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Method for separating cyclohexane and tert-butyl alcohol through liquid-liquid extraction-flash evaporation

A technology of cyclohexane and tert-butanol, applied in chemical instruments and methods, purification/separation of hydrocarbons, separation/purification of hydroxyl compounds, etc., can solve the problems of low removal rate, waste of resources, high energy consumption, and achieve investment The effect of less equipment, less loss and high purity

Pending Publication Date: 2021-01-15
洪泽县恒泰科工贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Existing technologies for processing and separating cyclohexane have problems such as resource waste, high energy consumption, and low removal rate

Method used

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  • Method for separating cyclohexane and tert-butyl alcohol through liquid-liquid extraction-flash evaporation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The feed flow rate is 1000kg / h, the feed contains 66.74% cyclohexane and 33.26% (mass fraction) of tert-butanol, the number of theoretical plates of the liquid-liquid extraction tower (LET) is 5, and the mixture of cyclohexane and tert-butanol It enters from the bottom of the liquid-liquid extraction tower (LET), and the extractant enters from the top of the liquid-liquid extraction tower (LET). The extractant is 1-n-butyl-3-methylimidazolium trifluoromethanesulfonate ionic liquid, and the flow rate The temperature of the liquid-liquid extraction tower (LET) is 28°C. The operating pressure of the flash tank (F1) is 0.01 bar, the purity of cyclohexane after separation is 99.96%, and the yield of tert-butanol is 99.2%.

Embodiment 2

[0034] The feed flow rate is 1000kg / h, the feed contains 66.74% cyclohexane and 33.26% (mass fraction) of tert-butanol, the theoretical plate number of the liquid-liquid extraction tower (LET) is 10, and the mixture of cyclohexane and tert-butanol It enters from the bottom of the liquid-liquid extraction tower (LET), and the extractant enters from the top of the liquid-liquid extraction tower (LET). The extractant is 1-n-butyl-3-methylimidazolium trifluoromethanesulfonate ionic liquid, and the flow rate The temperature of the liquid-liquid extraction tower (LET) is 29°C. The operating pressure of the flash tank (F1) is 0.015 bar, the purity of phenol after separation is 99.97%, and the yield of tert-butanol is 99.2%.

Embodiment 3

[0036] The feed flow rate is 1000kg / h, the feed contains 66.74% cyclohexane and 33.26% (mass fraction) of tert-butanol, the number of theoretical plates of the liquid-liquid extraction tower (LET) is 15, and the mixture of cyclohexane and tert-butanol It enters from the bottom of the liquid-liquid extraction tower (LET), and the extractant enters from the top of the liquid-liquid extraction tower (LET). The extractant is 1-n-butyl-3-methylimidazolium trifluoromethanesulfonate ionic liquid, and the flow rate The temperature of the liquid-liquid extraction tower (LET) is 30.5°C. The operating pressure of the flash tank (F1) is 0.02 bar, the purity of phenol after separation is 99.97%, and the yield of tert-butanol is 99.4%.

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Abstract

The invention relates to a method for separating cyclohexane and tert-butyl alcohol through liquid-liquid extraction flash evaporation and a device suitable for the method. According to the method, imidazole ionic liquid is used as an extraction agent, cyclohexane and tert-butyl alcohol firstly enter a liquid-liquid extraction tower to be extracted and separated, high-purity cyclohexane is obtained at the top of the liquid-liquid extraction tower, materials at the bottom of the liquid-liquid extraction tower enter a flash tank to be separated, and high-recovery-rate tert-butyl alcohol is obtained at the top of the flash tank. High-purity ionic liquid is extracted from the bottom of the flash tank for recycling. The method has the advantages of low energy consumption, simple process, high purity of cyclohexane after separation and the like, the adopted extracting agent imidazole ionic liquid is hardly volatilized, the loss of the extracting agent is reduced, and the method is easy to recover, good in chemical thermal stability, green and pollution-free.

Description

technical field [0001] The invention belongs to the field of chemical separation and purification, and in particular relates to a liquid-liquid extraction-flashing method for separating a mixture of cyclohexane and tert-butanol, furthermore, it relates to an extraction tower using an imidazole ionic liquid as an extraction agent. Then adopt the flash tank liquid-liquid extraction-flash separation method of cyclohexane and tert-butanol. Background technique [0002] Cyclohexane is used as a solvent for rubber, paints and varnishes, as a thinner for adhesives and as an oil extractant. Tert-butanol is a widely used organic solvent. It is commonly used as a gasoline additive, as a solvent for organic reaction processes, and as a coating. Separation of tert-butanol and water during the co-oxidation of propylene / isobutane is a relatively difficult matter. For the tert-butanol dehydration system, cyclohexane is usually selected as the entrainer. Thus, during the separation, a m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C29/76C07C29/86C07C13/18C07C31/12
CPCC07C7/005C07C29/76C07C29/86C07C2601/14C07C13/18C07C31/12
Inventor 朱兆友徐颖刘兴振朱峰
Owner 洪泽县恒泰科工贸有限公司
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