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Method for separating cyclopentane and 2,2-dimethylbutane

A technology of dimethyl butane and cyclopentane, which is applied in the field of separating cyclopentane and 2,2-dimethyl butane, can solve the problem of unqualified water-soluble acid and alkali, solvent ratio and reflux ratio of cyclopentane products small problems, to achieve the effects of high solubility and selectivity, reduced energy consumption and material consumption, and broad application prospects

Active Publication Date: 2020-08-21
SHANDONG JINGBO PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Wu Lehuan's doctoral thesis "Research on Separation Technology of Cyclopentane / Neohexane Mixture" of University of Petroleum introduced the separation research using DMF+ionic liquid as extraction agent; compared DMF+ionic liquid with pure DMF as extraction agent and mixed solvent through aspenplus simulation The solvent ratio and reflux ratio are both smaller, but it does not solve the problem that when the actual material contains water, DMF is hydrolyzed to produce dimethylamine, resulting in the unqualified problem of cyclopentane product water-soluble acid-base

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The composition of the mixed material is 95.73wt% of cyclopentane and 4.27wt% of 2,2-dimethylbutane; the composite solvent is NMP and CHPMIM.BF4 with a mass ratio of 8:1.

[0048] The mixed material is fed in the middle of the extractive distillation tower, and the composite solvent is fed in the upper part of the extractive distillation tower for extractive distillation, wherein, the feed mass ratio of the composite solvent and the mixed feed is 4:1, and the feed of the composite solvent The temperature is 50°C, the pressure at the top of the extractive distillation tower is controlled to be 35kPa, the temperature at the top of the tower is 63±1°C, the reflux ratio is 50, and the temperature at the bottom of the tower is 91°C; the purity obtained at the top of the extractive distillation tower is more than 90wt%. 2,2-dimethylbutane, and the rich solvent containing cyclopentane is obtained at the bottom of the extraction and rectification tower; the rich solvent containi...

Embodiment 2

[0050] The composition of the mixed material is 74.16wt% cyclopentane and 25.84wt% 2,2-dimethylbutane; the composite solvent is NMP and CHPMIM.BF4 with a mass ratio of 10:1.

[0051] The mixed material is fed in the middle of the extractive distillation tower, and the composite solvent is fed in the upper part of the extractive distillation tower for extractive distillation, wherein the feed mass ratio of the composite solvent and the mixed feed is 8:1, and the feed of the composite solvent The temperature is 60°C, the pressure at the top of the extractive distillation tower is controlled at 55kPa, the temperature at the top of the tower is 63±1°C, the reflux ratio is 30, and the temperature at the bottom of the tower is 100.5°C; the purity obtained at the top of the extractive distillation tower is more than 90wt%. 2,2-dimethylbutane, and the rich solvent containing cyclopentane is obtained at the bottom of the extraction and rectification tower; the rich solvent containing cy...

Embodiment 3

[0053] The composition of the mixed material is 88.73wt% of cyclopentane and 11.27wt% of 2,2-dimethylbutane; the composite solvent is NMP and CHPMIM.BF4 with a mass ratio of 12:1.

[0054] The mixed material is fed in the middle of the extractive distillation tower, and the composite solvent is fed in the upper part of the extractive distillation tower for extractive distillation, wherein, the feed mass ratio of the composite solvent and the mixed feed is 7:1, and the feed of the composite solvent The temperature is 60°C, the pressure at the top of the extractive distillation tower is 50kPa, the temperature at the top of the tower is 63±1°C, the reflux ratio is 45, and the temperature at the bottom of the tower is 98°C; the purity obtained at the top of the extractive distillation tower is more than 90wt%. 2,2-dimethylbutane, and the rich solvent containing cyclopentane is obtained at the bottom of the extraction and rectification tower; the rich solvent containing cyclopentane...

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PUM

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Abstract

The invention provides a method for separating cyclopentane and 2,2-dimethylbutane. The method comprises the following steps: a) contacting a mixed material with a composite solvent for extractive distillation to respectively obtain a cyclopentane-containing rich solvent and 2,2-dimethylbutane, wherein the mixed material comprises cyclopentane and 2,2-dimethylbutane, and the composite solvent comprises N-methylpyrrolidone and ionic liquid; and b) resolving the cyclopentane-containing rich solvent obtained in the step a) to respectively obtain a cyclopentane product and the composite solvent. Compared with the prior art, the method provided by the invention has the advantages that the cyclopentane and the 2,2-dimethylbutane are efficiently separated by adopting the composite solvent with aspecific composition, so the cyclopentane product with the purity of more than or equal to 99.5 wt% is obtained; the method has the advantages of simple process, high extractant stability, high dissolvability and selectivity to cyclopentane, no decomposition of an extractant during desorption, no generation of impurities, and high purity of the obtained cyclopentane product.

Description

technical field [0001] The invention relates to the technical field of organic chemical industry, more specifically, relates to a method for separating cyclopentane and 2,2-dimethylbutane. Background technique [0002] Cyclopentane is not only an environmentally friendly refrigerant, but also an excellent polyurethane foaming agent. Cyclopentane is widely found in C5 resources such as oilfield condensate oil, top oil of reforming unit, cracking raffinate, etc. At present, cyclopentane is mainly obtained by simple separation after hydrogenation of olefins with five-membered rings in cracking C5 However, the light hydrocarbon resources containing cyclopentane are sold as solvent oil and are not fully utilized. Since the boiling point difference between cyclopentane and 2,2-dimethylbutane is only 0.4°C, and cyclopentane and 2,2-dimethylbutane are azeotropic (Solvent Azeotropic Handbook (Second Edition), 2 , the azeotropic composition of 2-dimethylbutane is 82.3%, and the azeo...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C7/08C07C7/10C07C13/10C07C9/16
CPCC07C7/005C07C7/08C07C7/10C07C2601/08C07C13/10C07C9/16Y02P20/54
Inventor 雷雳光史会兵王耀伟栾波
Owner SHANDONG JINGBO PETROCHEM