Novel method for separating mixture of ethylene glycol and 1, 2-butanediol by adopting azeotropic distillation and extraction coupling technologies

The technology of azeotropic distillation and azeotropic distillation column is applied in the field of separation of polyol mixed liquid, which can solve problems such as difficulty in separation, and achieve the effects of strong versatility, strong device operation stability and large processing capacity.

Inactive Publication Date: 2014-05-07
JILIN INST OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ethylene glycol and 1,2-butanediol have very close boiling points, so it is difficult to separate them by conventional methods

Method used

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  • Novel method for separating mixture of ethylene glycol and 1, 2-butanediol by adopting azeotropic distillation and extraction coupling technologies
  • Novel method for separating mixture of ethylene glycol and 1, 2-butanediol by adopting azeotropic distillation and extraction coupling technologies
  • Novel method for separating mixture of ethylene glycol and 1, 2-butanediol by adopting azeotropic distillation and extraction coupling technologies

Examples

Experimental program
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Effect test

example 1

[0012] Design, manufacture, install azeotropic rectification column and perform batch operation, the raw material is a mixture of ethylene glycol-1,2-butanediol-zeotropic agent (including ethylene glycol: 1,2-butanediol: azeotropic The boiling agent mass ratio is 2:1:7.46), the operating pressure is set to 80kpa, and the reflux ratio is 10. The temperature at the top of the tower is stable at about 170°C, and the temperature at the bottom of the tower changes from 180°C to 189°C. The azeotrope liquid of ethylene glycol and entrainer is obtained at the top of the tower, and the azeotrope content is 99.8%. The batch rectification operation has obtained a good separation effect, which proves that the experimental rectification tower can obtain azeotrope.

example 2

[0014] Adopt the equipment and operating conditions of the above example to carry out continuous rectification operation, and feed from the middle part of the rectification tower at normal temperature. The azeotrope can still be obtained at the top of the tower. After the stable production, adjust the reflux ratio, and continue to rectify under this condition to obtain high-concentration 1,2-butanediol in the bottom of the tower. After separation, the color of the product is qualified and the purity reaches over 98%.

example 3

[0016] Collect the azeotrope at the top of the above two examples, extract with extractant to form a heterogeneous solution, the upper layer is azeotrope, and the lower layer is a mixed solution of ethylene glycol and extractant; or use an extraction tower to separate to obtain a raffinate phase It is an entrainer, and finally the concentration of the entrainer is 99.24%, and the extraction phase is separated from the extractant by a rectifying tower. The extraction phase is a mixed solution of ethylene glycol and extractant. The extractant can be recycled after being separated by the extractant rectification tower. The obtained ethylene glycol crude product can be purified by the ethylene glycol rectification tower. Alcohol purity above 98%.

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Abstract

The invention provides a novel method for separating a mixture of ethylene glycol and 1, 2-butanediol by adopting azeotropic distillation and extraction coupling technologies. The method adopts continuous azeotropic distillation and extraction coupling separation technologies to separate an azeotropic mixture of ethylene glycol and 1, 2-butanediol; an entrainer and an extraction agent are selected through ASPEN modeling and simulation, and rectification and extraction conditions are determined preliminarily; a polyatomic alcohol mixed solution and the entrainer enter a rectification tower, and azeotropic liquid of ethylene glycol and the entrainer is obtained at the tower top, and 1,2-butanediol with high concentration is obtained at a tower kettle; the extraction agent is not dissolved into the entrainer but can be mutually dissolved with ethylene glycol; the extraction agent is added into the azeotropic liquid at the tower top for extraction, and the entrainer can be recovered; a mixture of ethylene glycol and the extraction agent is rectified under normal pressure or reduced pressure, so as to obtain the ethylene glycol product, and the extraction agent is recovered for cyclic utilization.

Description

technical field [0001] The invention relates to a method combining azeotropic distillation technology and extraction technology to separate ethylene glycol and 1,2-butanediol, which belongs to the separation engineering field of chemical engineering and is suitable for the separation of polyol mixed liquid . Background technique [0002] With the development of society, the resource crisis is becoming more and more serious, and the recycling of energy has become the focus of scientific research. There are many alcohols in the biological fermentation treatment liquid, and it is of great significance to separate them one by one and promote them to industrial production. Due to the rise in oil prices in recent years, a strategy of "substituting" oil for corn has been proposed. Using corn instead of petroleum as raw material to produce chemical alcohol has low cost and renewable resources are used to manufacture chemical products, so it is increasingly attracting the attention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/82C07C29/86
CPCC07C29/82C07C29/86C07C31/202C07C31/207
Inventor 戴传波潘高峰刘艳杰李强依春福齐文君
Owner JILIN INST OF CHEM TECH
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