Continuous extractive distillation separation method of dimethyl carbonate-methanol azeotropic mixture

A technology of dimethyl carbonate and azeotropic mixture, which is applied in the field of continuous extraction, rectification and separation of dimethyl carbonate-methanol azeotropic mixture, can solve problems such as difficulty in obtaining high-purity dimethyl carbonate, and achieve environmental protection and good Economical and achieve the effect of recycling

Inactive Publication Date: 2013-06-19
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the main methods of synthesizing dimethyl carbonate are transesterification and methanol oxidative carbonylation. These two methods initially obtain a mixture of dimethyl carbonate and methanol (dimethyl carbonate mass fraction 30%), azeotropic The temperature is 64°C, so it is difficult to obtain high-purity dimethyl carbonate by conventional separation methods, and special separation techniques are required to achieve separation

Method used

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  • Continuous extractive distillation separation method of dimethyl carbonate-methanol azeotropic mixture
  • Continuous extractive distillation separation method of dimethyl carbonate-methanol azeotropic mixture

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Embodiment 1

[0021] by figure 2 In the process device shown, the extractive distillation tower has an inner diameter of 29mm, a stainless steel θ mesh ring of 3mm×3mm inside, a packing height of 1.5m, and the number of theoretical plates is about 30. The top of the tower is a condenser, and the tower kettle is equipped with an electric heating jacket. Heating, discharge at the top of the tower, and reflux at the top of the tower are adjusted with electromagnetic rods. The tower has 3 and 2 tower body sampling ports in the rectification section and the stripping section of the extractive distillation tower, respectively, so as to facilitate the detection of the mass fraction of the liquid phase composition.

[0022] Operate under normal temperature and pressure, separate the dimethyl carbonate-methanol azeotropic mixture, wherein the mass content of dimethyl carbonate is 70%, the solvent ethylene glycol is fed on the third board, and the raw materials are fed on the 20th board, The solven...

Embodiment 2

[0024] by figure 2 In the process device shown, the extractive distillation tower has an inner diameter of 29mm, a stainless steel θ mesh ring of 3mm×3mm inside, a packing height of 1.5m, and the number of theoretical plates is about 30. The top of the tower is a condenser, and the tower kettle is equipped with an electric heating jacket. Heating, discharge at the top of the tower, and reflux at the top of the tower are adjusted with electromagnetic rods. The tower has 3 and 2 tower body sampling ports in the rectification section and the stripping section of the extractive distillation tower, respectively, so as to facilitate the detection of the mass fraction of the liquid phase composition.

[0025] Operate under normal temperature and pressure, separate the dimethyl carbonate-methanol azeotropic mixture, wherein the mass content of dimethyl carbonate is 70%, the solvent ethylene glycol is fed on the third board, and the raw materials are fed on the 20th board, The solven...

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Abstract

The invention discloses a continuous extractive distillation separation method of a dimethyl carbonate-methanol azeotropic mixture, and relates to a continuous extractive distillation method. The technical process of the method is as follows: ethylene glycol is used as an extraction agent at normal pressure; the solvent ratio is 1-3; the separated dimethyl carbonate-methanol azeotropic mixture is fed from the middle part of a tower, the extraction agent is fed from the top of the tower, and the reflux ratio is 2; high-purity methanol is extracted from the tower top of an extractive distillation tower, and the dimethyl carbonate and the extraction agent are extracted from the tower bottom; the fraction at the tower bottom enters an extraction agent recovery tower, and the reflux ratio is 3; and dimethyl carbonate is extracted from the tower top, and the extraction agent extracted from the tower bottom can be recycled. The method disclosed by the invention adopts ethylene glycol as an extraction agent, and improves the separation effect of the dimethyl carbonate-methanol azeotropic mixture; and since ethylene glycol is a co-production product in synthesizing dimethyl carbonate by a transesterification method, the source is conveniently available, and the cost caused by introducing other substances is avoided.

Description

technical field [0001] The invention relates to a continuous extraction and rectification method, in particular to a continuous extraction and rectification separation method of dimethyl carbonate-methanol azeotropic mixture. Background technique [0002] Dimethyl carbonate is a basic organic chemical raw material, mainly used in the methylation, carbonylation and synthesis of pharmaceutical and chemical products. It was registered as a non-toxic substance in Europe in 1992 and is known as a green organic chemical for the 21st century. In addition, because dimethyl carbonate has excellent physical properties such as good compatibility, high octane number and dielectric constant, it is also widely used in fields such as solvents, gasoline additives, lithium-ion battery electrolytes, and can also be directly Synthetic products such as food additives, antioxidants, plant protection agents, advanced resins, fuels, pharmaceutical intermediates and surfactants. At present, the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C27/32C07C31/04C07C29/84C07C69/96C07C68/08
Inventor 张志刚李文秀吕明张弢
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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