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Control method of ethylene carbonate synthesis process

A technology for ethylene carbonate and synthesis process, which is applied in the control field of ethylene carbonate synthesis process, and can solve the problems of low product purity, reduced circulation amount, complexity and the like

Active Publication Date: 2017-03-08
CHINA PETROLEUM & CHEM CORP +1
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  • 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 existing ethylene carbonate synthesis process has the following key problems: (1) the heat of reaction is large, which can easily cause the bed to overheat; (2) the fluctuation of the liquid level in the reactor can easily cause ethylene oxide The residence time of alkane in the reactor is insufficient, resulting in low product purity; (3) the gas enters the circulation pump, which easily reduces the circulation volume instantly, causing the reactor to overheat; (4) complex process control and slow response of the control scheme, etc.

Method used

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  • Control method of ethylene carbonate synthesis process
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Examples

Experimental program
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Effect test

Embodiment 1

[0044] Combine below figure 1 Example 1 will be described.

[0045] process such as figure 1 Shown, the flow rate of ethylene oxide feed (S.1) is 100kg / h, enters the top of one-stage synthesis reactor (1), and the flow rate of carbon dioxide feed (S.2) is 100kg / h, by the second stage synthesis reaction Add at the bottom of the device (5). The pressure of the first-stage synthesis reactor is controlled at 2.5MPa by the pressure control valve of the top gas phase pipeline. The gas phase space between the reactor and the circulation pump buffer tank (3) is connected by a balance pipe. Controlled by the control valve, the temperature rise in the reactor is controlled at about 20°C by the flow control valve of the circulating material. The reactor inlet temperature was 80°C. When the system is stable, the temperature of the liquid phase stream (S.6) obtained at the bottom of the first section of synthesis reactor is about 100°C, and enters the circulation pump buffer tank (3)...

Embodiment 2

[0050] Combine below figure 1 Example 2 will be described.

[0051] process such as figure 1 Shown, the flow rate of ethylene oxide feed (S.1) is 100kg / h, enters the top of one-stage synthesis reactor (1), and the flow rate of carbon dioxide feed (S.2) is 100kg / h, by the second stage synthesis reaction Add at the bottom of the device (5). The pressure of the first-stage synthesis reactor is controlled at 1.5MPa by the pressure control valve of the top gas phase pipeline. The gas phase space between the reactor and the circulation pump buffer tank (3) is connected by a balance pipe. The control valve controls the temperature of the lower layer of the catalyst bed in the reactor to be controlled at about 100°C by the flow control valve of the circulating material. The reactor inlet temperature was 80°C. When the system is stable, the temperature of the liquid phase stream (S.6) obtained at the bottom of the first section of synthesis reactor is about 100°C, and enters the ...

Embodiment 3

[0056] Combine below figure 1 Example 3 will be described.

[0057] process such as figure 1 Shown, the flow rate of ethylene oxide feed (S.1) is 100kg / h, enters the top of one-stage synthesis reactor (1), and the flow rate of carbon dioxide feed (S.2) is 100kg / h, by the second stage synthesis reaction Add at the bottom of the device (5). The pressure of the first-stage synthesis reactor is controlled at 3.0MPa by the pressure control valve of the gas phase pipeline at the top, and the gas phase space between the reactor and the buffer tank (3) of the circulation pump is connected by a balance pipe, and the liquid level of the buffer tank of the circulation pump is from the first stage to the liquid phase production flow of the second stage Controlled by the control valve, the temperature of the lower layer of the catalyst bed in the reactor is controlled at about 115°C by the flow control valve of the circulating material. The reactor inlet temperature was 90°C. When th...

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Abstract

The invention relates to a control method of an ethylene carbonate synthesis process. According to the invention, ethylene carbonate is synthesized through a gas-liquid-solid three-phase reaction with carbon dioxide and ethylene oxide. The method is mainly provided for solving the problems of temperature runaway and low product purity of prior arts. According to the invention, key process control indicators of the reaction are controlled with an automatic control system. A catalyst is fixed with porous baffles in a reaction bed layer. Liquid-phase and gas-phase raw materials respectively enter from the upper part and the lower part of the reactor. Catalyst bed layer temperature rise in the reactor is controlled with outer circulation material flow, such that the bed layer temperature rise is controlled within a certain range. Product purity is controlled with secondary reactor outlet liquid phase output amount. With the technical scheme, the problems are well solved. The method can be applied in industrial productions of ethylene carbonate synthesis.

Description

technical field [0001] The invention relates to a control method for the synthetic process of ethylene carbonate, in particular to a control method for the synthetic 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 methods 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 environmenta...

Claims

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Application Information

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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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