Production technology of dimethyl carbonate

A dimethyl carbonate and production process technology, applied in the field of dimethyl carbonate production process, to achieve the effects of reducing energy consumption, increasing production capacity, and increasing output

Inactive Publication Date: 2017-06-20
SHANDONG DEPU CHEM IND SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing production process still has room for impro

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0010] The production technology of embodiment 1 dimethyl carbonate

[0011] In T1 (reactive distillation column), methanol and propylene carbon react under the action of catalyst sodium methoxide to form dimethyl carbonate, and the light component product dimethyl carbonate and raw material methanol formed by the reaction form an azeotrope and enter the column The vent balance tube on the top (condensing), wherein, the azeotrope formed by dimethyl carbonate and methanol is deeply condensed (introduced into the cryocooler by the vent balance tube), so that it changes from gas phase to liquid phase completely, After deep condensation, it is led to the +10m T4 feed tank by the frame +42 meters, thereby forming a jet self-priming, so that the pressure at the top of the T1 tower becomes a negative pressure state (adjust the pressure at the top of the T1 tower to -10KPa).

Embodiment 2

[0012] The production technology of embodiment 2 dimethyl carbonates

[0013] In T1 (reactive distillation column), methanol and propylene carbon react under the action of catalyst sodium methoxide to form dimethyl carbonate, and the light component product dimethyl carbonate and raw material methanol formed by the reaction form an azeotrope and enter the column The vent balance tube on the top (condensing), wherein, the azeotrope formed by dimethyl carbonate and methanol is deeply condensed (introduced into the cryocooler by the vent balance tube), so that it changes from gas phase to liquid phase completely, After deep condensation, it is led to the +10m T4 feed tank by the frame +42 meters, thereby forming a jet self-priming, making the pressure at the top of the T1 tower into a negative pressure state (adjust the pressure at the top of the T1 tower to -20KPa).

[0014] Production example: At present, the applicant has two sets of dimethyl carbonate production devices. The ...

example 1

[0015] Example 1: Application on an annual output of 12,000 tons of dimethyl carbonate production equipment

[0016] (1) when adjusting T1 tower top pressure down to-10KPa (method is with embodiment 1), the mass content of tower top dimethyl carbonate rises to 32% by 30% under normal pressure, thereby the production capacity of device is increased (32-30) / 30=6.67%, the annual increase of dimethyl ester products: 12000*6.67%=800.4 tons, calculated according to the profit of 1,000 yuan per ton of dimethyl carbonate production, the annual increase in benefits: 800*1000=800000 Yuan = 800,000 yuan;

[0017] (2) Due to the drop in the pressure at the top of the T1 tower, the temperature in the T1 tower dropped from 62.5°C under normal pressure to 57°C, reducing the amount of heating, thereby reducing the coal consumption per ton of dimethyl ester under normal pressure to 1.5 tons 1.3 tons, calculated according to the price of 750 yuan per ton of raw coal (Shanxi Shenmu), the annual...

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Abstract

The invention discloses a production technology of dimethyl carbonate. The production technology comprises the steps of enabling methanol to react with propyl carbon in presence of a catalyst-sodium methylate in a reactive distillation tower so as to generate dimethyl carbonate; enabling the light component product-dimethyl carbonate generated in the reaction and the raw material-methanol to form an azeotrope on the top of the tower, enabling the formed azeotrope to enter an emptying balance pipe arranged on the top of the tower, and carrying out deep condensation on the azeotrope formed by the dimethyl carbonate and the methanol so as to enable the azeotrope to be completely changed into a liquid phase from a gas phase; after the deep condensation is finished, introducing the azeotrope into a T4 feeding tank at the height of +10m or above from a frame at the height of +42m or above so as to form jetted self-priming, and enabling the pressure of the top of the T1 tower to be changed into a negative pressure state. According to the technology provided by the invention, the pressure of the top of the T1 tower is changed into a negative pressure state from normal pressure, components of a material on the top of the T1 tower are changed, and the content of dimethyl ester is increased to 38% from the original 30%, so that the yield of dimethyl ester products is improved; furthermore, because of the increment of the yield, the energy consumption is certainly reduced, and the one-time investment cost for equipment is lowered.

Description

technical field [0001] The invention relates to a production process of dimethyl carbonate, which belongs to the technical field of chemical industry. Background technique [0002] At present, the domestic production of dimethyl carbonate usually adopts the transesterification method. This method has advanced and mature technology, short process, stable operation, low investment, and no three wastes in the production process, which is clean and environmentally friendly. The most important one-step reaction in the transesterification method is that methanol, propylene carbon and sodium methoxide catalyst are carried out in T1 according to a certain ratio. This column is a reactive distillation column, and its reaction equation is: PC+2CH 3 OH—DMC+PG. Using the principle of rectification, the light component product dimethyl carbonate and raw material methanol formed by the reaction are separated from the top of the tower to form an azeotropic composition, while the heavy com...

Claims

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Application Information

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IPC IPC(8): C07C68/06C07C68/08C07C69/96
CPCC07C68/06C07C68/08C07C69/96Y02P20/10
Inventor 卢伟刘守国刘长峰卢建行
Owner SHANDONG DEPU CHEM IND SCI & TECH
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