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A kind of 2-methyl-2-butene production process

A production process and technology for butene, applied in the field of fine chemical intermediates, can solve problems such as difficulty in meeting industrial production requirements, difficulty in obtaining high purity, complex reaction process, etc., to improve selectivity and reaction depth, and prevent excessive temperature difference. , the effect of simple process

Active Publication Date: 2021-08-10
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, the current industrial production and the production of tert-amylene products in various literatures generally adopt the process flow of C5 etherification-etherlysis-washing methanol-rectification-isomerization, which has a long process flow, complex reaction process, It is difficult to obtain high-purity (generally about 94%) 2-methyl-2-butene products and other shortcomings, it is difficult to meet the requirements of high-purity 2-methyl-2-butene for industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] At a pressure of 1.2MPa, an inlet temperature of 40°C, a hydrogen diene ratio (mole) of 1.15, and a space velocity of 0.65h -1 1. Under the condition that the distillation tower overhead mixture returns to a dilution ratio of 30, selective hydrogenation and isomerization reactions occur under the action of the QSH-01 catalyst, and the conversion rate of isoprene is 70%. 2-Methyl- The isomerization rate of 1-butene was 60%. The reacted material enters the rectification tower, and under the conditions of pressure 0.40MPa, reflux ratio 3.0, 20 theoretical plates in the rectification section, and 40 theoretical plates in the stripping section, the 2-methyl -2-butene products.

Embodiment 2

[0025] At a pressure of 1.3MPa, an inlet temperature of 35°C, a hydrogen diene ratio (mole) of 1.1, and a space velocity of 0.60h -1 1. Under the condition that the distillation tower overhead mixture returns to a dilution ratio of 40, selective hydrogenation reaction and isomerization reaction occur under the action of QSH-01 catalyst, and the conversion rate of isoprene is 67%, and 2-methyl- The isomerization rate of 1-butene was 62%. The reacted material enters the rectification tower, and under the conditions of pressure 0.35MP, reflux ratio 3.5, 20 theoretical plates in the rectification section, and 40 theoretical plates in the stripping section, 2-methyl -2-butene products.

Embodiment 3

[0027] At a pressure of 1.1MPa, an inlet temperature of 45°C, a hydrogen diene ratio (mole) of 1.17, and a space velocity of 0.70h -1 1. Under the condition that the mixture at the top of the rectification tower returns to a dilution ratio of 35, selective hydrogenation reaction and isomerization reaction occur under the action of QSH-01 catalyst, and the conversion rate of isoprene is 72%, and 2-methyl- The isomerization rate of 1-butene was 59%. The reacted material enters the rectification tower, under the conditions of pressure 0.45 MPa, reflux ratio 2.5, 20 theoretical plates in the rectification section, and 40 theoretical plates in the stripping section, the 2-methyl- 2-butene products.

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Abstract

A 2-methyl-2-butene production process belongs to the technical field of fine chemical intermediates. It is characterized in that the preparation steps include: hydrogen and isoprene are mixed according to the hydrogen / diene ratio = 1.05~1.3, and then enter the fixed-bed hydrogenation reactor, and the isoprene in the fixed-bed hydrogenation reactor is converted into 2 The conversion rate of -methyl-1-butene and 2-methyl-2-butene is 60%~80%, and the conversion of 2-methyl-1-butene into 2-methyl-2-butene The rate is 56%~66%. The reacted material enters the rectifying tower, and the mixture obtained at the top of the rectifying tower returns to the inlet of the fixed-bed hydrogenation reactor to dilute the concentration of isoprene. 99.5% 2-methyl-2-butene product. The technical process of the invention is simpler, and the purity of the product is greatly improved.

Description

technical field [0001] A 2-methyl-2-butene production process belongs to the technical field of fine chemical intermediates. Background technique [0002] Tert-amylene is an important raw material for fine chemical intermediates. It is a colorless and volatile liquid with an unpleasant smell. It is usually a mixture of 2-methyl-1-butene and 2-methyl-2-butene. It is mainly used in the production of isoprene, pinacol and tert-amyl alcohol, and can also be used as an intermediate for synthetic rubber, resin and organic synthesis. Its derivatives p-tert-amylphenol and 2,4-di-tert-amylphenol can be Used as photographic photosensitive material, dye intermediate, ultraviolet absorber and surfactant, etc. With the development of green chemical industry today, the demand is growing rapidly. Among them, the refinery catalytic cracking C5 fraction contains about 8% tert-amylene, and the cracked C5 fraction also contains a small amount of tert-amylene, which can be extracted by the fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C5/05C07C7/04C07C11/10
CPCC07C5/05C07C7/04C07C11/10
Inventor 董凌云彭光辉郭岩峰裴小静张剑
Owner CHINA PETROLEUM & CHEM CORP
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