Method and device for separating acetic acid sec-butyl ester and sec-butyl alcohol

A technology for sec-butyl acetate and sec-butanol, which is applied in the field of separation of sec-butyl acetate and sec-butanol, can solve the problems of low separation purity and difficult separation of sec-butyl acetate and sec-butanol, and achieve good separation effect, Easy operation, simple process effect

Inactive Publication Date: 2015-12-02
HUNAN ZHONGCHUANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the problem that sec-butyl acetate and sec-butanol are difficult to separate and the separation purity is low in the existing separation technology, and a method and device for efficiently separating sec-butyl acetate and sec-butanol are provided. The purity of sec-butyl acetate is above 99%, and the purity of separated sec-butanol reaches 99.99%, meeting the needs of downstream methyl ethyl ketone units

Method used

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  • Method and device for separating acetic acid sec-butyl ester and sec-butyl alcohol

Examples

Experimental program
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Embodiment 1

[0034] The mixed material containing sec-butyl acetate and sec-butanol is preheated and sent to the extractive distillation tower 4 at a speed of 10t / h, wherein the mixed material comes from the tower after the catalytic rectification reaction of sec-butyl acetate and methanol Kettle mixture, the content of sec-butyl acetate is 50%, the content of sec-butanol is 50%, the temperature of the mixture material is 140°C, and the extractant 1,3-propanediol is fed in at a speed of 40t / h (solvent ratio is 4) Extractive distillation tower 4, the top temperature of the extractive distillation tower is 125°C, the top pressure is normal pressure, and the reflux ratio is 2:1. After separation by extraction and rectification, sec-butyl acetate is steamed from the top of the tower and condensed Extract at a speed of 5t / h afterward to obtain sec-butyl acetate 9, and the mixture (rich solvent) of sec-butanol and extractant is sent into the solvent concentration tower 13 after taking out from th...

Embodiment 2

[0037] The mixed material containing sec-butyl acetate and sec-butanol is preheated and sent to the extractive distillation column 4 at a speed of 10t / h, wherein the mixed material comes from the tower after the catalytic rectification reaction of sec-butyl acetate and ethanol Still mixture, the content of sec-butyl acetate is 10%, the content of sec-butanol is 90%, the temperature of the mixture material is 120 ℃, and the extraction agent ethylene glycol is sent into the extractant with a speed of 200t / h (solvent ratio is 20). Distillation tower 4, the tower top temperature of extractive rectification tower is 107 ℃, and tower top pressure is normal pressure, and reflux ratio is 0.5:1, after extraction and rectification separation, sec-butyl acetate steams out from tower top and after condensing The speed extraction of 1t / h obtains sec-butyl acetate 9, and the mixture (rich solvent) of sec-butanol and extractant is sent into solvent concentration tower 13 after taking out from...

Embodiment 3

[0040] The mixed material containing sec-butyl acetate and sec-butanol is preheated and sent to the extractive distillation tower 4 at a speed of 10t / h, wherein the mixed material comes from the tower after the catalytic rectification reaction of sec-butyl acetate and methanol Kettle mixture, the content of sec-butyl acetate is 20%, the content of sec-butanol is 80%, the temperature of the mixture material is 110°C, and the extractant 1,2-propanediol is fed in at a speed of 100t / h (solvent ratio is 10) Extractive distillation tower 4, the top temperature of the extractive distillation tower is 110°C, the top pressure is normal pressure, and the reflux ratio is 0.8:1. After separation by extraction and rectification, sec-butyl acetate is steamed from the top of the tower and condensed Extract at a speed of 2t / h to obtain sec-butyl acetate 9 afterward, and the mixture (rich solvent) of sec-butanol and extractant is sent into solvent concentration tower 13 after taking out from th...

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Abstract

The invention provides a method and device for separating acetic acid sec-butyl ester and sec-butyl alcohol. The method comprises the steps that 1, a mixture of the acetic acid sec-butyl ester and the sec-butyl alcohol is put into an extraction rectifying tower, an extraction agent is added, after extraction rectifying separation is performed, the acetic acid sec-butyl ester is steamed out from the tower top and condensed, then part of the acetic acid sec-butyl ester is used for reflux, part of the acetic acid sec-butyl ester is extracted to obtain the acetic acid sec-butyl ester, and a mixture of the sec-butyl alcohol and the extraction agent falls into the tower bottom; 2, the mixture of the sec-butyl alcohol and the extraction agent is extracted out from the tower bottom and then put into a solvent concentration tower, the sec-butyl alcohol is steamed out from the tower top and then condensed, then part of the sec-butyl ester is put into the solvent concentration tower for reflux, part of the sec-butyl ester is extracted to obtain the sec-butyl ester, and the extraction agent falls into the tower bottom; 3, the extraction agent is extracted out from the tower bottom and then returns to the extraction rectifying tower for cyclic utilization. According to the method, the problem that in the prior art, the acetic acid sec-butyl ester and the sec-butyl alcohol are difficult to separate is solved, the purity of the separated acetic acid sec-butyl ester is above 99 percent, and the purity of the separated sec-butyl ester is above 99.9 percent; meanwhile, the energy consumption of the separation process is low, the procedures are simple, and operation is easy.

Description

technical field [0001] The invention relates to a method and device for separating sec-butyl acetate and sec-butanol, in particular to a method for separating sec-butyl acetate and sec-butanol from a mixture of sec-butyl acetate and sec-butanol by means of extractive distillation and devices. Background technique [0002] Secondary butanol (SBA), also known as second butanol, methyl ethyl carbinol, other butanol, 2-butanol, is a colorless, transparent, flammable liquid with a wine-like smell. SBA is used as a solvent in industry, co-solvent with methanol, can be used as a component to increase the octane number of gasoline, and can also be used to produce plasticizers, mineral dressing agents, herbicides, sec-butyl esters, etc., but the most important application is The production of methyl ethyl ketone accounts for about 90% of the total consumption. At present, the relatively mature methods in the industry include the indirect hydration method of n-butene and the direct ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/14C07C67/54C07C31/12C07C29/84
CPCC07C67/54C07C29/84C07C69/14C07C31/12
Inventor 黄能武申文义刘郁东张小明
Owner HUNAN ZHONGCHUANG CHEM
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