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Separation method of ethylene glycol and 1,2-butanediol

A separation method, ethylene glycol technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problem of high energy consumption for separation, and achieve the effect of energy saving

Active Publication Date: 2017-04-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The technical problem to be solved by the present invention is that there is a problem of high energy consumption for separation in the prior art, and a new method for separating ethylene glycol and 1,2-butanediol is provided

Method used

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  • Separation method of ethylene glycol and 1,2-butanediol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] use figure 1 In the shown process, stream 1 is a mixed solution of ethylene glycol and 1,2-butanediol, and the composition by weight percentage is 0.4% of 1,2-butanediol and 99.6% of ethylene glycol.

[0038] T-101 is a product tower with 35 theoretical plates. Stream 1 enters from the 15th theoretical plate. The operating pressure is 10kPa in absolute pressure, the temperature at the top of the column is 134°C, the temperature in the tower is 157°C, and the reflux ratio is 12.6 , after the distillation of the product tower, the tower still liquid 3 is ethylene glycol, and after being purified by the ethylene glycol product refining tank R-101, the purity of the ethylene glycol product by weight percentage reaches 99.91%, and in the logistics 2, by weight percentage The compositions of ethylene glycol, 1,2-butanediol, and ethylbenzene are: 40.1%, 59.85%, and 0.05%, respectively.

[0039] T-102 is an azeotropic distillation column with 25 theoretical plates, and the str...

Embodiment 2

[0043] use figure 1 In the shown process, stream 1 is a mixed solution of ethylene glycol and 1,2-butanediol, and the composition by weight percentage is 1.5% of 1,2-butanediol and 98.5% of ethylene glycol.

[0044] T-101 is a product tower with 45 theoretical plates. Stream 1 enters from the 20th theoretical plate. The operating pressure is 15kPa in absolute pressure, the temperature at the top of the column is 139°C, the temperature in the tower is 149.6°C, and the reflux ratio is 11.5 , after the distillation of the product tower, the tower still liquid 3 is ethylene glycol, and after being purified by the ethylene glycol product refining tank R-101, the purity of the ethylene glycol product by weight percentage reaches 99.92%, and in the logistics 2, by weight percentage The compositions of ethylene glycol, 1,2-butanediol, and p-xylene are: 39.8%, 60.16%, and 0.04%, respectively.

[0045] T-102 is an azeotropic distillation column with 35 theoretical plates, and the strea...

Embodiment 3

[0049] use figure 1 In the shown process, stream 1 is a mixed solution of ethylene glycol and 1,2-butanediol, and the composition by weight percentage is 2.5% of 1,2-butanediol and 97.5% of ethylene glycol.

[0050] T-101 is a product tower with 55 theoretical plates. Stream 1 enters from the 30th theoretical plate. The operating pressure is 20kPa in absolute pressure, the temperature at the top of the column is 146°C, the temperature in the tower is 160.3°C, and the reflux ratio is 10.2 , after the distillation of the product tower, the tower still liquid 3 is ethylene glycol, and after being purified by the ethylene glycol product refining tank R-101, the purity of the ethylene glycol product by weight percentage reaches 99.93%, and in the logistics 2, by weight percentage The compositions of ethylene glycol, 1,2-butanediol, and o-xylene were 42.6%, 57.37%, and 0.03%, respectively.

[0051] T-102 is an azeotropic distillation column with 45 theoretical plates, and the strea...

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Abstract

The invention relates to a method for separating ethylene glycol and 1,2-butanediol, and is used for mainly solving the problem of high separation energy consumption in the prior art. The problem is better solved by adopting the technical scheme that the method includes the following steps: a) coarse ethylene glycol enters a product tower, an azeotrope of 1,2-butanediol and ethylene glycol is obtained at the tower top, and ethylene glycol is obtained at a tower kettle; b) the azeotrope of 1,2-butanediol and ethylene glycol enters an azeotropic rectification tower, an azeotropic agent is added from the tower top of the azeotropic rectification tower, an azeotrope of ethylene glycol and the azeotropic agent is obtained at the tower top, and the 1,2-butanediol product is obtained in the tower kettle; c) the azeotrope of ethylene glycol and the azeotropic agent is condensed, then enters a phase splitter, and is divided into an upper-layer material flow rich in the azeotropic agent and a lower-layer material flow rich in ethylene glycol; the upper-layer material flow returns to the tower top of the azeotropic rectification tower; and d) the lower-layer material flow enters an azeotropic agent recovery tower, a tower top material flow is circulated to the azeotropic rectification tower, and a tower kettle material flow is circulated to a product tower. The method can be used in industrial production of separation of ethylene glycol and 1,2-butanediol.

Description

technical field [0001] The present invention relates to a separation method of ethylene glycol and 1,2-butanediol. Background technique [0002] As an important organic chemical raw material, ethylene glycol (EG) is widely used in the production of polyester fibers, antifreeze, lubricants and other industries. There are various process routes for synthesizing ethylene glycol, and the current industry is mainly petroleum ethylene route. With the increasing scarcity of petroleum resources, more and more attention has been paid to the development of coal-based synthesis gas to ethylene glycol process. The quality of the ethylene glycol product needs to be separated in the subsequent purification process, especially the boiling point of 1,2-butanediol is similar to that of ethylene glycol, so the separation is difficult. [0003] In the hydrogenation of dimethyl oxalate, when the hydrogenation catalyst contains acidic or basic groups, the main reactions that may occur in the h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/80
Inventor 杨卫胜胡松卢和泮
Owner CHINA PETROLEUM & CHEM CORP