and 88.3°C respectively, the total conversion of cumene hydroperoxide is 99.1%, and the molar selectivity of propylene oxide is 96.0%.

Embodiment 3

[0040] Same as [Example 1], only the reactor form is changed: two single-bed adiabatic fixed-bed reactors are connected in series, and the others are the same as [Example 1]. Cumene hydroperoxide weight space velocity 4.5hr -1 , the mol ratio of total propylene and cumene hydroperoxide is 10.2, and the mol ratio of propylene and cumene hydroperoxide at the inlet of the first catalyst bed and the second catalyst bed then reaches 24.2 and 16.8, the first catalyst The outlet temperatures of the bed and the second catalyst bed were 82.8°C and 84.6°C respectively, the total conversion rate of cumene hydroperoxide was 99.1%, and the molar selectivity to propylene oxide was 96.3%.

[0041]

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Abstract

The invention relates to a cumyl hydroperoxide and propylene epoxidation method for preparing epoxypropane, which mainly solves the problems of high temperature rise in reaction, and high molar ratio of propylene and cumyl hydroperoxide to keep high reaction efficiency in the prior art. The method is as below: introducing the materials of cumyl hydroperoxide and liquid phase propylene into a multistage heat insulation reaction zone with at least two stages, and contacting the materials with a Ti-silica catalyst to conduct an epoxidation reaction under the conditions of epoxidation reaction temperature of 15-160 DEG C, pressure of 1.0-12.0 MPa and molar ratio of propylene and cumyl hydroperoxide of 2-30, so as to generate epoxypropane, wherein the cumyl hydroperoxide enters each catalyst bed layer of the multistage heat insulation reaction zone. The technical scheme can well solve the above problems, and can be used in industrial production of epoxypropane from epoxidation of cumyl hydroperoxide and propylene.

Description

technical field [0001] The invention relates to a method for preparing propylene oxide through the epoxidation of cumene hydroperoxide 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, saponificatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D303/04C07D301/19
CPCC07D303/04C07D301/19
Inventor 邵百祥李木金
Owner CHINA PETROLEUM & CHEM CORP
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