Method for separating ethylene glycol and 1,2-butanediol

A separation method and 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 saving energy

Active Publication Date: 2015-09-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for separating ethylene glycol and 1,2-butanediol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] use figure 1 In the process shown, stream 1 is a mixture of ethylene glycol and 1,2-butanediol, and the composition in 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 terms of absolute pressure. , after distillation in the product tower, the tower still liquid 3 is ethylene glycol, after being refined through the ethylene glycol product refining tank R-101, the purity of the ethylene glycol product in terms of weight percentage reaches 99.91%, and in the logistics 2, it is in terms of 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, stream 2 enters from the 15th theoretical plate, the operating pressure is 10kPa in terms of absolute pressu...

Embodiment 2

[0043] use figure 1 In the process shown, stream 1 is a mixture of ethylene glycol and 1,2-butanediol, and the composition in 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 terms of absolute pressure, the temperature at the top of the tower is 139°C, the temperature at the bottom of the tower is 149.6°C, and the reflux ratio is 11.5 , after distillation in the product tower, the tower still liquid 3 is ethylene glycol, after being refined through the ethylene glycol product refining tank R-101, the purity of the ethylene glycol product in terms of weight percentage reaches 99.92%, and in the logistics 2, it is in terms of 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 3...

Embodiment 3

[0049] use figure 1 In the process shown, stream 1 is a mixture of ethylene glycol and 1,2-butanediol, and the composition in 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 terms of absolute pressure. , after distillation in the product tower, the tower still liquid 3 is ethylene glycol, after being refined through the ethylene glycol product refining tank R-101, the purity of the ethylene glycol product in weight percentage reaches 99.93%, and in the logistics 2 in weight percentage The compositions of ethylene glycol, 1,2-butanediol, and o-xylene are: 42.6%, 57.37%, and 0.03%, respectively.

[0051] T-102 is an azeotropic distillation tower with 45 theoretical plates. Stream 2 enters from the 28th theoretical plate. The operating pressure is 25kPa in absolute pressure. The ratio is 4.6, after azeotropic...

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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 invention relates to a method for separating 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 fiber, antifreeze, lubricant and other industries. There are a variety of process routes for the synthesis of ethylene glycol, and the current industrial route is mainly petroleum ethylene. With the increasing scarcity of petroleum resources, the development of the process route of producing ethylene glycol from coal-based syngas has been paid more and more attention. The quality of ethylene glycol products 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 reaction of dimethyl oxalate, when the hydrogenation catalyst contains acidic or basic groups, there are four main...

Claims

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Application Information

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