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Separation method of dimethyl carbonate and methanol

A technology of dimethyl carbonate and a separation method, which is applied in the field of separation of dimethyl carbonate and methanol, can solve problems such as high energy consumption and environmental pollution, and achieve the effects of low energy consumption, improved relative volatility and good separation effect

Pending Publication Date: 2018-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is the problem of high energy consumption and environmental pollution existing in the prior art; a new separation method of dimethyl carbonate and methanol is provided, which has the advantages of good separation effect, low energy consumption and green Advantages of environmental protection

Method used

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  • Separation method of dimethyl carbonate and methanol
  • Separation method of dimethyl carbonate and methanol
  • Separation method of dimethyl carbonate and methanol

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Experimental program
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Effect test

Embodiment 1

[0032] Such as image 3 The extractive distillation process shown. The extractive distillation column has 25 theoretical plates (the number of plates is counted from top to bottom), and the extractant ionic liquid 1-hexyl-3-methylimidazole hexafluorophosphate ([hmim][PF 6]) add from the 2nd tray, flow rate is 6.4kg / h, the mixture of raw material dimethyl carbonate and methyl alcohol adds from the 23rd tray, dimethyl carbonate content is 30wt%, methanol content is 70wt%, total The flow rate is 1kg / h, and the molar solvent ratio of the extractant to the raw material is 0.81 at this time. The extractive distillation tower is operated under normal pressure, the top of the tower is fully condensed, the reflux ratio is 1.5, the output of the tower top is 0.7kg / h, and 99.9wt% of methanol and 0.1wt% of dimethyl carbonate can be obtained. The temperature at the top of the extractive distillation tower is 40°C, and the temperature at the bottom of the tower is 99°C. The extractive di...

Embodiment 2

[0034] Such as image 3 The extractive distillation process shown. The extractive distillation column has 25 theoretical plates (the number of plates is counted from top to bottom), and the extractant ionic liquid 1-hexyl-3-methylimidazole hexafluorophosphate ([hmim][PF 6 ]) add from the 2nd tray, flow rate is 6.4kg / h, the mixture of raw material dimethyl carbonate and methyl alcohol adds from the 23rd tray, dimethyl carbonate content is 40wt%, methanol content is 60wt%, total The flow rate is 1kg / h, and the ratio of extractant to raw material molar solvent is 0.885. The extractive distillation tower is operated under normal pressure, the top of the tower is fully condensed, the reflux ratio is 1, the output of the tower top is 0.6kg / h, and 99.89wt% of methanol and 0.11wt% of dimethyl carbonate can be obtained. The temperature at the top of the extractive distillation tower is 40°C, and the temperature at the bottom of the tower is 96°C. The extractive distillation tower bo...

Embodiment 3

[0036] Such as image 3 The extractive distillation process shown. The extractive distillation column has 25 theoretical plates (the number of plates is counted from top to bottom), and the extractant ionic liquid 1-hexyl-3-methylimidazole hexafluorophosphate ([hmim][PF 6 ]) add from the 2nd tray, flow rate is 5.3kg / h, the mixture of raw material dimethyl carbonate and methyl alcohol adds from the 23rd tray, dimethyl carbonate content is 50wt%, methanol content is 50wt%, total The flow rate is 1kg / h, and the molar solvent ratio of the extractant to the raw material is 0.79. The extractive distillation tower is operated under normal pressure, the top of the tower is fully condensed, the reflux ratio is 1, the output of the tower top is 0.5kg / h, and 99.9wt% of methanol and 0.11wt% of dimethyl carbonate can be obtained. The temperature at the top of the extractive distillation tower is 40°C, and the temperature at the bottom of the tower is 87°C. The extractive distillation to...

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Abstract

The invention relates to a separation method of dimethyl carbonate and methanol and mainly solves problems of high energy consumption and environmental pollution in the prior art. The problem is better solved by means of the technical scheme as follows: the separation method of dimethyl carbonate and methanol adopts extractive distillation, and an ionic liquid with hexafluorophosphate as an anionis adopted as an extraction agent of the extractive distillation. The separation method can be applied to industrial production of separation of dimethyl carbonate and methanol.

Description

technical field [0001] The present invention relates to a kind of separation method of dimethyl carbonate and methanol, specifically, relate to a kind of extractive distillation separation method of dimethyl carbonate and methanol. Background technique [0002] Dimethyl carbonate (DMC) is an environmentally friendly chemical intermediate widely used in reactions such as methylation, carbonylation, carbonylmethylation and methoxylation, and is known as the "new cornerstone" of organic synthesis today . In industry, transesterification is usually used to produce dimethyl carbonate. During the production process, dimethyl carbonate and methanol form an azeotrope, which is difficult to separate by ordinary distillation methods. [0003] In recent years, technologies such as extractive distillation, pressurized distillation, azeotropic distillation and membrane separation have been used to produce high-purity dimethyl carbonate. Compared with the latter three processes, extract...

Claims

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Application Information

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IPC IPC(8): C07C68/08C07C69/96C07C29/84C07C31/04
CPCC07C29/84C07C68/08C07C69/96C07C31/04
Inventor 李骏杨为民何文军
Owner CHINA PETROLEUM & CHEM CORP
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