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A kind of method for preparing isoamylene

A technology of isopentene and isopentane, applied in the field of preparation of isopentene, can solve problems such as cracking side reactions, and achieve the effect of significant value-added and simple and easy separation

Active Publication Date: 2022-03-04
HUNAN ZHONGCHUANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] It can be seen that most of the publicly reported methods for preparing isopentene are completed under relatively harsh conditions, and isopentene may also undergo cracking side reactions at high temperatures.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The reaction conditions are: isopentane 720g / h, butene-rich (containing isobutane 0.97%, n-butane 44.53%, trans-butene 22.75%, n-butene 21.30%, isobutene 0.29%, butene 10.16%) 2000g / h, 600g / h acetic acid, through a fixed bed tube reactor filled with D001 macroporous acidic cation exchange resin, the reaction temperature is 60°C, the reaction pressure is 1.5MPa, and the total residence time is 1.5h. After the reaction was completed, samples were taken for analysis, among them, isopentane 8.51%, isopentene 12.40%, isobutane 0.53%, n-butane 37.45%, trans-butene 10.93%, n-butene 2.66%, isobutene 0.24%, cis Butene 2.95%, acetic acid 13.70%, sec-butyl acetate 13.70%. Through separation, about 704g / h of carbon five components can be obtained, which contains 59.37% of isopentene and 40.63% of isopentane. The total conversion rate of isopentane is calculated to be 60.28%, and the total selectivity of isopentene is 99.06% %.

Embodiment 2

[0025] The reaction conditions are: isopentane 720g / h, mixed butene (containing isobutane 1.36%, n-butane 47.80%, trans-butene 35.34%, n-butene 3.17%, isobutene 0.09%, butene 12.23%) 2000g / h, acetic acid 600g / h, passed through a fixed bed tube reactor filled with D001 macroporous acidic cation exchange resin, the reaction temperature was 100°C, the reaction pressure was 2.0MPa, and the total residence time was 1h. After the reaction was completed, samples were taken for analysis, of which, 6.12% isopentane, 13.89% isopentene, 0.82% isobutane, 41.42% n-butane, 14.18% trans-butene, 0.28% n-butene, 0.09% isobutene, cis Butene 1.42%, acetic acid 11.91%, sec-butyl acetate 9.87%. Through separation, about 702g / h of carbon five components can be obtained, which contains 69.66% of isopentene and 30.34% of isopentane. The total conversion rate of isopentane is calculated to be 70.42%, and the total selectivity of isopentene is 99.20% %.

Embodiment 3

[0027] The reaction conditions are: isopentane 720g / h, butene-rich (containing isobutane 0.97%, n-butane 44.53%, trans-butene 22.75%, n-butene 21.30%, isobutene 0.29%, butene 10.16%) 2000g / h, acetic acid 600g / h, passed through a fixed-bed tube reactor filled with keggin-type phosphotungstic acid (ie, phosphotungstic heteropoly acid), the reaction temperature was 130°C, the reaction pressure was 2.0MPa, and the total residence time was 2h. After the reaction was completed, samples were taken for analysis, of which, isopentane 15.06%, isopentene 6.02%, isobutane 0.56%, n-butane 32.16%, trans-butene 12.82%, n-butene 5.02%, isobutene 0.21%, cis Butene 4.64%, acetic acid 11.52%, sec-butyl acetate 11.99%. Through separation, about 709g / h of carbon five components can be obtained, which contains 28.63% of isopentene and 71.37% of isopentane. The total conversion rate of isopentane is calculated to be 29.72%, and the total selectivity of isopentene is 97.58% %.

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PUM

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Abstract

The invention provides a method for preparing isopentene by using isopentane as a starting material. Mix isopentane and butene, dissolve in appropriate amount of organic acid, and convert isopentane into isopentene under the action of acidic catalyst. The reaction material can be separated to obtain a mixed carbon five product rich in isopentene, and organic acid sec-butyl ester can also be produced by-product. The conversion reaction condition is mild, the energy consumption is low, the process is simple, the requirements for equipment and facilities are low, and the production cost can be significantly reduced.

Description

technical field [0001] The invention relates to a method for preparing isopentene by using isopentane as a starting material. Background technique [0002] Isopentane, also known as 2-methylbutane, has the chemical formula C 5 h 12 , is a colorless, transparent, volatile liquid with a pleasant aromatic odor. Mainly used in organic synthesis, but also as a solvent. [0003] Isopentene is a general term for 2-methyl-2-butene and 2-methyl-1-butene, and its chemical formula is C 5 h 10 , is a colorless and volatile liquid with an unpleasant smell, insoluble in water, soluble in most organic solvents such as ethanol, and is a low flash point flammable liquid. As an important organic intermediate, isopentene is mainly used in industry to produce gasoline anti-knock agent TAME (methyl tert-amyl ether) through etherification reaction with methanol; it can also be used to produce flavor enhancers, spices, Protective agents for crops, such as tert-amylphenol and 2,4-di-tert-amyl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C5/52C07C11/10C07C67/04C07C69/14C07C69/24
CPCC07C5/52C07C67/04C07C2531/10C07C2527/188C07C2531/08C07C11/10C07C69/14C07C69/24
Inventor 刘良会肖云飞刘郁东
Owner HUNAN ZHONGCHUANG CHEM