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Separation method of multi-component aromatic hydrocarbons

A separation method and multi-component technology, applied in the field of separation of multi-component aromatic hydrocarbon raw materials, can solve the problem that polyester PTA cannot meet market needs, save equipment cost and floor space, eliminate back-mixing, and simplify long processes Effect

Active Publication Date: 2019-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the rapid development of polyester, it has been exposed that PTA, one of the main raw materials of polyester in my country, is far from meeting market needs.

Method used

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  • Separation method of multi-component aromatic hydrocarbons
  • Separation method of multi-component aromatic hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Combine below figure 1 Example 1 will be described.

[0036] Taking the separation of aromatics in the disproportionation unit as an example, the process flow is as follows figure 1 As shown, the raw material stream (S 1 ) flow rate is 1000kg / h, which contains 10% benzene, 35% toluene, 30% xylene, and 25% heavy aromatics. place. The number of theoretical plates of the first rectifying column is 100, the pressure at the top of the column is 150KPa, and the temperature at the top of the column is 89°C. The benzene component in the raw material is purified in the first rectifying tower I zone, and is extracted from the top of the tower to obtain the first product stream (S 4 ), wherein the benzene content is 0.999. The first sideline production stream (S 5 ) is the 60th theoretical plate, enters the bottom of the second rectifying tower, the stream temperature is 145°C, and the pressure is 180KPa. The number of theoretical plates of the second rectifying tower is 5,...

Embodiment 2

[0044] Combine below figure 1 Example 2 will be described.

[0045] Taking the separation of aromatics in the disproportionation unit as an example, the process flow is as follows figure 1 As shown, the raw material stream (S 1 ) flow rate is 800kg / h, which contains 10% benzene, 35% toluene, 30% xylene, and 25% heavy aromatics. place. The number of theoretical plates of the first rectifying column is 80, the pressure at the top of the column is 150KPa, and the temperature at the top of the column is 89°C. The benzene component in the raw material is purified in the first rectifying tower I zone, and is extracted from the top of the tower to obtain the first product stream (S 4 ), wherein the benzene content is 0.999. The first sideline production stream (S 5 ) is the 55th theoretical plate, enters the bottom of the second rectifying tower, the stream temperature is 149°C, and the pressure is 178KPa. The number of theoretical plates of the second rectifying tower is 15, ...

Embodiment 3

[0053] Combine below figure 1 Example 3 will be described.

[0054] Taking the separation of aromatics in the disproportionation unit as an example, the process flow is as follows figure 1 As shown, the raw material stream (S 1 ) flow rate is 1000kg / h, which contains 15% benzene, 30% toluene, 25% xylene, and 30% heavy aromatics. place. The number of theoretical plates of the first rectifying column is 80, the pressure at the top of the column is 150KPa, and the temperature at the top of the column is 89°C. The benzene component in the raw material is purified in the first rectifying tower I zone, and is extracted from the top of the tower to obtain the first product stream (S 4 ), wherein the benzene content is 0.999. The first sideline production stream (S 5 ) is the 50th theoretical plate, enters the bottom of the second rectifying tower, the stream temperature is 152°C, and the pressure is 175KPa. The number of theoretical plates of the second rectifying tower is 30,...

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Abstract

The invention relates to a benzene-toluene-xylene-heavy aromatics separating method. The method is characterized in that multiple components of benzene, toluene, xylene, C9 and heavy aromatics are introduced into a first rectifying tower, the rectifying tower kettle is heated, and a first product benzene is extracted from the top of the tower. Two gas phase material flows extracted from different positions at intermediate section of the first rectifying tower are respectively introduced into the bottom of a second rectifying tower and a third rectifying tower which have no arrangement of a reboiler, a second product toluene and a third product xylene are respectively extracted from the top of the tower, the liquid phase material flow at the bottom of the second rectifying tower and the third rectifying tower enables backflow into the first rectifying tower, and a fourth product heavy aromatics extracted from the bottom of the first rectifying tower. Compared with a traditional sequence separating technology, The method has the advantages of low investment and low energy consumption, and can be used for industrial separation of benzene-toluene-xylene-heavy aromatics.

Description

technical field [0001] The invention relates to a method for separating multi-component aromatic hydrocarbons, in particular to a method for separating multi-component aromatic hydrocarbon raw materials containing benzene, toluene, xylene and heavy aromatic hydrocarbons. Background technique [0002] Benzene, toluene, and xylene are important organic chemical raw materials. A series of compounds produced by benzene (B) through substitution reactions, addition reactions, and oxidation reactions can be used to prepare plastics, rubber, fibers, dyes, detergents, Insecticides, etc.; a series of intermediates derived from toluene (T) are widely used in the production of fine chemicals such as dyes, medicines, pesticides, explosives, auxiliaries, spices, etc., and are also used in the synthetic material industry; xylene (X ) is an important raw material in the polyester industry, and has a wide range of uses in many chemical production fields such as chemical fibers, synthetic res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/04C07C15/04C07C15/06C07C15/08C07C15/02
Inventor 曹君杨卫胜贺来宾
Owner CHINA PETROLEUM & CHEM CORP
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