Thermal coupling system and method for extractive distillation of normal hexane, isohexane and benzene

A technology for extractive distillation and extractive distillation column, which is applied in the field of reducing the heat coupling system of n-hexane, isohexane and benzene extractive distillation, can solve the problems of low product purity and high energy consumption

Active Publication Date: 2013-05-22
TIANJIN UNIV
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Problems solved by technology

The yield of azeotropic distillation is high, but the purity of the product obtained is not high
The product purity of the extractive distillation method is higher, up to 99%, and has a highe...

Method used

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  • Thermal coupling system and method for extractive distillation of normal hexane, isohexane and benzene

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Embodiment Construction

[0012] Several connections of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0013] A thermal coupling system for n-hexane, isohexane and benzene extraction and rectification system, comprising light removal tower 101, isohexane purification tower 105, n-hexane rectification tower 108, first solvent recovery tower 113, and benzene extraction and rectification tower 116 It is composed of the second solvent recovery tower 118; each tower bottom is provided with a reboiler; it is characterized in that a feed preheater 103 is provided before the light removal tower 101, and the second solvent recovery tower 118 tower kettle and the light removal tower Feed preheater 103, feed preheater 104 and benzene extractive distillation tower 116 are connected in sequence; The tower still of 113, the reboiler 107 of isohexane purification tower, the solvent cooler 115 of n-hexane rectification tower and the n-hexane rectificati...

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Abstract

The invention relates to a thermal coupling method for extractive distillation of normal hexane, isohexane and benzene. A rectifying tower consists of a dehydrating tower, an isohexane tower, a normal hexane extractive distillation tower, a first solvent recovery tower, a benzene extractive distillation tower and a second solvent recovery tower. Residue of the second solvent recovery tower respectively exchange heat with fed materials of the dehydrating tower and the benzene extractive distillation tower. Residue of the first solvent recovery tower is a heating medium of a reboiler of the isohexane tower, and products at the tops of the normal hexane extractive distillation tower and the benzene extractive distillation tower enter an argil adsorbent bed via two plate heat exchangers which are of all-welded type, so that all counter-current operation is realized. One of the plate heat exchanger uses the material discharged from the argil adsorbent bed as a heating medium, and all stream heats are adequately utilized. According to the invention, the power energy of the rectifying unit is greatly reduced, the production cost of the normal hexane is lowered, and the market competitiveness is improved.

Description

technical field [0001] The invention relates to a thermal coupling method capable of reducing energy consumption of a n-hexane, isohexane and benzene separation device, in particular to a thermal coupling system and method capable of reducing the extraction and rectification of n-hexane, isohexane and benzene. Background technique [0002] n-Hexane is a colorless transparent liquid, one of the widely used hydrocarbon solvents, and the most representative non-polar solvent. Industrial hexane solvent oil can be used in industries such as medicine, chemical industry, polymer materials, rubber industry and food. The market demand for n-hexane products is large. [0003] The main method of industrial production of n-hexane is: first obtain crude n-hexane from straight-run or raffinate by rectification or hydrogenation of platinum reformed raffinate, and then undergo molecular sieve adsorption and intermittent azeotropic distillation , extractive distillation and other methods t...

Claims

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Application Information

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IPC IPC(8): C07C7/08C07C9/15C07C9/16C07C15/04
CPCY02P20/51Y02P20/10Y02P20/50
Inventor 张敏华耿中峰马静余英哲李永辉董秀芹
Owner TIANJIN UNIV
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