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Process for the continuous separation of mixtures of dimethyl carbonate and methanol

A dimethyl carbonate and separation method technology, applied in the field of continuous extraction, rectification and separation of dimethyl carbonate and methanol, can solve the problem that the extractant cannot be operated continuously, achieve good separation effect, good thermal stability, and mutual solubility Good results

Active Publication Date: 2021-08-03
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
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Problems solved by technology

[0006] In order to solve the problem that the ionic liquid existing in the azeotrope separation of dimethyl carbonate and methanol cannot operate continuously as an extractant, the present invention provides a continuous extraction and rectification separation method, which has good separation effect, simple process, and continuous equipment The advantages of stable operation

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  • Process for the continuous separation of mixtures of dimethyl carbonate and methanol
  • Process for the continuous separation of mixtures of dimethyl carbonate and methanol

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Experimental program
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Effect test

Embodiment 1

[0025] Such as figure 2 The extractive distillation process shown. The extractive distillation column has 33 theoretical plates (the number of plates is counted from top to bottom), and the mixed extractant contains 30wt% polyethylene glycol dimethyl ether (average relative molecular mass is 250) and 70wt% 1-hexyl-3 -Methylimidazolium hexafluorophosphate ([hmim][PF 6 ]) add from the 3rd tray, total flow is 5kg / h, the mixture of raw material dimethyl carbonate and methyl alcohol adds from the 29th tray, dimethyl carbonate content is 30wt%, methanol content is 70wt%, total The flow rate is 1kg / h, and the mass ratio of extractant to raw material is 5 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 at the top of the tower is 0.7kg / h, 99.6wt% of methanol can be obtained, and the temperature of the top of the extractive distillation tower is 64°C. The temperature of th...

Embodiment 2

[0027] Such as figure 2 The extractive distillation process shown. The extractive distillation column has 33 theoretical plates (the number of plates is counted from top to bottom), and the mixed extractant contains 30wt% polyethylene glycol dimethyl ether (average relative molecular mass is 250) and 70wt% 1-hexyl-3 -Methylimidazolium hexafluorophosphate ([hmim][PF 6 ]) add from the 3rd tray, total flow is 7kg / h, the mixture of raw material dimethyl carbonate and methyl alcohol adds from the 29th tray, dimethyl carbonate content is 30wt%, methanol content is 70wt%, total The flow rate is 1kg / h, and the mass ratio of extractant to raw material is 7 at this time. The extractive distillation tower operates under normal pressure, the top of the tower is fully condensed, the reflux ratio is 1.4, the output at the top of the tower is 0.7kg / h, 99.79wt% of methanol can be obtained, and the temperature of the top of the extractive distillation tower is 64°C. The temperature of the ...

Embodiment 3

[0029] Such as figure 2 The extractive distillation process shown. The extractive distillation column has 33 theoretical plates (the number of plates is counted from top to bottom), and the mixed extractant contains 30wt% polyethylene glycol dimethyl ether (average relative molecular mass is 250) and 70wt% 1-hexyl-3 -Methylimidazolium hexafluorophosphate ([hmim][PF 6]) add from the 3rd tray, total flow is 9kg / h, the mixture of raw material dimethyl carbonate and methyl alcohol adds from the 29th tray, dimethyl carbonate content is 30wt%, methanol content is 70wt%, total The flow rate is 1kg / h, and the mass ratio of extractant to raw material is 5 at this time. The extractive distillation tower is operated under normal pressure, the top of the tower is fully condensed, the reflux ratio is 1.3, the output at the top of the tower is 0.7kg / h, 99.85wt% of methanol can be obtained, and the temperature of the top of the extractive distillation tower is 64°C. The temperature of th...

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Abstract

The invention relates to a method for separating dimethyl carbonate and methanol, which mainly solves the problem of unstable device operation during continuous production when ionic liquid is used as an extraction agent. The separation method is extractive distillation, and the extractive distillation adopts a mixed solvent of polyethylene glycol dimethyl ether and an ionic liquid whose anion is hexafluorophosphate as an extractant. The separation method can realize the continuous production of high-purity dimethyl carbonate and methanol, has stable product quality and device operation, and can be used in the industrial production of separating 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 continuous extraction rectification 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 proces...

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 李骏何文军
Owner CHINA PETROLEUM & CHEM CORP
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