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Process and apparatus for preparing diethyl carbonate

A technology of diethyl carbonate and a process method is applied in the field of technology and equipment for producing diethyl carbonate, and can solve problems such as a large amount of ethanol circulating

Inactive Publication Date: 2009-02-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the method ethanol circulation is too large

Method used

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  • Process and apparatus for preparing diethyl carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: as figure 1 process shown.

[0026] In a process equipment mainly composed of reactive distillation dividing wall column (11), condenser (12,17), reboiler (10), evaporator (15), mixer (19,20), raw material carbonic acid Diethyl carbonate is prepared from dimethyl ester and ethanol under the action of catalyst potassium carbonate.

[0027] The reactive distillation dividing wall column (11) is a tray column with a diameter of 2000 mm and a height of 22000 mm. The internal actual tray arrangement: 9 public rectification sections (4), 16 reaction sections (5), and 16 side line sections (6) , 15 pieces of public stripping section (7).

[0028] Reactive distillation dividing wall column (11) operating conditions:

[0029]Fresh feed dimethyl carbonate enters the middle part of the reaction section (4) of reactive distillation dividing wall column (11) with the mass flow rate of 1414.8kg / h, ethanol with the mass flow rate of 1447.1kg / h, and catalyst salt of wo...

Embodiment 2

[0030] Embodiment 2: as figure 1 process shown.

[0031] In a process equipment mainly composed of reactive distillation dividing wall column (11), condenser (12,17), reboiler (10), evaporator (15), mixer (19,20), raw material carbonic acid Diethyl carbonate is prepared from dimethyl ester and ethanol under the action of catalyst sodium hydroxide.

[0032] The reactive distillation dividing wall tower (11) is a packed tower with a diameter of 1600mm and a height of 18000mm. The height of the packing layer is: public rectification section (4) 2600mm, reaction section (5) 4600mm, side line section (6) 4600mm, public stripping section (7) 4300mm.

[0033] Reactive distillation dividing wall column (11) operating conditions:

[0034] The feeding position, raw material and catalyst feeding amount are the same as in Example 1, the tower top reflux ratio is 6, the tower top temperature is 64.5°C, the tower bottom temperature is 126.8°C, the reaction zone temperature is 76.1~100.9°...

Embodiment 3

[0035] Embodiment 3: as figure 1 process shown.

[0036] In a process equipment mainly composed of reactive distillation dividing wall column (11), condenser (12,17), reboiler (10), evaporator (15), mixer (19,20), raw material carbonic acid Diethyl carbonate is prepared from dimethyl ester and ethanol under the action of catalyst potassium hydroxide.

[0037] The reactive distillation dividing wall column (11) is a tray column with a diameter of 2400 mm and a height of 23500 mm. The internal actual tray arrangement: 10 public rectification sections (4), 17 reaction sections (5), and 17 side line sections (6) , 16 blocks of common stripping section (7).

[0038] Reactive distillation dividing wall column (11) operating conditions:

[0039] The feeding position, raw material and catalyst feeding amount are the same as in Example 1, the top reflux ratio is 15, the tower top temperature is 64.5°C, the tower bottom temperature is 126.8°C, the reaction section temperature is 84.7...

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Abstract

The present invention discloses a technological method of producing diethyl carbonate with a reaction distillation bulkhead column, and a device thereof. The reaction distillation bulkhead column is characterized in that a bulkhead is arranged in the vertical direction in a conventional distillation column, and the whole column is divided into four zones: a public distillation zone, a reaction zone, a side line zone and a public stripping zone. Methyl carbonate and ethyl alcohol are used as raw materials, diethyl carbonate and methanol are generated in the reaction zone through transesterification reaction with catalyst, the byproduct methanol with a concentration more than 95 percent is generated at the column top, the product diethyl carbonate with a concentration more than 99.5 percent can be prepared after the catalyst and the diethyl carbonate in the column reactor are separated, the separated catalyst, and the methyl ethyl carbonate, ethyl alcohol, diethyl carbonate and methanol, which are collected from the side line, can be recycled. The advantages of the bulkhead column and the reaction distillation are fully developed in the present invention, the transesterification reaction and the product separation can be realized in one column, and the equipment investment and the energy consumption can be effectively reduced.

Description

technical field [0001] The invention relates to a reactive distillation process and equipment, in particular to a novel process and equipment for synthesizing diethyl carbonate by using a reactive distillation dividing wall tower, which can combine the synthesis and product separation of diethyl carbonate products Complete within one tower. Background technique [0002] Diethyl carbonate is a solvent with excellent performance and an important intermediate in organic synthesis. It is widely used in synthetic fiber, synthetic resin, pharmaceutical and other industries. It can be used as an electrolyte solvent for lithium batteries. It is also a gasoline additive with excellent performance. High industrial application value. [0003] The traditional method for synthesizing diethyl carbonate is the phosgene method, first reacting phosgene with boiling ethanol to generate methyl chloroformate, and then reacting the generated methyl chloroformate with absolute ethanol to obtain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/96C07C68/06
Inventor 孙兰义徐金川李军郭晓燕李青松
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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