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System, method and reaction device for process for preparing trifluoroethane through continuous reaction

A reaction device, the technology of trifluoroethane, applied in the field of chemical engineering, can solve the problems of affecting the main reaction, affecting the utilization rate of raw materials, self-polymerization side reactions, etc.

Active Publication Date: 2021-04-27
BEIJING UNIV OF CHEM TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time of reaction, vinylidene chloride is prone to self-polymerization side reaction, which affects the utilization rate of raw materials, and the generated polymer is easy to cover catalyst molecules, which affects the progress of the main reaction

Method used

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  • System, method and reaction device for process for preparing trifluoroethane through continuous reaction
  • System, method and reaction device for process for preparing trifluoroethane through continuous reaction
  • System, method and reaction device for process for preparing trifluoroethane through continuous reaction

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Effect test

Embodiment 1

[0096] Adopt device and method of the present invention to prepare 1,1,1-trifluoroethane (HFC-143a) by continuous reaction, adopt SnCl Catalyst, the molar ratio of catalyst molecule and the vinylidene chloride substance of fresh feed is 0.2:1 wherein hydrogen fluoride and 1,1,1-trifluoroethane (HFC-143a) feed molar flow ratio is 3:1, the reaction temperature is 85 ℃, the system pressure is maintained at 1.2MPa, the supergravity level of the built-in supergravity reactor is 500g, the circulation ratio is 8:1. It was measured that the conversion rate of vinylidene chloride was 99.3%, and the mass fraction of HFC-143a (without hydrogen chloride) in the outlet gas was 99.8%.

Embodiment 2

[0098] Adopt device and method of the present invention to prepare 1,1,1-trifluoroethane (HFC-143a) by continuous reaction, adopt SnCl Catalyst, the molar ratio of catalyst molecule and the vinylidene chloride substance of fresh feed is 0.2:1 wherein hydrogen fluoride and 1,1,1-trifluoroethane (HFC-143a) feed molar flow ratio is 4:1, the reaction temperature is 85 ° C, the system pressure is maintained at 1.2MPa, the supergravity level of the built-in supergravity reactor is 600g, the circulation ratio is 10:1. It was measured that the conversion rate of vinylidene chloride was 99.8%, and the mass fraction of HFC-143a (without hydrogen chloride) in the outlet gas was 99.9%.

Embodiment 3

[0100] Adopt device and method of the present invention to prepare 1,1,1-trifluoroethane (HFC-143a) by continuous reaction, adopt SnCl Catalyst, the molar ratio of catalyst molecule and the vinylidene chloride substance of fresh feed is 0.2:1 wherein hydrogen fluoride and 1,1,1-trifluoroethane (HFC-143a) feed molar flow ratio is 3:1, the reaction temperature is 80 ℃, the system pressure is maintained at 1.2MPa, the supergravity level of the built-in supergravity reactor is 300g, the circulation ratio is 8:1. It was measured that the conversion rate of vinylidene chloride was 98.9%, and the mass fraction of HFC-143a (without hydrogen chloride) in the outlet gas was 99.4%.

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Abstract

The invention provides a system, method and reaction device for a process for preparing trifluoroethane through continuous reaction. The reaction device comprises an immersed pump and a deflector which are combined for use, the deflector comprises two baffle plate groups, and each baffle plate group comprises a plurality of baffle plates; the two baffle plate groups are respectively fixed on two opposite side walls, and two adjacent baffle plates are staggered, so that on one hand, the immersed pump is arranged in the reaction cavity, a liquid inlet pipeline can be directly connected into the immersed pump, additional pipeline arrangement is not needed, and the problem that an external pump cannot maintain the sufficient pressureduring high-pressure reaction is solved. The reaction safety coefficient is improved, the baffle plates are arranged at a gas leading-out channel of the reactor so as to integrate the gas-liquid separation, the equipment integration can be suitable for the high pressure reaction, and the reaction device of the present invention is especially suitable for the preparation of 1,1,1-trifluoroethane (HFC-143a).

Description

technical field [0001] The invention relates to the technical field of chemical engineering, and more specifically, relates to a system, a method and a reaction device for a continuous reaction process for preparing trifluoroethane. Background technique [0002] 1,1,1-Trifluoroethane (HFC-143a) is the third-generation new environmentally friendly refrigerant and one of the important components of new mixed refrigerants R404A and R507 that replace R502. At present, the main routes for producing HFC-143a are HCFC-141b route, HCFC-142b route and vinylidene chloride route, and its production process is divided into gas phase method and liquid phase method. Vinylidene chloride addition fluorination method has become the mainstream process for industrial production of HFC-143a because of its cheap and easy-to-obtain raw materials and low production cost. [0003] Its reaction equation is as follows: [0004] CH 2 =CCl 2 +HF→CH 3 CCl 2 F(HCFC-141b) addition 1 [0005] CH 3 ...

Claims

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Application Information

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IPC IPC(8): B01J8/10B01J3/04B01J3/00C07C17/087C07C17/38C07C19/08
CPCB01J8/10B01J8/008B01J3/002B01J3/04C07C17/087C07C17/38C07C19/08Y02P20/10C07C17/21B01J19/18B01J2219/00101B01J2219/00094B01J2219/0077C07C17/25
Inventor 张亮亮周黎旸初广文洪江永张一栋陈建峰杨波孙宝昌邱正毅邹海魁
Owner BEIJING UNIV OF CHEM TECH
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