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Device and method for separating n-butanol from n-butyl ether by using extraction and distillation process

A technology of n-butanol and n-butyl ether, applied in chemical instruments and methods, separation/purification of ether, purification/separation of oxygenated compounds, etc., can solve problems such as separation, achieve simple and controllable process, no waste discharge, The effect of low process energy consumption

Pending Publication Date: 2019-03-08
BAILONG CHEM SHIJIAZHUANG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, butanol and butyl ether can form ternary azeotropes with water, which cannot be separated by general distillation methods.

Method used

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  • Device and method for separating n-butanol from n-butyl ether by using extraction and distillation process

Examples

Experimental program
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Effect test

specific Embodiment 1

[0034] A method utilizing extraction and rectification process to separate n-butanol and n-butyl ether, the steps are as follows:

[0035]The raw material comes from the DBP process, characterized by 93% butyl ether and 7% butanol. Operation, reflux ratio 1, extractant recovery tower, normal pressure operation, reflux ratio 0.26. The temperature at the top of the butyl ether recovery tower is 142.1°C, the temperature at the bottom of the butyl ether recovery tower is 197.6°C, the temperature at the top of the extraction agent recovery tower is 117.5°C, and the temperature at the bottom of the extraction agent recovery tower is 178.2°C. The equipment runs continuously for 12 hours, the purity of the butyl ether product is 98.6%, and the purity of the butanol product is 99.7%.wt.

specific Embodiment 2

[0036] A method utilizing extraction and rectification process to separate n-butanol and n-butyl ether, the steps are as follows:

[0037] The overall process is the same as in Example 1, but the difference is that the raw material comes from the DBP process, characterized by 93% butyl ether and 7% butanol. The extraction tower is operated at normal temperature and pressure, and the extraction agent and raw material feed The quantities are 1000kg / h and 500kg / h respectively; the butyl ether recovery tower operates under normal pressure with a reflux ratio of 2, and the extractant recovery tower operates under normal pressure with a reflux ratio of 0.3. The temperature at the top of the butyl ether recovery tower is 142.3°C, the temperature at the bottom of the butyl ether recovery tower is 198.4°C, the temperature at the top of the extraction agent recovery tower is 117.4°C, and the temperature at the bottom of the extraction agent recovery tower is 179.9°C. The equipment runs ...

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Abstract

The invention relates to a device and a method for separating n-butanol from n-butyl ether by using an extraction and distillation process. The device comprises an extraction column, a butyl ether recovering tower, an extractant regeneration tower, a butyl ether recovering tower overhead condenser, a butyl ether recovering tower bottom reboiler, an extractant regeneration tower overhead condenser,and an extractant regeneration tower bottom reboiler. The method is characterized in that an extractant and butanol and butyl ether feed solutions are subjected to continuous counter-current extraction in the extraction column; an extraction column overhead liquid phase enters the butyl ether recovering tower; the separated qualified butyl ether product is extracted from the tower top, and towerbottom regeneration extractant refluxes to enter the extraction column; an extraction column bottom liquid phase enters an extractant recovering tower; a separated qualified butanol product is extracted from the tower top; a tower bottom regeneration extractant refluxes to enter the extraction column, so that recycling of the extractant is realized. According to the method disclosed by the invention, the problem that the butanol is difficult to be separated from the butyl ether in an existing DBP production technology is solved. The technology disclosed by the invention has the advantages of simplicity, controllability, low energy consumption and no waste discharge.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a device and a method for separating n-butanol and n-butyl ether by using extraction and rectification techniques. Background technique [0002] The production of plasticizer dibutyl phthalate (DBP) is synthesized by esterification reaction of phthalic anhydride and butanol under the catalysis of concentrated sulfuric acid. Because this reaction is a reversible reaction, the method of excess butanol is usually used in production. Therefore, the by-product butyl ether is continuously accumulated in the circulating alcohol, and when it reaches a certain concentration, it will affect the speed of the esterification reaction and the quality of the DBP product. Because butyl ether is an important factor affecting the quality of DBP products, and it can be steamed out together with alcohol and water at the temperature of esterification reaction, and is refluxed i...

Claims

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Application Information

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IPC IPC(8): C07C27/26C07C27/28C07C27/34C07C41/34C07C41/38C07C41/42C07C43/04C07C29/76C07C29/80C07C29/86C07C31/12
CPCC07C29/76C07C29/80C07C29/86C07C41/34C07C41/38C07C41/42C07C43/04C07C31/12
Inventor 吕国民李凭力赵雅静闫雪刚李英栋崔富华马英姿常贺英刘诗尧
Owner BAILONG CHEM SHIJIAZHUANG
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