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Method for producing 1,2,4-trimethylbenzene by C9 aromatic hydrocarbon isomerization

A technology for the isomerization of trimethylene and aromatic hydrocarbons, which can be used in the fields of isomerization to produce hydrocarbons, organic chemistry, etc., and can solve the problem of high production costs

Active Publication Date: 2012-01-04
JIANGSU ZHENGDAN CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcoming is that: because C9 aromatics also contain a large amount of other components, although from the perspective of the industrial chain, the by-products after rectification can still be reused, as a manufacturer of trimethylbenzene, there may not be all Complete production equipment for downstream products corresponding to by-products, therefore, some of the remaining products after rectification can only be sold to other manufacturers at low prices
Leading to higher production costs for manufacturers

Method used

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  • Method for producing 1,2,4-trimethylbenzene by C9 aromatic hydrocarbon isomerization
  • Method for producing 1,2,4-trimethylbenzene by C9 aromatic hydrocarbon isomerization
  • Method for producing 1,2,4-trimethylbenzene by C9 aromatic hydrocarbon isomerization

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Embodiment 1

[0018] The method for producing trimethylbenzene by isomerization of C9 aromatic hydrocarbons, the steps are as follows:

[0019] 1) The C9 aromatics produced by petroleum cracking with a purity greater than or equal to 90% are delightened in the light removal tower 1, and the working temperature of the light removal tower 1 is controlled at 166°C~168°C (because it is difficult to control the temperature at a certain Therefore, it is appropriate as long as it fluctuates within a certain range, the same below), so that o-methylethylbenzene, m-methylethylbenzene, p-methylethylbenzene, mesitylene, and n-propyl ethylbenzene with a boiling point lower than 166°C After benzene and cumene are vaporized and leave the light removal tower 1 from the top of the tower, they enter the first rectification tower 2; the unisexylene and trimethylbenzene with a boiling point higher than 168°C retained at the bottom of the light removal tower 1 are sent to the second distillation tower. Second d...

Embodiment 2

[0025] The method for producing trimethylbenzene by isomerization of C9 aromatic hydrocarbons, the steps are as follows:

[0026] 1) The C9 aromatics produced by petroleum cracking with a purity greater than or equal to 90% are subjected to light removal treatment in the light removal tower 1, and the working temperature of the light removal tower 1 is controlled at 166°C~168°C (so that the adjacent boiling point is lower than 166°C) Methylbenzene, m-methylethylbenzene, p-methylethylbenzene, mesitylene, n-propylbenzene and isopropylbenzene are vaporized and leave the light removal tower 1 from the top of the tower, and then enter the first rectification tower 2; the bottom of the light removal tower 1 is retained Pyrylene and trimethylbenzene whose boiling point is higher than 168°C are transported to the second rectification tower 3;

[0027] 2) In the second rectification tower 3, the rectification temperature is 169.5°C to 175°C, and the trimethylbenzene leaves from the top...

Embodiment 3

[0032] The method for producing trimethylbenzene by isomerization of C9 aromatics, the steps are as follows:

[0033] 1) The C9 aromatics with a purity greater than or equal to 90% after extraction of mesitylene are subjected to light removal treatment in the light removal tower 1, and the working temperature of the light removal tower 1 is controlled at 166°C~168°C (so that the boiling point is lower than 166 The o-methylethylbenzene, m-methylethylbenzene, p-methylethylbenzene, mesitylene, n-propylbenzene and cumene at ℃ are vaporized and leave the light removal tower 1 from the top of the tower, and then enter the first rectification tower 2; Pyrylene and trimethylbenzene with a boiling point higher than 168°C retained at the bottom of the tower are sent to the second rectification tower 3;

[0034] 2) In the second rectification tower 3, the rectification temperature is 169.5°C to 175°C, and the trimethylbenzene leaves from the top of the second rectification tower 3 and is...

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Abstract

The invention discloses a method for producing 1,2,4-trimethylbenzene by C9 aromatic hydrocarbon isomerization, belonging to the technical field of chemical industry. The method comprises the following steps of: dehydrogenizing the C9 aromatic hydrocarbon; then conveying hemimelitene, mesitylene and o-methyl ethylbenzene which are obtained by rectifying into an isomerization reactor; carrying outa catalysis reaction at a temperature in a range of 260-410 DEG C under 0.2-3.5 Mpa; isomerising parts of the hemimelitene and the mesitylene to form 1,2,4-trimethylbenzene; and rectifying and separating to obtain the 1,2,4-trimethylbenzene. The conversion per pass of the method provided by the invention can reach 45% and the method can produce much more 1,2,4-trimethylbenzene by utilizing the C9aromatic hydrocarbon.

Description

technical field [0001] The invention relates to a production method of chemical products, in particular to a production method of metatrimethylbenzene, and belongs to the technical field of chemical industry. Background technique [0002] C9 aromatics, also known as heavy aromatics, is a composition of various aromatics containing 9 carbon atoms. Its molecular formula is C9H12. C9 aromatics are by-products produced during crude oil processing, mainly from reforming units and cracking units in refineries. . C9 aromatics contain a large amount of trimethylbenzene, mesitylene, para-trimethylbenzene, o-methylethylbenzene, m-methylethylbenzene, p-methylethylbenzene, n-propylbenzene and cumene, among which The total content is about 80%, which is a valuable resource for the development of fine chemicals and has high added value. However, trimethylbenzene (1, 2, 4-trimethylbenzene) accounts for about 35%-40% of C9 aromatics. Since the boiling point of trimethylbenzene is 169.4°C,...

Claims

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Application Information

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IPC IPC(8): C07C15/02C07C5/27
Inventor 曹正国周爱华荆晓平任伟钱勤华
Owner JIANGSU ZHENGDAN CHEM IND CO LTD
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