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Novel process and device for separating normal hydrocarbons and isomeric hydrocarbons by reaction-separation coupling

A technology for reaction separation coupling and isomeric hydrocarbons, which is applied in the purification/separation of hydrocarbons, hydrocarbons, chemical instruments and methods, etc. It can solve the problems of high cost, difficult distillation and separation, and high energy consumption for desorbent recovery. , to achieve the effect of low energy consumption and equipment cost, improve market competitiveness, and improve utilization value

Active Publication Date: 2018-12-28
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, due to the close boiling points of normal hydrocarbons and isomeric hydrocarbons with the same carbon number, it is difficult to separate by rectification, and the energy consumption is high; adsorption separation has defects such as high energy consumption of desorbent recovery, difficult regeneration, etc.; membrane separation has difficulties in the selection of membrane materials , high cost issues

Method used

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  • Novel process and device for separating normal hydrocarbons and isomeric hydrocarbons by reaction-separation coupling
  • Novel process and device for separating normal hydrocarbons and isomeric hydrocarbons by reaction-separation coupling
  • Novel process and device for separating normal hydrocarbons and isomeric hydrocarbons by reaction-separation coupling

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Embodiment 1

[0045] The present invention is used in the separation process of normal hydrocarbon and isohydrocarbon in Fischer-Tropsch synthetic light oil, such as figure 1 Shown, including crystallization reactor (R1), mixer (M2), filter (F3), rectification tower (T4), phase separator (D5), evaporator (E6), second phase separator (D7) ), condenser, reboiler, pump and related feed lines and lines connecting the above equipment. The raw material is 50g cut from Fischer-Tropsch synthetic oil light oil and removes oxygenated C5 narrow fractions. It contains various C5 hydrocarbons, mainly including normal alkanes and α-olefins, as well as some isoparaffins, internal Olefins, branched olefins, and a small amount of cycloalkanes, aromatics, and cycloalkenes. Add 1-ethyl-3-methylimidazole tetrafluoroborate [EMIM][BF4] urea modified with ionic liquid, ie {CO(NH2)2-[EMIM][BF4]} as the reactant and activator It is tetrahydrofuran (THF), the ratio of reactant, activator and water is 30g:30ml:10ml; ...

Embodiment 2

[0048] The present invention is used in the separation process of normal hydrocarbon and isohydrocarbon in Fischer-Tropsch synthetic light oil, such as figure 2 Shown, including crystallization reactor (R1), mixer (M2), filter (F3), rectification tower (T4), phase separator (D5), evaporator (E6), second phase separator (D7) ), condenser, reboiler, pump and related feed lines and lines connecting the above equipment. The raw material is 50g of C6 narrow cut from Fischer-Tropsch synthetic light oil and removes oxygenated compounds. It contains various C6 hydrocarbons, mainly including normal alkanes and α-olefins, as well as some isoparaffins, internal Olefins, branched olefins, and a small amount of cycloalkanes, aromatics, and cycloalkenes. Add 1-butyl-3-methylimidazole tetrafluoroborate [BMIM][BF4] thiourea modified by ionic liquid, namely {S(NH2)2-[EMIM][BF4]} as the reactant to activate The agent is dimethyl sulfoxide (DMSO), and sodium chloride is added as an auxiliary ag...

Embodiment 3

[0051] The present invention is used in the separation process of normal hydrocarbon and isohydrocarbon in Fischer-Tropsch synthetic light oil, such as image 3 Shown, including crystallization reactor (R1), mixer (M2), filter (F3), rectification tower (T4), phase separator (D5), evaporator (E6), second phase separator (D7) ), condenser, reboiler, pump and related feed lines and lines connecting the above equipment. The raw material is 50g of C8 narrow cut obtained by cutting Fischer-Tropsch synthetic light oil and removing oxygenated compounds. It contains various C8 hydrocarbons, mainly including normal alkanes and α-olefins, as well as some isoparaffins, internal Olefins, branched olefins, and a small amount of cycloalkanes, aromatics, and cycloalkenes. Add bromide-N-ethylpyridine [EPy][Br] urea modified with ionic liquid, ie {CO(NH2)2-[EPy][Br]} as the reactant, the activator is dimethyl sulfoxide (DMSO) ), and add sodium chloride as auxiliary agent, the ratio of reactant,...

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Abstract

The invention relates to a novel process and device for separating normal hydrocarbons and isomeric hydrocarbons by reaction-separation coupling. By utilizing the difference between molecular structures of the normal hydrocarbons and the isomeric hydrocarbons, a reactant is added by means of a reaction-separation coupling method to make one class to be precipitated in the form of a complex crystal. After separation and purification, normal hydrocarbon products and isomeric hydrocarbon products are obtained respectively. After separation and purification by the process, the mass content of thenormal hydrocarbon products and the isomeric hydrocarbon products can reach more than 99%, and the recovery rate can reach more than 95%. The novel process and device have the advantage that the reaction crystallization coupling method is adopted, and the difference between the molecular structures of the normal hydrocarbons and the isomeric hydrocarbons is utilized to convert a difficult problemof separating the normal hydrocarbons and the isomeric hydrocarbons with the close boiling point, relatively low volatilization and same carbon number into a problem of solid and liquid separation easy to solve. The effective separation is achieved to obtain the normal hydrocarbon products and the isomeric hydrocarbon products respectively.

Description

Technical field [0001] The invention relates to a method for separating normal hydrocarbons and isohydrocarbons, that is, a reaction separation coupling method, which is suitable for the separation of normal hydrocarbons and isohydrocarbons in petrochemical and coal chemical industries, and is especially suitable for Fischer-Tropsch synthetic oil C5- Separation of normal hydrocarbons and iso-hydrocarbons with the same carbon number in C12 narrow fractions. technical background [0002] Naphtha is a light oil used for chemical raw materials produced by processing crude oil or other raw materials, and is a mixture of various hydrocarbons. At present, its main uses are: as a raw material for ethylene cracking; as a raw material for catalytic reforming; to produce high-octane gasoline; as a gasoline blender. Normal hydrocarbons and isohydrocarbons have different properties and uses due to structural differences. When directly used as a raw material for ethylene cracking, the isopar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C9/15C07C9/16
CPCC07C7/005C07C9/15C07C9/16
Inventor 高鑫赵悦李洪李鑫钢
Owner TIANJIN UNIV
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