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Production method for high-purity n-hexane

A production method and technology of n-hexane, which is applied in the production field of high-purity n-hexane, can solve problems such as acid corrosion and oxidation reaction, and achieve the effects of reasonable energy consumption, high product purity, and low equipment requirements

Active Publication Date: 2015-11-25
SINOPEC GUANGZHOU ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] N-methylpyrrolidone is a colorless transparent oily liquid with a slight amine smell, melting point -24.4°C, boiling point 203°C, NMP has excellent selectivity and solubility for n-hexane-methylcyclopentane, NMP chemical properties Stable, under the protection of inert gas, the stability of N-methylpyrrolidone is still very good even above 315°C, but if it is exposed to air during production and storage, it is prone to oxidation reaction; in the presence of water and oxygen , above 175°C, NMP peroxide decomposes, and even hydrolyzes to generate 4-methylaminobutyric acid, causing acid corrosion

Method used

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  • Production method for high-purity n-hexane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]The crude hexane after reforming raffinate was hydrogenated to remove impurities and separated was used as raw material. The composition of the raw material is shown in Table 1. After rectification and separation in the deisohexane tower 1, the composition of the tower top component and the tower bottom component is shown in Table 2. The theoretical plate number of the deisohexane tower 1 is 90, the operating pressure (table) is 0.06MPa, and the tower top temperature is 79°C. The temperature at the bottom of the tower is 95°C, the light and crude n-hexane is removed and enters the middle and lower part of the extractive distillation tower 2, and the circulating solvent dioctyl phthalate enters the middle and upper part of the extractive distillation tower 2 for extractive distillation operation, and the top product Be normal hexane, the product at the bottom of the tower is a rich solvent, the composition is shown in Table 3, the number of theoretical plates of the extrac...

Embodiment 2

[0040] The crude hexane obtained by hydrogenating the reformed raffinate to remove impurities and then separated was used as the raw material, and the composition of the raw material was the same as that in Example 1. Through rectifying separation of deisohexane tower 1, the composition of tower top component and tower bottom component is shown in Table 5, and deisohexane tower 1 operating conditions: theoretical plate number 75, operating pressure (table) 0.05MPa, tower top temperature 78°C, the temperature at the bottom of the tower is 92°C, light and crude n-hexane enters the middle and lower part of the extractive distillation tower 2, and the circulating solvent (DOP) enters the middle and upper part of the extractive distillation tower 2 for extractive distillation, and the top product is Normal hexane, the product at the bottom of the tower is a rich solvent, the composition is shown in Table 6, the number of theoretical plates of the extractive distillation tower 2 is 5...

Embodiment 3

[0049] The crude hexane obtained by hydrogenating the reformed raffinate to remove impurities and then separated was used as the raw material, and the composition of the raw material was the same as that in Example 1. Through rectifying separation of deisohexane tower 1, the composition of tower top component and tower bottom component is shown in Table 8, and deisohexane tower 1 operating conditions: theoretical plate number 80, operating pressure (table) 0.1MPa, tower top temperature 87°C, the temperature at the bottom of the tower is 100°C, light and crude n-hexane is removed and enters the middle and lower part of extractive distillation tower 2, and the circulating solvent (DOP) enters the middle and upper part of extractive distillation tower 2 for extractive distillation operation, and the top product is High-purity n-hexane, the product at the bottom of the tower is a rich solvent, the composition is shown in Table 9, the number of theoretical plates of the extractive d...

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Abstract

The invention discloses a production method for high-purity n-hexane. According to the method, a raw material (8) is rectified and separated in an isohexane removal tower (1), so a tower bottom component (7) of the isohexane removal tower (1) is obtained; the tower bottom component (7) of the isohexane removal tower (1) enters an extracting and rectifying tower (2) and has countercurrent contact with a circulation solvent so as to realize extraction and rectification; a tower top product (9) of the extracting and rectifying tower (2) enters an n-hexane re-evaporation tower (5); a tower top component of the n-hexane re-evaporation tower (5) is high-purity n-hexane (14), and a tower bottom component (11) of the n-hexane re-evaporation tower (5) enters a solvent recovery tower (3); a tower bottom rich solvent (10) of the extracting and rectifying tower (2) enters the solvent recovery tower (3) for solvent recovery; and a tower bottom circulation solvent (13) of the solvent recovery tower (3) returns to the extracting and rectifying tower (2) for cyclic usage. The method has the advantages of high n-hexane purity and low energy consumption.

Description

technical field [0001] The present invention relates to a production method of high-purity polymerization-grade n-hexane in petrochemical industry, that is, straight-run, oilfield light hydrocarbons or reformed raffinate are hydrogenated to remove impurities and then separated to obtain n-hexane with a mass fraction of 60% to 60%. 90% of crude n-hexane is used as a raw material, and dioctyl phthalate is used as an extraction solvent for extraction and rectification, and the product is purified to obtain a production method of high-purity n-hexane. Background technique [0002] Hexane is one of the most widely used hydrocarbon solvents in industry and is the most representative non-polar solvent. As an important chemical raw material and solvent, n-hexane has been widely used in industries such as medicine, chemical industry, polymer materials, rubber industry and food analysis. The reformed raffinate is hydrogenated to remove impurities and then separated to obtain crude n-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/15C07C7/04C07C7/08
Inventor 孙秋荣汤红年
Owner SINOPEC GUANGZHOU ENG
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