Method for increasing yield of BTX aromatics

A BTX aromatics, aromatics technology, applied in chemical instruments and methods, bulk chemical production, hydrocarbons, etc., can solve the problem of low non-aromatic utilization value, improve the added value of products, achieve significant technical effects, and realize the heat of reaction. self-sufficiency effect

Active Publication Date: 2015-07-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that in the prior art, for low-aromatic mixtures, the traditional solvent extraction separation process only simply separates BTX aromatics, and a large amount of toluene, heavy aromatics and non-aromatics in the light aromatics products have low utilization value. The problem is to provide a new method for increasing the production of BTX, which has the advantages of simple separation of hydrocarbon raw materials, high added value of products, avoiding solvent extraction process, and high utilization value of non-aromatic hydrocarbons

Method used

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  • Method for increasing yield of BTX aromatics

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Effect test

Embodiment 1

[0023] with C 6 And the mixture of the above components is the raw material (the content of benzene is 24.4 tons / hour, the content of toluene is 9.3 tons / hour, the content of xylene is 2.1 tons / hour, and the content of ethylbenzene is 3.6 tons / hour). figure 1 Process technology increases production of BTX, of which benzene, toluene, C 9 +None cycle. Reaction unit, reaction pressure 2.8 MPa, reaction temperature 350°C, hydrogen partial pressure 1.4 MPa; stripping column is a 44-layer float valve tray, the operating pressure at the top of the tower is 0.7MPa, the control temperature of the top separator is 40°C, discharge Non-condensable gas, in which the molar concentration of ethane is 47.1%, the molar concentration of propane is 39.9%, and other light hydrocarbons are 13.0mol%. The benzene tower adopts 55 layers of valve trays, the operating pressure at the top of the tower is 0.05MPa, and 21 tons / hour of benzene products with a purity of 99.95wt% are obtained at the top o...

Embodiment 2

[0026] Highly non-aromatic cracking C 9 + As raw material (toluene content is 3.1 tons / hour), using figure 1 Process technology increases production of BTX, of which benzene, toluene, C 9 + None cycle. Reaction unit, reaction pressure 2.8 MPa, reaction temperature 340°C, hydrogen partial pressure 1.14 MPa; stripping tower is a 44-layer float valve tray, the operating pressure at the top of the tower is 0.7MPa, the control temperature of the top separator is 40°C, discharge Non-condensable gas, in which the molar concentration of ethane is 23.3%, the molar concentration of propane is 63.3%, and other light hydrocarbons are 13.4mol%. The benzene tower adopts 55 layers of valve trays, the operating pressure at the top of the tower is 0.05MPa, and 8.4 tons / hour of benzene product with a purity of 99.95wt% is obtained at the top of the tower. The toluene tower adopts 55 layers of valve trays, the operating pressure at the top of the tower is 0.05MPa, and 14.2 tons / hour of tolu...

Embodiment 3

[0029] to reform C 9 + as raw material (benzene content is 0 tons / hour, toluene content is 30.5 tons / hour, xylene content is 42.3 tons / hour, C 9 + Aromatics content is 504.5 tons / hour), using figure 1 Process technology increases production of BTX, of which benzene, toluene, C 9 + None cycle. Reaction unit, reaction pressure 2.6 MPa, reaction temperature 320°C, hydrogen partial pressure 1.04 MPa; stripping column is a 44-layer float valve tray, the operating pressure at the top of the tower is 0.7MPa, the control temperature of the top separator is 40°C, discharge Non-condensable gas, in which the molar concentration of ethane is 18.3%, the molar concentration of propane is 63.3%, and other light hydrocarbons are 18.4mol%. The benzene tower adopts 55 layers of valve trays, the operating pressure at the top of the tower is 0.05MPa, and 53.7 tons / hour of benzene product with a purity of 99.95wt% is obtained at the top of the tower. The toluene tower adopts 55 layers of va...

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Abstract

The invention relates to a method for increasing yield of BTX aromatics, and mainly solves the problem that in the prior art, the utilization value of heavy aromatics and non-aromatics is low. According to the invention, heavy components containing polycyclic aromatic compound or carbons higher than or equal to six containing are mixed with hydrogen, the mixture enters a fixed bed reactor containing a catalyst, so that dealkylation and alkyl shifting reactions are performed on heavy aromatics, isomerization reaction is performed on light aromatics, and hydrocracking and aromatisation reactions are performed on heavy non-aromatics; the obtained BTX-rich reaction products continuously pass through a vapour liquid separator, a stripping column, a benzene column, a toluene column, and a dimethyl benzene column; the products of liquefied gas, benzene, toluene, and dimethyl benzene are obtained. The technical scheme excellently solves the problem, and can be applied to the industrial production of aromatics.

Description

technical field [0001] The invention relates to a method for increasing the production of BTX aromatics. Background technique [0002] BTX is an important organic chemical basic raw material for petrochemical industry. BTX, B is benzene, T is toluene, X is xylene. With the global economic growth, BTX aromatics will continue to maintain market growth in the future. The main sources for the production of aromatics are catalytic reforming oil, gasoline, and coal tar. The content of aromatics in pyrolysis gasoline is as high as 60%, which is an important raw material for producing aromatics. As the international crude oil price fluctuates at a high level for a long time, the source of raw materials for ethylene cracking in my country has been diversified in recent years and has gradually become heavier, which will lead to an increase in the output of by-product pyrolysis gasoline and provide a raw material guarantee for increasing the production of BTX aromatics. [0003] He...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/04C07C15/06C07C15/08C07C4/18C07C5/41
CPCY02P20/52
Inventor 李木金杨卫胜贺来宾施德
Owner CHINA PETROLEUM & CHEM CORP
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