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Control method for ethylene carbonate synthesis process

A technology of ethylene carbonate synthesis process, which is applied in the field of control of ethylene carbonate synthesis process, can solve the problems of reactor overheating, circulation reduction, bed overheating, etc., and achieve good technical effects

Active Publication Date: 2017-03-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the following key problems exist in the existing ethylene carbonate synthesis process. The first is that the fluctuation of the external circulation volume can easily cause the bed to overheat due to the large amount of heat released by the reaction; the second is that the fluctuation of the liquid level in the reactor is easy to cause The residence time of ethylene oxide in the reactor is insufficient, resulting in low product purity; third, the gas entering the circulation pump is easy to reduce the circulation volume instantly, causing the reactor to overheat

Method used

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  • Control method for ethylene carbonate synthesis process
  • Control method for ethylene carbonate synthesis process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Combine below figure 1 Example 1 will be described.

[0044] process such as figure 1 Shown, ethylene oxide feed (S.1) flow rate is 100kg / h, enters the top of one section synthesis reactor (1), carbon dioxide feed (S.2) flow rate is 100kg / h, and 95% wherein enters The lower part of the first-stage synthesis reactor (3), the reactor pressure is controlled at 2.5MPa by the gas phase pipeline pressure control valve, the liquid level in the reactor is controlled by the first-stage to the second-stage liquid phase production flow control valve, and the temperature rise in the reactor is controlled by the circulation The material flow control valve is controlled at about 20°C. The reactor inlet temperature was 80°C. When the system is stable, the temperature of the liquid stream (S.6) obtained at the bottom of the first section of synthesis reactor is about 100°C, and enters the buffer tank (3) of the circulation pump. The liquid level in the buffer tank is indirectly cont...

Embodiment 2

[0049] Combine below figure 1 Example 2 will be described.

[0050] process such as figure 1 Shown, oxirane feeding (S.1) flow rate is 100kg / h, enters the top of one section synthesis reactor (1), and carbon dioxide feeding (S.2) flow rate is 100kg / h, and 80% wherein enters The lower part of the first-stage synthesis reactor (3), the reactor pressure is controlled at 1.5MPa by the gas phase pipeline pressure control valve, the liquid level in the reactor is controlled by the first-stage to the second-stage liquid phase production flow control valve, and the lower layer of the catalyst bed in the reactor The temperature was controlled at about 100°C by a recycle material flow control valve. The reactor inlet temperature was 80°C. When the system is stable, the temperature of the liquid stream (S.6) obtained at the bottom of the first section of synthesis reactor is about 100°C, and enters the buffer tank (3) of the circulation pump. The liquid level in the buffer tank is ind...

Embodiment 3

[0055] Combine below figure 1 Example 3 will be described.

[0056] process such as figure 1 Shown, oxirane feeding (S.1) flow rate is 100kg / h, enters the top of one section synthesis reactor (1), and carbon dioxide feeding (S.2) flow rate is 100kg / h, and 70% wherein enters The lower part of the first-stage synthesis reactor (3), the reactor pressure is controlled at 3.0MPa by the gas phase pipeline pressure control valve, the liquid level in the reactor is controlled by the first-stage to the second-stage liquid phase production flow control valve, and the temperature rise in the reactor is controlled by the circulation The material flow control valve is controlled at about 15°C. The reactor inlet temperature was 90°C. When the system is stable, the temperature of the liquid stream (S.6) obtained at the bottom of the first section of the synthesis reactor is about 105°C, and enters the buffer tank (3) of the circulating pump. The liquid level in the buffer tank is controll...

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Abstract

The control method relates to a control method for an ethylene carbonate synthesis process; a gas-liquid-solid three-phase reaction of carbon dioxide and ethylene oxide is preformed to generate ethylene carbonate, and the problems of easy temperature runaway and low purity of a product existing in the prior art are mainly solved. The problems are relatively well solved by adopting the technical scheme that key process control indexes of the reaction are controlled by an automatic control system, a catalyst is fixed by a porous baffle plate in a reactor bed layer, a liquid-phase raw material and a gas-phase raw material respectively enter from the upper part and the lower part of the reactor, a one-section synthesis reactor liquid level is controlled by using the output quantity of a one-section synthesis reactor outlet liquid phase, and the purity of the product is controlled by using the output quantity of a two-section synthesis reactor outlet liquid phase. The control method can be used for industrialized production of ethylene carbonate synthesis.

Description

technical field [0001] The invention relates to a control method for the synthesis process of ethylene carbonate, in particular to a control method for the synthesis process of ethylene carbonate catalyzed by ethylene oxide and carbon dioxide. Background technique [0002] Ethylene carbonate (EC) is an excellent polar high boiling point solvent and an important raw material for organic synthesis. In the second half of the 20th century, researchers from various countries carried out numerous studies on the synthesis of carbonates, and many new synthesis processes and new catalysts were discovered. The traditional production method of EC is the phosgene method, but it has the disadvantages of long process flow, low yield, high cost, etc., and phosgene is highly toxic and pollutes seriously, and its use has basically been stopped in developed countries. with CO 2 Direct esterification with EO as raw materials to prepare ethylene carbonate is an efficient, green and environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/38
CPCC07D317/38
Inventor 曹君贺来宾杨卫胜孙翟宗刘银川
Owner CHINA PETROLEUM & CHEM CORP
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