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
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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 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

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0031] [Example 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), the extractant ionic liquid 1-hexyl-3-methylimidazole hexafluorophosphate ([hmim][PF 6 ]) Add from the second tray, the flow rate is 6.4kg / h, the mixture of raw material dimethyl carbonate and methanol is added from the 23rd tray, the dimethyl carbonate content is 30wt%, the methanol content is 70wt%, the total The flow rate is 1kg / h, and the molar solvent ratio of extractant to raw material is 0.81. The extractive distillation tower is operated under normal pressure, the top of the tower is fully condensed, the reflux ratio is 1.5, and the output at the top of the tower is 0.7kg / h, and 99.9% by weight of methanol and 0.1% by weight 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...

Example Embodiment

[0033] [Example 2]

[0034] Such as image 3 The extractive distillation process shown. The extractive distillation tower has 25 theoretical plates (the number of plates is counted from top to bottom), the extractant ionic liquid 1-hexyl-3-methylimidazole hexafluorophosphate ([hmim][PF 6 ]) Add from the second tray, the flow rate is 6.4kg / h, the mixture of raw material dimethyl carbonate and methanol is added from the 23rd tray, the dimethyl carbonate content is 40wt%, the methanol content is 60wt%, the total The flow rate is 1kg / h, and the molar solvent ratio of extractant to raw material 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, and the output at the top of the tower 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...

Example Embodiment

[0035] [Example 3]

[0036] Such as image 3 The extractive distillation process shown. The extractive distillation tower has 25 theoretical plates (the number of plates is counted from top to bottom), the extractant ionic liquid 1-hexyl-3-methylimidazole hexafluorophosphate ([hmim][PF 6 ]) Add from the second tray, the flow rate is 5.3kg / h, the mixture of raw material dimethyl carbonate and methanol is added from the 23rd tray, the dimethyl carbonate content is 50wt%, the methanol content is 50wt%, the total The flow rate is 1kg / h, and the molar solvent ratio of extractant to 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, and the output at the top of the tower 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...

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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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