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Production method of epoxy propane

A technology of propylene oxide and its production method, which is applied in the direction of organic chemistry, can solve the problems of reaction temperature rise, etc., and achieve the effects of controlling reaction temperature rise, good technical effect, and improving selectivity

Inactive Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is that there is a higher reaction temperature rise in the prior art and the need for a higher molar ratio of propylene to cumene hydroperoxide in order to maintain a higher reaction efficiency. Propylene oxide production method

Method used

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  • Production method of epoxy propane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] according to figure 1 In the technical scheme shown, the raw material contains 35% weight concentration of cumene hydroperoxide mixture, the flow rate is 101166.1 kg / hour, the raw material propylene is 10812.7 kg / hour, the circulating propylene is 92993.1 kg / hour, and the circulation with the first catalyst bed The streams are mixed into a two-stage adiabatic fixed-bed reactor. Under the conditions of a reaction temperature of 55 ° C and a reaction pressure of 3.1 MPaG, Ti / SiO 2 Catalyst contact, liquid-phase epoxidation reaction to generate propylene oxide, dimethyl benzyl alcohol and other by-products; the reactants flowing out of the first catalyst bed are mixed with the recycle stream entering the second catalyst bed, and the temperature is controlled at 55°C. into the second catalyst bed, with Ti / SiO 2 Catalyst contact, liquid phase epoxidation reaction produces propylene oxide and dimethyl benzyl alcohol and other by-products. Cumene hydroperoxide weight space v...

Embodiment 2

[0041] Same as [Example 1], only the flow rate of circulating propylene is changed: the circulating propylene flow rate is 61995.4 kg / hour, and 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 7.1, the mol ratio of propylene and cumene hydroperoxide of the first catalyst bed layer and the second catalyst bed inlet then reaches 11.3 and 22.2, the first catalyst bed The outlet temperatures of the bed and the second catalyst bed were 77.0°C and 75.7°C respectively, the total conversion rate of cumene hydroperoxide was 99.2%, and the molar selectivity to propylene oxide was 96.0%.

[0042]

Embodiment 3

[0044] 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, the mol ratio of propylene and cumene hydroperoxide of the first catalyst bed layer and the second catalyst bed inlet then reaches 16.5 and 32.6, the first catalyst bed The outlet temperatures of the bed and the second catalyst bed were 73.3°C and 72.2°C respectively, the total conversion rate of cumene hydroperoxide was 99.2%, and the molar selectivity to propylene oxide was 96.3%.

[0045]

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Abstract

The invention relates to a production method of epoxy propane and mainly aims at solving the problems of relatively high reaction temperature rise and requirement on relatively high molar ratio of propylene to cumyl hydroperoxide to keep relatively high reaction efficiency in the prior art. The problems are well solved by virtue of the following technical scheme, according to the production method, the liquid phase of the raw materials cumyl hydroperoxide and propylene is fed into a multi-section heat insulating reaction region of at least two sections; the raw materials are in contact with a Ti-silicon catalyst to have an epoxidation reaction to generate the epoxy propane under the conditions of an epoxidation reaction temperature ranging from 15 to 160 DEG C, a pressure ranging from 1.0 to 12.0MPa and a total molar ratio of the propylene to the cumyl hydroperoxide of 2-30, wherein the epoxidation reaction product containing the epoxy propane obtained at the outlet of the multi-section heat insulating reaction region is circulated to the inlet of each catalyst bed layer of the multi-section heat insulating reaction region; and the production method is applied to the industrial production of preparing the epoxy propane by virtue of epoxidation of the cumyl hydroperoxide and the propylene.

Description

technical field [0001] The present invention relates to a kind of production method of propylene oxide. 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 chloropropanol and milk of lime, and prod...

Claims

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Application Information

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IPC IPC(8): C07D301/19C07D303/04
CPCC07D301/19C07D303/04
Inventor 邵百祥张勤
Owner CHINA PETROLEUM & CHEM CORP
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