A method for preparing high-purity ethyl methyl carbonate in a partitioning reactive distillation column

A technology of reactive distillation column and ethyl methyl carbonate, which is applied in the field of preparation of high-purity ethyl methyl carbonate, can solve the problems of low selective yield, equipment cost and high process energy consumption, achieve simple operation mode and alleviate overcapacity , the effect of increasing concentration

Active Publication Date: 2021-07-27
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcoming of this technique is: the selectivity of reaction and the yield of EMC are very low, and the product ratio of finally obtaining EMC and DEC is only 1:1 at most; This technique has included 3 complete tower bodies, so its equipment cost and process energy consumption is very high

Method used

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  • A method for preparing high-purity ethyl methyl carbonate in a partitioning reactive distillation column
  • A method for preparing high-purity ethyl methyl carbonate in a partitioning reactive distillation column

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Embodiment 1

[0023] process such as figure 1 As shown, the mixed feed DMC and ethanol are mixed at a ratio of 1.35:1, preheated to 50°C, specifically, the DMC flow rate is 2500kg / h, the ethanol flow rate is 950kg / h, and the feed is fed from the ninth plate of the main tower T1. The single-strand DMC is also preheated to 50°C, and the feed is fed from the 8th plate at a flow rate of 1200kg / h. The position of the DEC cycle feed is the 7th plate. The number of plates in the reaction section is 9, and the number of plates in the stripping section is 37. The number of plates in the common stripping section is 10, and the reflux ratio is 3.71; the total number of plates in the sub-column T2 is 30, and the reflux ratio is 4.03; after the raw materials are fully reacted in the reaction section, the methanol and a small amount of unreacted DMC generated from T1 Extracted from the top of the tower, the output is 979.7kg / h; the vapor phase at the bottom of the stripping section of T1 is extracted to...

Embodiment 2

[0026] process such as figure 1 As shown, the mixed feed DMC and ethanol are mixed at a ratio of 1.35:1, preheated to 50°C, specifically, the DMC flow rate is 2500kg / h, the ethanol flow rate is 950kg / h, and the feed is fed from the ninth plate of the main tower T1. The single-strand DMC is also preheated to 50°C, and the feed is fed from the 8th plate at a flow rate of 1200kg / h. The position of the DEC cycle feed is the 7th plate. The number of plates in the reaction section is 9, and the number of plates in the stripping section is 33. The number of plates in the common stripping section is 10, and the reflux ratio is 3.71; the total number of plates in the sub-column T2 is 30, and the reflux ratio is 4.03; after the raw materials are fully reacted in the reaction section, the methanol and a small amount of unreacted DMC generated from T1 Extracted from the top of the tower, the output is 979.7kg / h; the vapor phase at the bottom of the stripping section of T1 is extracted to...

Embodiment 3

[0029] process such as figure 1 As shown, the mixed feed DMC and ethanol are mixed at a ratio of 1.35:1, preheated to 50°C, specifically, the DMC flow rate is 2500kg / h, the ethanol flow rate is 950kg / h, and the feed is fed from the ninth plate of the main tower T1. The single-strand DMC is also preheated to 50°C, and the feed is fed from the 8th plate at a flow rate of 1200kg / h. The position of the DEC cycle feed is the 7th plate. The number of plates in the reaction section is 9, and the number of plates in the stripping section is 30. The number of plates in the common stripping section is 10, and the reflux ratio is 3.71; the total number of plates in the sub-column T2 is 30, and the reflux ratio is 4.03; after the raw materials are fully reacted in the reaction section, the methanol and a small amount of unreacted DMC generated from T1 Extracted from the top of the tower, the output is 979.7kg / h; the vapor phase at the bottom of the stripping section of T1 is extracted to...

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Abstract

The invention discloses a method for preparing high-purity ethyl methyl carbonate in a partition-type reactive distillation tower. Dimethyl carbonate (DMC) and ethanol are prepared in a partitioned reactive distillation column consisting of a reaction section, a stripping section, a common stripping section and a product section to prepare high-purity ethyl methyl carbonate. DMC is fed in two streams, one is mixed with ethanol from the bottom of the reaction section of the main column T1 of the dividing wall reactive distillation column, and the other is fed from the lower part of the reaction section of T1. The catalyst is packed in the reaction section, and DMC and ethanol react in the main tower T1 under the action of the catalyst to form ethyl methyl carbonate and diethyl carbonate; the sub-column T2 of the dividing wall reactive distillation column has only a condenser and no reboiler The product refining tower is used to refine the stream coming from the bottom of the stripping section of the main tower T1, and obtain high-purity ethyl methyl carbonate product from the top of the T2 tower; the DEC of the main tower T1 tower tank is recycled into the reaction section of T1, Used to inhibit the production of DEC, thereby improving the selectivity of the reaction.

Description

technical field [0001] The invention belongs to the technical field of preparing high-purity ethyl methyl carbonate, and in particular relates to a method for preparing high-purity ethyl methyl carbonate by adopting a partition-type reactive distillation tower. Background technique [0002] Ethyl methyl carbonate (EMC) is an environmentally friendly green asymmetric carbonate, which has the characteristics of diethyl carbonate and dimethyl carbonate, can react with alcohols, esters, phenols and amines, and is suitable for Various organic reactions. Moreover, as a new type of electrolyte for lithium-ion batteries, ethyl methyl carbonate has low viscosity, high dielectric constant and better solubility to lithium salts, so it has the advantages of improving the discharge capacity and energy density of batteries. And it can improve the safety performance of the lithium-ion battery and prolong the service life. In addition, good low-temperature performance is also its advantag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C68/06C07C68/08C07C69/96
CPCY02P20/10
Inventor 王红星周庆邱挺黄智贤叶长燊王晓达李玲王清莲陈锦溢
Owner FUZHOU UNIV
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