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Method and device for separating isohexane, n-hexane and benzene

A technology of n-hexane and isohexane, applied in chemical instruments and methods, hydrocarbon purification/separation, distillation purification/separation, etc., can solve the problems of waste of benzene resources and high energy consumption

Active Publication Date: 2015-07-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The method of catalytic hydrogenation to remove benzene in the n-hexane raw material is suitable for the case of low benzene content. When the benzene content is high, the use of this method will not only cause high energy consumption, but also cause waste of benzene resources

Method used

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  • Method and device for separating isohexane, n-hexane and benzene
  • Method and device for separating isohexane, n-hexane and benzene
  • Method and device for separating isohexane, n-hexane and benzene

Examples

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Embodiment 1

[0033] According to a separation method of isohexane, normal hexane and benzene of the present invention, when the mixed hydrocarbon raw materials such as raffinate, pyrolysis gasoline or straight-run gasoline from the aromatics extraction unit do not contain heavy components such as toluene, the separation process and Embodiment 1 is basically the same, first remove impurities with a lower boiling point than 2-methylpentane, and then separate benzene-free mixed hexane by extractive distillation. Mixed hexanes are further separated into isohexane products and n-hexane products. The material after removal of mixed hexane is separated by a subsequent extraction and rectification method to obtain a benzene product.

[0034] The process flow mainly includes the following units: light component removal unit, hexane extraction and rectification unit, hexane separation unit, first solvent recovery unit, benzene extraction and rectification unit, second solvent recovery unit and solve...

Embodiment 2

[0047] According to the separation method of a kind of isohexane, n-hexane and benzene of the present invention, the mixed hydrocarbon materials such as raffinate, pyrolysis gasoline or straight-run gasoline from the aromatics extraction unit first remove the boiling point of 2-methylpentane Low impurity, and then the benzene-free mixed hexane is separated by extractive distillation. Mixed hexanes are further separated into isohexane products and n-hexane products. The material after removal of mixed hexane is separated by a subsequent extraction and rectification method to obtain a benzene product. The difference between this example and Example 1 is that a benzene refining unit is used to obtain benzene products.

[0048] The process flow mainly includes the following units: light component removal unit, hexane extraction and rectification unit, hexane separation unit, first solvent recovery unit, benzene extraction and rectification unit, second solvent recovery unit, benz...

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Abstract

The invention relates to a method and device for separating isohexane, n-hexane and benzene. A rectifying and extractive distillation combined method is adopted. The device comprises a light component removing unit, a hexane extractive distillation unit, a hexane separating unit, a first solvent recovery unit, a benzene extractive distillation unit, a second solvent recovery unit and a solvent regenerating unit. Impurities with boiling point lower than that of 2-methyl pentane are firstly removed from the mixed hydrocarbon raw materials, such as raffinate oil, pyrolysis gasoline, straight distilling gasoline, from an aromatics extraction device, and then an extractive distillation method is adopted for separating the mixed hexane without benzene; the mixed hexane is further separated into an isohexane product and a n-hexane product; the material separated from the mixed hexane is separated by adopting the extractive distillation method, so that a benzene product is obtained; the total mass fraction of the isohexane product 2-methyl pentane and 3-methyl pentane is not less than 95% and the benzene content is less than 100ppm; and the n-hexane product meets the national standard GB16629-2008 and the mass fraction is not less than 99%.

Description

technical field [0001] The invention relates to a separation method and equipment for isohexane, n-hexane and benzene, in particular to a separation method combining ordinary rectification and extractive rectification. 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. As an extractant in the edible oil industry, it is required that the hexane solvent oil fraction should be as narrow as possible, and the benzene content should be as low as possible. These two indicators directly affect the quality, oil yield and energy consumption of edible oil. When n-hexane is used as a solvent for propylene polymerization, the less benzene content is required, the better. This is not only beneficial to increase the rate of polypropylene p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/04C07C9/15C07C9/16C07C7/00C07C7/04
Inventor 张敏华余英哲耿中峰马静李永辉董秀芹
Owner TIANJIN UNIV