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Heat pump reaction rectification technology for preparing glycol through hydration of epoxy ethane

A technology of ethylene oxide water and reactive distillation, which is applied in the field of organic chemical industry, can solve the problems of poor matching between reaction and separation, and achieve the effects of reducing separation costs, lowering tower bottom temperature, and improving economic efficiency

Inactive Publication Date: 2014-12-17
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Aiming at the shortcomings of poor reaction and separation matching in the above documents and patents, the purpose of the present invention is to provide a heat pump reactive distillation process for hydrating ethylene oxide to ethylene glycol, which can further reduce the feed-to-water ratio and increase the water conversion rate, improve the selectivity of ethylene glycol and reduce the energy consumption of the system

Method used

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  • Heat pump reaction rectification technology for preparing glycol through hydration of epoxy ethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 1As shown, the reactant water enters the reactive distillation tower (1) from the feed inlet (7) of the raw material water at the top of the tower, and ethylene oxide enters the reaction distillation tower (6) from the feed inlet (6) at the bottom of the tower of the reactive distillation tower. Distillation tower; in the reactive distillation tower, ethylene oxide first contacts with water to undergo a hydration reaction to generate ethylene glycol (EG), a high-boiling point component, and the generated ethylene glycol will also react with ethylene oxide to form a higher boiling point High diethylene glycol (DEG); the incompletely converted ethylene oxide and water in the tower rise to the top of the tower in a vapor state under rectification and return to the tower after being condensed by the top condenser (5) The reaction continues in the interior, and the high boiling point components EG, DEG and unconverted water leave the reaction zone under the ac...

Embodiment 2

[0037] The equipment and structural parameters of the tower are the same as in Example 1.

[0038] The operating conditions of the reactive distillation column are: water feed flow rate is 25.00 kmol / h, ethylene oxide feed flow rate is 25.00 kmol / h, water and ethylene oxide feed molar flow ratio is 1:1, operating pressure is 0.40MPa, and the tower top temperature is 144.00°C.

[0039] The operating conditions of the stripping tower are as follows: the operating pressure is 0.10MPa, the temperature at the top of the tower is 101.00°C, the temperature at the bottom of the tower is 176.00°C, heated by steam, and the reboiler operates with a reboiling ratio of 10.

[0040] The operating parameters of the throttling pressure reducing valve and the compressor are: the outlet pressure of the pressure reducing valve is 0.10Mpa, the power of the compressor is 1046.80 kW, and the outlet pressure of the compressor is 0.41 MPa.

[0041] The liquid phase product extracted from the bottom ...

Embodiment 3

[0044] The equipment and structural parameters of the tower are the same as in Example 1.

[0045] The operating conditions of the reactive distillation column are: water feed flow rate is 26.30 kmol / h, ethylene oxide feed flow rate is 25.00 kmol / h, water and ethylene oxide feed molar flow ratio is 1.05:1; operating pressure is 0.30MPa, and the temperature at the top of the tower is 134.00°C.

[0046] The operating conditions of the stripping tower are as follows: the operating pressure is 0.05MPa, the temperature at the top of the tower is 83.00°C, the temperature at the bottom of the tower is 142.00°C, the steam is heated, and the reboiler operates with a reboiler ratio of 9.

[0047] The operating parameters of the throttling pressure reducing valve and the compressor are: the outlet pressure of the pressure reducing valve is 0.05Mpa, the power of the compressor is 1357.90 kW, and the outlet pressure of the compressor is 0.31 MPa.

[0048] The liquid phase product extracte...

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Abstract

The invention relates to a heat pump reaction rectification technology for preparing glycol through hydration of epoxy ethane, which is characterized in that hydration reaction is conducted in a high-pressure operated reaction rectifying tower, the separation of reactants and products is conducted in a low-pressure operated stripping tower, a throttle pressure reducing valve and a compressor are arranged between the two towers, liquid mixture at the bottom of the reaction rectifying tower is directly used as liquid for reflux of the stripping tower after the pressure and the temperature of the liquid mixture are reduced through the pressure reducing valve, steam at the top of the stripping tower is directly used as rising steam after the temperature and the pressure of the steam are increased by the compressor, and the final products are obtained from the kettle of the stripping tower. The heat pump reaction rectification technology for preparing glycol through hydration of epoxy ethane can realize the effect that the high-temperature and high-pressure reaction and the low-temperature and low-pressure separation are synchronously conducted, and has the advantages of rapid reaction speed, low feed molar ratio of water and epoxy ethane, high epoxy ethane and water conversion, high glycol selectivity and low system energy consumption.

Description

technical field [0001] The invention relates to a heat pump reactive distillation process for preparing ethylene glycol by hydration of ethylene oxide, and belongs to the technical field of organic chemical industry. Background technique [0002] Ethylene glycol is an important organic chemical raw material, and its application fields involve the production of polyester fibers, antifreeze agents, unsaturated polyester resins, lubricants, plasticizers, nonionic surfactants, and explosives. There are many methods for producing ethylene glycol in the industry, among which the ethylene glycol hydration method of ethylene oxide is the main method used in industry today. The reaction formula for the hydration of ethylene oxide can be expressed as: [0003] C 2 h 4 O+H 2 O→C 2 h 6 o 2 (EG) [0004] The ethylene glycol (EG) produced by the reaction will continue to react with ethylene oxide to produce by-products such as diethylene glycol (DEG) and triethylene glycol. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/10C07C29/80
Inventor 安维中陈菲
Owner OCEAN UNIV OF CHINA