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Method for preparing propylene oxide by comprehensive utilization of C4 hydrocarbons

A technology of propylene oxide and carbon tetrahydrocarbons, which is applied in sustainable manufacturing/processing, organic chemistry, climate sustainability, etc., can solve the problems of low utilization rate and low added value of carbon tetrahydrocarbons, and achieve comprehensive utilization The effect of high efficiency and added value and high yield

Active Publication Date: 2018-11-20
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The technical problem to be solved by the present invention is the problem of low C4 hydrocarbon utilization rate and low added value in the prior art

Method used

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  • Method for preparing propylene oxide by comprehensive utilization of C4 hydrocarbons

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Experimental program
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Effect test

Embodiment 1

[0021] according to figure 1 Shown, C4 feed composition (weight %) is: isobutane 85.0%, isobutene 6.0%, butadiene 4.0%, 1-butene: 3.2%, 2-butene: 1.6%, n-butane: 0.2%. The catalyst for the selective hydrogenation reaction is palladium supported on alumina, the reactor inlet temperature is 30°C, the reaction pressure is 1.0MPaG, and the reaction space velocity is 18hr -1 , the molar ratio of hydrogen to butadiene is 1.16; the total number of theoretical plates in the reactive distillation column is 55 (counting from top to bottom, the same below), the number of theoretical plates in the rectification section is 5, and the reaction section is equivalent to the height of 8 theoretical plates , the feeding position is the 14th plate, the catalyst in the reaction section is palladium supported on alumina, and the rest is filled with stainless steel triangular spiral packing, and the operating pressure at the top of the tower is 0.5MPaG; the skeletal isomerization catalyst is titan...

Embodiment 2

[0023] according to figure 1 Shown, C4 feed composition (weight %) is: isobutane 70.0%, isobutene 10.0%, butadiene 8.0%, 1-butene: 5.2%, 2-butene: 4.0%, n-butane: 2.8%. The selective hydrogenation reaction catalyst is aluminum oxide supported metal palladium, the reactor inlet temperature is 40°C, the reaction pressure is 2.0MPaG, and the reaction space velocity is 15hr -1 , the molar ratio of hydrogen to butadiene is 1.12; the total number of theoretical plates in the reactive distillation column is 60 (counting from top to bottom, the same below), the number of theoretical plates in the rectification section is 5, and the height of the reaction section is equivalent to 10 theoretical plates , the feeding position is the 16th plate, the catalyst in the reaction section is palladium supported on alumina, and the rest is filled with stainless steel triangular spiral packing, the operating pressure at the top of the tower is 0.5MPaG; the skeletal isomerization reaction catalyst...

Embodiment 3

[0025] according to figure 1 Shown, carbon four hydrocarbon composition (weight %) is: isobutane: 50.0%, isobutene 15.0%, butadiene 10.0%, 1-butene: 8.2%, 2-butene: 9.0%, n-butane: 7.8%. The catalyst for the selective hydrogenation reaction is aluminum oxide supported metal nickel, the reactor inlet temperature is 40°C, the reaction pressure is 2.5MPaG, and the reaction space velocity is 10hr -1 , the molar ratio of hydrogen to butadiene is 1.10; the total number of theoretical plates in the reactive distillation column is 65 (counting from top to bottom, the same below), the number of theoretical plates in the rectification section is 5, and the height of the reaction section is equivalent to 12 theoretical plates , the feeding position is the 18th plate, the catalyst in the reaction section is nickel metal supported on alumina, and the rest is filled with stainless steel triangular spiral packing, the operating pressure at the top of the tower is 0.6MPaG; the catalyst for s...

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Abstract

The invention relates to a method for preparing epoxypropane through comprehensive utilization of C4 hydrocarbon. The method mainly solves the problems of low utilization rate and low added value of C4 hydrocarbon in the prior art. The method provided by the invention comprises the following steps: (a) hydrogenating butadiene in the C4 hydrocarbon so as to obtain monoolefine by using a selective hydrogenation technology; (b) isomerizing 1-butene in the C4 hydrocarbon to obtain 2-butene by using a reaction distillation technology; (c) separating isobutane from isobutene by adopting an extractive distillation technology; (d) isomerizing isobutene to obtain n-butene by using a skeletal isomerization technology; (e) reacting 2-butene with ethylene produce propylene by using an olefin disproportionation technology; and (f) reacting isobutane with oxygen to produce tert-butyl hydroperoxide by using an isobutane cooxidation technology, and reacting tert-butyl hydroperoxide with propylene so as to produce epoxypropane. With such a technical scheme in the invention, the method solves the above-mentioned problems, and can be applied to industrial application of producing epoxypropane and improving the chemical comprehensive utilization rate of C4 hydrocarbon.

Description

technical field [0001] The invention relates to a method for comprehensively utilizing C4 hydrocarbons to prepare propylene oxide. Background technique [0002] Propylene oxide (PO) is an important basic organic chemical raw material. It is the third largest propylene derivative besides polypropylene and acrylonitrile. It is mainly used in the production of polyether polyols, propylene glycol and various nonionic surfactants. . At present, the production processes of propylene oxide mainly include chlorohydrin method, co-oxidation method and hydrogen peroxide direct oxidation method. The chlorohydrin method will be phased out gradually due to the characteristics of serious pollution and high energy consumption. Co-oxidation method is also called indirect oxidation method, which can be divided into ethylbenzene co-oxidation method (co-production styrene co-oxidation method, referred to as PO / SM method), isobutane co-oxidation method (co-production tert-butanol co-oxidation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/04C07D301/08
CPCC07D301/08C07D303/04Y02P20/10Y02P20/129
Inventor 陈伟杨卫胜李木金
Owner CHINA PETROLEUM & CHEM CORP