Mixed solvent based on ionic liquid and used for C5 separation

A technology of ionic liquids and mixed solvents, applied in distillation purification/separation, bulk chemical production, organic chemistry, etc., can solve the problems of poor solvent selectivity, reduce solvent ratio, reduce production cost, and reduce extractive distillation trays number effect

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of poor solvent selectivity in the prior art, the present invention provides a mixed solvent for separation of C5 based on ionic liquid, which can increase the relative volatility between the components of C5 and improve the solvent selectivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] At room temperature, add 900 grams of N-methylpyrrolidone (NMP, produced by Shanghai Fusen Chemical Co., Ltd.) in a 1-liter beaker, and then add 100 grams of ionic liquid 1-butyl-3-methylimidazolium tetrafluoroboron salt (produced by Shanghai Chengjie Chemical Co.), stirred for 10 minutes, and mixed evenly; the weight ratio of NMP to 1-butyl-3-methylimidazolium tetrafluoroborate was 90:10.

Embodiment 2

[0020] At room temperature, add 850 grams of N-methylpyrrolidone (NMP, produced by Shanghai Fusen Chemical Co., Ltd.) in a 1-liter beaker, and then add 50 grams of ionic liquid 1-butyl-3-methylimidazolium tetrafluoroboron salt (produced by Shanghai Chengjie Chemical Company), then add 100 grams of water, stir for 10 minutes, and mix well;

[0021] The weight ratio of NMP to 1-butyl-3-methylimidazolium tetrafluoroborate was 85:5.

Embodiment 3

[0023] The preparation method is the same as in Example 1, and 950 grams of dimethylformamide (DMF, produced by Shanghai Langrui Fine Chemicals Co., Ltd.), 50 grams of 1-ethyl-3-methylimidazolium bromide (produced by Liyang Dongjiao Chemical Factory) are taken. gram, stir and mix evenly; the weight ratio of DMF to 1-ethyl-3-methylimidazolium bromide is 95:5.

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Abstract

The invention discloses a mixed solvent based on an ionic liquid and used for C5 separation. The mixed solvent contains a main solvent and the ionic liquid at a weight ratio of (79-99):(30-1), wherein the main solvent is one of acetonitrile, dimethyl formamide and N-methyl-pyrrolidone; and the ionic liquid is one of the following substances: an imidazole ionic liquid in which positive ions are imidazole positive ions and negative ions are fluorophosphate negative ions or halogen negative ions, a bi-phosphonium ionic liquid, an alkamine ionic liquid and a quaternary ammonium ionic liquid. By utilizing the mixed solvent disclosed by the invention to extract, rectify and separate C5 components, the relative volatility of the C5 components can be improved, the solvent ratio can be greatly reduced, the number of extracting and rectifying column plates can be reduced, the production cost can be lowered, and the material consumption and energy consumption can be saved.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a mixed solvent for C5 separation based on ionic liquid. Background technique [0002] C5 fraction is an important co-product of ethylene production plant, among which isoprene, cyclopentadiene and piperylene are all important raw materials of organic chemical industry and fine chemical industry. With the development of petrochemical industry, the separation and utilization of C5 fractions are of great significance to the rational use of resources and the improvement of the economics of ethylene plants. The components in the pyrolysis C5 fraction not only have similar boiling points, but also form two-component and three-component azeotropes with each other. It is difficult to obtain high-purity products by ordinary distillation. The separation process generally uses solvents to separate isoprene, piperylene and cyclopentadiene through extractive distillation. Commonly used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/08C07C11/18
CPCY02P20/54
Inventor 刘智信李东风程建民廖丽华李晓峰罗淑娟
Owner CHINA PETROLEUM & CHEM CORP
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