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Method for preparing ethylene carbonate using a tubular reactor with a static mixer

A tubular reactor, ethylene carbonate technology, applied in fluid mixers, chemical/physical/physicochemical stationary reactors, chemical instruments and methods, etc., can solve poor gas-liquid transfer efficiency, low reaction rate, Problems such as small phase interface, to achieve the effect of improving stability, accelerating mass transfer, and speeding up delivery

Active Publication Date: 2021-03-16
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to aim at the small phase interface of the gas phase raw material to the liquid phase reaction phase transfer in the existing carbon dioxide and alkylene oxide addition reaction technology, the gas-liquid transfer efficiency is poor, the reaction heat release is large, the energy consumption is large, and the reactant concentration is low. , the problem of low reaction rate, a method for preparing ethylene carbonate using a tubular reactor with a static mixer

Method used

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  • Method for preparing ethylene carbonate using a tubular reactor with a static mixer
  • Method for preparing ethylene carbonate using a tubular reactor with a static mixer
  • Method for preparing ethylene carbonate using a tubular reactor with a static mixer

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Synthesis of Ethylene Carbonate from Ethylene Oxide and Carbon Dioxide in a Tubular Reactor with Internal Static Mixer:

[0030] 1. Use a metering pump to continuously transport ethylene oxide and dissolved tetraethylammonium bromide and ZnBr respectively 2 of ethylene carbonate into the three-way pre-mixer.

[0031] 2. The mixed material is mixed with preheated CO in the second stage mixer 2 Premixed, CO 2 delivered by a mass flow meter.

[0032] 3. The mixed gas-liquid reaction raw materials are sent into a tubular reactor with an outer diameter of 12mm. The tubular reactor consists of a 500cm-long straight pipe section with an SK-type static mixer inside and a 1500cm-long empty pipe coil. The pipe sections are connected in series at intervals, and the reaction pipe is placed in a circulating oil bath with an oil temperature of 130°C.

[0033] 4. The end of the reaction tube adopts the back pressure of the gas-liquid back pressure valve. The reaction mixture enter...

Embodiment 2

[0040] Ethylene oxide and carbon dioxide are synthesized into ethylene carbonate in a tubular reactor equipped with a static mixer in which carbon dioxide is added step by step:

[0041] 1. Use a metering pump to continuously transport ethylene oxide and dissolved tetraethylammonium bromide and ZnBr respectively 2 of ethylene carbonate into the three-way pre-mixer.

[0042] 2. The mixed material is mixed with partially preheated CO in the second stage mixer 2 Premixed, CO 2 delivered by a mass flow meter.

[0043] 3. The mixed gas-liquid reaction raw materials are sent into a tubular reactor with an outer diameter of 12mm. The tubular reactor consists of a 500cm-long straight pipe section with an SK-type static mixer inside and a 1500cm-long empty pipe coil. The pipe sections are connected in series at intervals, and the total length of the reaction pipe section is 32m. In addition to introducing carbon dioxide into the second-stage mixer above, there are carbon dioxide fee...

Embodiment 3

[0051] Synthesis of propylene carbonate from propylene oxide and carbon dioxide in a tubular reactor with internal static mixer:

[0052] 1. Use a metering pump to continuously transport propylene oxide and dissolved tetraethylammonium bromide and ZnBr respectively 2 of propylene carbonate into the three-way pre-mixer.

[0053] 2. The mixed material is mixed with preheated CO in the second stage mixer 2 Premixed, CO 2 delivered by a mass flow meter.

[0054] 3. The mixed gas-liquid reaction raw materials are sent into a tubular reactor with an outer diameter of 12mm. The tubular reactor consists of a 500cm-long straight pipe section with an SK-type static mixer inside and a 1500cm-long empty pipe coil. The pipe sections are connected in series at intervals, and the reaction pipe is placed in a circulating oil bath with an oil temperature of 150°C.

[0055] 4. The end of the reaction tube adopts the back pressure of the gas-liquid back pressure valve. The reaction mixture e...

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Abstract

The invention provides a method for preparing ethylene carbonate by using a tubular reactor with an electrostatic mixer, belonging to the technical field of ethylene carbonate preparation. Including: 1) mixing and preheating raw materials ethylene oxide, carbon dioxide, catalyst solution, and the mixed gas-liquid mixture enters the reaction section composed of a tubular reactor with a static mixer; 2) exits from the tubular reactor Through the low-pressure flash evaporator, the vacuum flash evaporator removes unreacted carbon dioxide, ethylene oxide, and water light components successively; 3) the flash evaporator tower still liquid enters the ethylene carbonate distiller to separate the catalyst and ethylene carbonate, The top product can be used as ethylene carbonate industrial grade product, or rectified and purified to produce higher purity ethylene carbonate, and the bottom liquid of the tower can be reused as a circulating catalyst. The static mixer continuously mixes the reaction gas-liquid two-phase in real time during the reaction, so that the mass transfer of carbon dioxide to the liquid phase is accelerated, and the transfer of reaction heat to the pipe wall is accelerated, and the reaction rate and stability are improved.

Description

technical field [0001] The invention belongs to the technical field of ethylene carbonate preparation, in particular to a method for preparing ethylene carbonate by adopting a tubular reactor with a static mixer. Background technique [0002] Ethylene carbonate is a high-boiling-point organic solvent with excellent performance. It can dissolve various polymers. It is a good solvent for polyacrylonitrile and polyvinyl chloride. It is widely used in textile printing and dyeing industry and synthetic fiber industry. At the same time, ethylene carbonate can be used Used in the production of green basic chemical raw materials dimethyl carbonate, diethyl carbonate and other products by transesterification. This type of dialkyl carbonate can be used to replace the highly toxic raw material phosgene to produce high-performance engineering resins: polycarbonate; in addition, ethylene carbonate It can also be used as an active intermediate for the production of lubricating oil and gre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D317/38B01J19/24B01F5/06
CPCC07D317/38B01J19/2415B01F25/42
Inventor 程牧曦李博郑敏周飞王华韩伟梁衡潘相米谭亚南
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND