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Method for extracting and separating liquid olefin and alkane mixture by adopting functional ionic liquid

An alkane mixture and ionic liquid technology, applied in the field of chemical engineering, can solve the problems of high energy consumption, separation of olefins and solvents, high stability and large-scale application, etc., to improve separation efficiency, improve separation effect, and facilitate recycling and reuse. Effect

Active Publication Date: 2014-04-23
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patent CN1338449A introduces the cryogenic separation method to recover ethylene and ethane from the mixed gas containing hydrocarbons, but it needs to be carried out at low temperature and high pressure, and the energy consumption is relatively large
[0015] However, due to the volatility of organic solvents, the addition of organic solvents to ionic liquids can increase the mass transfer rate of olefins in them, but it causes the separation of olefins and solvents, and the stability and high cost of ionic liquids containing metal ions are also insufficient. Limits the large-scale application of ionic liquids containing metal ions in the extraction and separation of alkenes and alkanes

Method used

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  • Method for extracting and separating liquid olefin and alkane mixture by adopting functional ionic liquid

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Effect test

Embodiment 1

[0047] The mixture of cyclopentene and cyclopentane is used as the raw material liquid, and the molar ratio of cyclopentene and cyclopentane in the raw material liquid is 1:1, and the cyano functionalized ionic liquid [CPmim][NTf 2 ] (1-cyanopropyl-3-methylimidazole bis(trifluoromethanesulfonyl)imide salt) is the extractant, and cyclopentane is the detergent, the flow ratio of the extractant, the detergent, and the raw material solution It is 5: 2.7: 1, and the fractionation extraction is carried out in the fractionation extraction device at 10°C, specifically as figure 1 As shown, the fractional distillation extraction is divided into an extraction section and a washing section. There are 19 stages in the extraction section and 14 stages in the washing section. Fractional distillation extraction system, the detergent enters the fractionation extraction system from the first stage of the washing section, and the raw material liquid is combined into the extraction section at th...

Embodiment 2

[0049] The mixture of 1-octene and n-octane is used as the raw material liquid, and the molar ratio of 1-octene and n-octane in the raw material liquid is 1:8, and the functionalized ionic liquid [CONmim][NTf 2 ] (1-acetamido-3-methylimidazole bis(trifluoromethanesulfonyl)imide salt) is the extractant, with n-octane as the detergent, the flow ratio of the extractant, detergent, and raw material solution It is 10:5:1, and the fractionation extraction is carried out in the fractionation extraction device at 40°C, specifically as figure 1 As shown, the fractional distillation extraction is divided into an extraction section and a washing section. There are 22 stages in the extraction section and 16 stages in the washing section. Fractional distillation extraction system, the detergent enters the fractionation extraction system from the first stage of the washing section, and the raw material liquid is combined into the extraction section at the last stage of the extraction sectio...

Embodiment 3

[0051] With the mixture of 1-hexene and n-hexane as the raw material liquid, the molar ratio of 1-hexene and n-hexane in the raw material liquid is 1:1, and the alkenyl functionalized ionic liquid [Apy][NTf 2 ](N-allylpyridine bis(trifluoromethanesulfonyl)imide salt) is the extractant, with n-hexane as the detergent, the flow ratio of the extractant, detergent, and raw material solution is 6:2.7:1 , carry out fractionation extraction in the fractionation extraction device at 20°C, specifically as figure 1 As shown, the fractional distillation extraction is divided into an extraction section and a washing section. There are 16 stages in the extraction section and 10 stages in the washing section. Fractional distillation extraction system, the detergent enters the fractionation extraction system from the first stage of the washing section, and the raw material liquid is combined into the extraction section at the last stage of the extraction section. Flow out the extract rich i...

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Abstract

The invention discloses a method for separating a liquid olefin and alkane mixture by adopting a functional ionic liquid. In the method, high-purity olefin is separated efficiently from an olefin and alkane mixture with a fractional extraction method by taking a liquid olefin and alkane mixture as a raw material liquid, taking an ion liquid of which cation is substituted by an unsaturated functional group and taking olefin as a washing agent. The method has the advantages of high separating efficiency, low solvent consumption, safety, environment friendliness, easiness for industrial production and the like, and the content of the obtained product olefin is higher than 98 percent.

Description

technical field [0001] The invention relates to the separation and purification of olefins, which belongs to the technical field of chemical engineering, in particular to a method for obtaining high-purity olefins by extracting and separating them from mixtures of olefins and alkanes by using functionalized ionic liquids. Background technique [0002] Olefin is an important basic chemical raw material, which can be used to synthesize polymers and other chemicals, and has high industrial application value. Among them, the ethylene industry, as a pillar industry of the petrochemical industry, has always occupied an important position in the national economy. Ethylene output and production level are used as indicators to measure the development level of a country or region's petrochemical industry. The scale, cost, production stability and product quality of ethylene production play a dominant role in the entire petrochemical complex. Hexene also has high industrial applicati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/10
Inventor 邢华斌李如龙杨启炜苏宝根鲍宗必杨亦文任其龙
Owner ZHEJIANG UNIV
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