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Novel method for separating ethylene glycol and 1,2-pentanediol

A technology of ethylene glycol and pentanediol, applied in the field of separation engineering, can solve problems such as difficult separation, and achieve the effects of strong practicability and strong device operation stability.

Inactive Publication Date: 2015-02-25
JILIN INST OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ethylene glycol and 1,2-pentanediol have very close boiling points, so it is difficult to separate them by ordinary methods

Method used

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  • Novel method for separating ethylene glycol and 1,2-pentanediol
  • Novel method for separating ethylene glycol and 1,2-pentanediol

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0012] The azeotropic rectification column is adopted and operated intermittently, and the raw material is a mixture of ethylene glycol-1,2-pentanediol-zeotrope (which contains ethylene glycol: 1,2-pentanediol: entrainer mass ratio 2:1:2), the operating pressure is set to 40kpa, and the reflux ratio is 15. The temperature at the top of the tower is stable at about 145°C, and the temperature at the bottom of the tower changes from 160°C to 169°C. The azeotropic liquid of ethylene glycol and entrainer is obtained at the top of the tower, and the azeotrope content reaches 99.9% by adjusting the reflux ratio. The azeotropic distillation operation has obtained a very good separation effect, which proves that this method can obtain azeotropes with a rectification column.

example 2

[0014] Adopt the equipment and operating conditions of the above example to carry out continuous rectification operation, and feed from the middle and bottom of the rectification tower at normal temperature. The azeotrope can still be obtained at the top of the tower. After the stable production, the qualified 1,2-pentanediol product can be obtained in the bottom of the tower by adjusting the reflux ratio and continuing the rectification, with a purity of more than 98%.

example 3

[0016] The top azeotropes of the above two examples were collected, extracted with an extractant, and filtered. The filtrate was a mixed solution of ethylene glycol and the extractant, and the filter cake was an azeotrope. After drying, the purity of the entrainer finally obtained is 99.5%. The mixed solution of ethylene glycol and extractant is separated by a common rectification tower to obtain qualified ethylene glycol products with a purity of over 98%, and the obtained extractant can be recycled.

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Abstract

The invention discloses a novel method for separating ethylene glycol and 1,2-pentanediol. The separation process mainly comprises the unit operation steps of azeotropic distillation, extraction, filtration, rectification and the like. According to the method, a proper entrainer is selected, and the rectification operation condition is preliminarily determined; a mixture of ethylene glycol and 1,2-pentanediol is fed into a rectification tower together with the entrainer, an azeotrope liquid of ethylene glycol and the entrainer is obtained on the top of the tower, and a qualified 1,2-pentanediol product is obtained at the bottom of the tower; an extracting agent is insoluble in the entrainer, but is soluble with ethylene glycol, the extracting agent is added into the azeotrope liquid and cooling and filtering are carried out, so that the azeotrope liquid can be separated, the filter cake is the entrainer and can be recycled, and the filtrate is a mixture of ethylene glycol and the extracting agent; the qualified ethylene glycol product can be prepared from the filtrate by normal-pressure or reduced-pressure rectification, and the extracting agent can be reclaimed and recycled.

Description

technical field [0001] The invention relates to a new method for separating ethylene glycol and 1,2-pentanediol. The method is applicable to the separation of polyalcohol mixtures containing ethylene glycol and 1,2-pentanediol, and belongs to the field of separation engineering in chemical engineering. Background technique [0002] With the development of the global economy, the demand for oil is increasing day by day, while oil resources are decreasing day by day, and the contradiction between oil supply and demand is becoming increasingly serious. Utilizing renewable biomass resources, developing biomass chemical industry, replacing petrochemical products, and obtaining energy, resources and materials from biomass are the focus of global research. The use of corn instead of petroleum resources to produce phytochemical alcohols and chemical materials has become the focus of scientific research. With the gradual reduction of global oil resources and the rising internationa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/76C07C29/82C07C31/20
CPCC07C29/82C07C29/76C07C29/80C07C29/86C07C31/202C07C31/20
Inventor 戴传波代小民文卫东潘高峰刘艳杰李瑞端王犇张爽计海峰
Owner JILIN INST OF CHEM TECH
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