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Method and device for separating C9 aromatic hydrocarbon mixture

A technology of carbon-nine aromatics and mixtures, which is applied in the field of separation of polymethyl aromatics, can solve problems such as waste of resources, achieve comprehensive utilization, wide product application range, and increase added value

Pending Publication Date: 2021-01-22
成都宏鼎石化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, there are generally no more than three components that can form economic value. The current technology only extracts one component of mesitylene, and the rest of the components are used as raw materials for aromatic solvents or other uses, and most of them have high economic value. Due to the limitations of technology and equipment, the components are not well separated and purified, resulting in a great waste of resources

Method used

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  • Method and device for separating C9 aromatic hydrocarbon mixture
  • Method and device for separating C9 aromatic hydrocarbon mixture
  • Method and device for separating C9 aromatic hydrocarbon mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] According to the following steps, in the refinery reforming carbon nine-heavy aromatics raw materials, we can separate unsytrimethylbenzene, mesitylene, trimethylbenzene and by-product o-methylethylbenzene:

[0101] (1) Send the reformed carbon nine-heavy aromatics raw material from the refinery into the first light removal tower 2 at a feed rate of 10t / h. The operating conditions of the first light removal tower 2 are kettle temperature 133°C, top temperature 100 ℃; top pressure 15KPa.A; reflux ratio 3.5; the amount of light components output by the light component transfer pump 3 is 1.65t / h, the amount sent by the first light removal tower kettle transfer pump 4 to the removal of mesitylene tower 5 is 8.35t / h;

[0102] (2) The operating conditions of the mesitylene removal tower 5 are: kettle temperature 138°C, top temperature 111°C; top pressure 7KPa.A; reflux ratio 4.5; enriched mesitylene component that is exported by the mesitylene delivery pump 6 The amount sent...

Embodiment 2

[0130] Compared with Example 1, the difference is that the mol ratio of trimethyl trimesate and n-octanol in the extraction solvent of step (4) is 3:1.

[0131] Three kinds of final products and one kind of by-product are detected to gained, and the result is:

[0132] The purity of trimethylbenzene in the final product is 99.29% (wt);

[0133] The purity of mesitylene in the final product is 98.63% (wt);

[0134] The purity of trimethylbenzene in the final product is 99.10% (wt);

[0135] The purity of the by-product o-methylethylbenzene is 93.28% (wt).

[0136] Compared with Example 1, the mesitylene yield drops (relative to the content in the raw material) to 80.29%, a decline of 6.42%; the o-methylethylbenzene yield drops (relative to the content in the raw material) about 10%.

Embodiment 3

[0138] Compared with Example 1, the difference is that the mol ratio of trimethyl trimesate and n-octanol in the extraction solvent of step (4) is 5:1.

[0139] Three kinds of final products and one kind of by-product are detected to gained, and the result is:

[0140] The purity of trimethylbenzene in the final product is 99.25% (wt);

[0141] The purity of mesitylene in the final product is 98.68% (wt);

[0142] The purity of trimethylbenzene in the final product is 99.20% (wt);

[0143] The purity of the by-product o-methylethylbenzene is 95.61% (wt).

[0144] Compared with Example 1, the mesitylene yield rises (relative to the content in the raw material) to 86.92%, an increase of 0.21%; the o-methylethylbenzene yield rises (relative to the content in the raw material) by about 1%; but the energy of the whole device Consumption increased by about 6.5%, showing a relatively large negative correlation in the economy. And the purity of the mesitylene product drops below 9...

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Abstract

The invention belongs to the technical field of separation of polymethyl aromatic hydrocarbon compounds, and particularly relates to a method and a device for separating a C9 aromatic hydrocarbon mixture. The method comprises the following steps: introducing a C9 aromatic hydrocarbon mixture from which light components with a boiling point lower than 164.5 DEG C and heavy components with a boilingpoint higher than 165.5 DEG C are removed into an extractive distillation tower, and carrying out extractive distillation in the presence of a first extractant which is a mixed solution of trimethyltrimellitate and n-octyl alcohol. According to the method and the device provided by the invention, effective components in refinery byproduct resources can be separated and purified, the applicationrange of the product is wide, the additional value is greatly improved, and the comprehensive utilization of precious resources is realized.

Description

technical field [0001] The invention belongs to the technical field of separation of polymethyl aromatic hydrocarbons, and in particular relates to a method and device for separating a mixture of carbon and nine aromatic hydrocarbons. Background technique [0002] A large refinery aromatics complex has a large amount of reformed carbon nine-fold aromatics resources, and its composition is complex, usually with more than forty components, and different components have different uses. Among them, there are generally no more than three components that can form economic value. The current technology only extracts one component of mesitylene, and the rest of the components are used as raw materials for aromatic solvents or other uses, and most of them have high economic value. Due to the limitations of technology and equipment, the components are not well separated and purified, resulting in a great waste of resources. Contents of the invention [0003] Aiming at the deficienc...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C7/04C07C7/08C07C15/02
CPCC07C7/005C07C7/04C07C7/08C07C15/02
Inventor 尤学民曹兵李佳林张娅
Owner 成都宏鼎石化有限公司
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