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Extractive distillation separation method of dimethyl carbonate and methanol

A technology of dimethyl carbonate, extraction and rectification, applied in the purification/separation of carbonate/haloformate, chemical instruments and methods, preparation of organic compounds, etc., can solve problems such as high energy consumption and environmental pollution , achieve low energy consumption, increase relative volatility, and good separation effect

Active Publication Date: 2021-11-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Extractive distillation separation method of dimethyl carbonate and methanol
  • Extractive distillation separation method of dimethyl carbonate and methanol
  • Extractive distillation separation method of dimethyl carbonate and methanol

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Experimental program
Comparison scheme
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Embodiment 1

[0032] Such as image 3 The extractive distillation process shown. The extractive distillation column has 25 theoretical trays (the number of trays is counted from top to bottom), and the extractant ionic liquid 1-hexyl-3-methylimidazole bistrifluoromethanesulfonimide salt ([hmim][NTf 2]) add from the 2nd tray, flow rate is 11kg / 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 flow is 1kg / h, and the ratio of extractant to raw material molar solvent is 0.87. 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 0.7kg / h, and 99.85wt% of methanol and 0.15wt% 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 distillation tower...

Embodiment 2

[0034] Such as image 3 The extractive distillation process shown. The extractive distillation column has 25 theoretical trays (the number of trays is counted from top to bottom), and the extractant ionic liquid 1-hexyl-3-methylimidazole bistrifluoromethanesulfonimide salt ([hmim][NTf 2 ]) add from the 2nd tray, flow rate is 10kg / 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 flow It is 1kg / h, and the ratio of extractant to raw material molar solvent is 0.857. 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 99.9wt% 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 96°C. The extractive distillation to...

Embodiment 3

[0036] Such as image 3 The extractive distillation process shown. The extractive distillation column has 25 theoretical trays (the number of trays is counted from top to bottom), and the extractant ionic liquid 1-hexyl-3-methylimidazole bistrifluoromethanesulfonimide salt ([hmim][NTf 2 ]) add from the 2nd tray, flow rate is 8kg / 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 flow is 1kg / h, and the ratio of extractant to raw material molar solvent is 0.75. 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 99.93wt% of methanol and 0.07wt% 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 89°C. The extractive distillation tower...

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Abstract

The invention relates to a method for extracting, rectifying and separating dimethyl carbonate and methanol, which mainly solves the problems of high energy consumption and environmental pollution in the prior art. The present invention solves this problem better by adopting the extraction and rectification separation method of dimethyl carbonate and methanol, and the extraction and rectification adopts the technical scheme that the anion is a bistrifluoromethanesulfonylimide ionic liquid as the extraction agent. Technical problem, it can be used in the industrial production of separating dimethyl carbonate and methanol.

Description

technical field [0001] The invention relates to a method for extracting, rectifying and separating 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, extractive distillation has the advantages of low energy consumption, simple process and wide selection of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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