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A method for the production of r22 and r21 by pipeline polygeneration by liquid phase method

A pipelined, R21 technology, applied in the field of liquid-phase pipelined multi-generation production of R22 and R21, can solve the problems of unsuitability for actual production, corrosion of reactors, and large safety hazards, and overcome local concentration unevenness, increase Effect of mass transfer and reduction of production cost

Active Publication Date: 2021-01-26
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing process for preparing polygeneration R21 and R22 usually adopts the liquid phase fluorination method, but there is a problem of serious corrosion of the reactor, which has the disadvantages of severe corrosion, large safety hazards, and high energy consumption. The reactor material of this method Need to use Harbin alloy, high equipment cost, difficult processing, not suitable for actual production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for the production of R22 and R21 by pipeline polygeneration by liquid phase method,

[0038] The method comprises the steps of:

[0039] (1) The raw material is pumped in from the inlet of the pipeline reactor, and the pipeline reactor includes a heating segment group and a cooling segment group, and the raw material includes chloroform, hydrogen fluoride and a fluorination catalyst, and the raw material is The reactor is mixed into a reaction liquid, so that in the presence of the fluorination catalyst, chloroform and hydrogen fluoride are contacted in the pipelined reactor, thereby performing a fluorination reaction, and obtaining a reaction liquid stream comprising R22 and R21;

[0040] (2) Partial R21 is sequentially separated from the reaction liquid flow in step (1), and after forming the R21 product flow, the remaining reaction liquid flow continues to be fluorinated in the pipeline reactor to obtain The reaction liquid stream;

[0041] (3) R22 is sep...

Embodiment 2

[0049] The difference between embodiment 2 and embodiment 1 is that in the piped reactor of embodiment 2, in the heating section of the piped reactor, except the first section of the heating section, the rest of the heating section of the piped reactor The function of adding hydrogen fluoride to the reactor at the front end is to maintain the concentration of hydrogen fluoride in the reaction liquid. The concentration of hydrogen fluoride in the reaction liquid is in the normal range, preventing the concentration of hydrogen fluoride in the reaction liquid from being too low to affect the fluorination reaction speed. For other relevant technical features not listed in Embodiment 2, refer to Embodiment 1.

[0050] A method for the production of R22 and R21 by pipeline polygeneration by liquid phase method,

[0051] The method comprises the steps of:

[0052] (1) The raw material is pumped in from the inlet of the pipeline reactor, and the pipeline reactor includes a heating s...

Embodiment 3

[0062] Embodiment 3, the difference from Embodiment 1 and Embodiment 2 is that before the liquid phase material of Embodiment 3 is pumped back to the pipelined reactor, the solid matter in the liquid phase material is filtered out through a filtering device; Further, transfer the solid matter to the fluorination catalyst reactivation equipment for reactivation to obtain the reactivated fluorination catalyst, and pump it back to the pipeline reactor, the function is to keep the reaction liquid fluorination catalyst concentration, so as to ensure the speed of fluorination reaction. For other relevant technical features not listed in Embodiment 3, refer to Embodiment 1 or Embodiment 2.

[0063] A method for the production of R22 and R21 by pipeline polygeneration by liquid phase method,

[0064] The method comprises the steps of:

[0065] (1) The raw material is pumped in from the inlet of the pipeline reactor, and the pipeline reactor includes a heating segment group and a coo...

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Abstract

The invention discloses a method for producing R22 and R21 through pipelined polygeneration using a liquid phase method. The method includes the following steps: (1) Pumping raw materials from the inlet of the pipelined reactor, so that in the presence of a fluorination catalyst, Trichloromethane and hydrogen fluoride are contacted in the pipelined reactor to perform a fluorination reaction to obtain a reaction liquid stream containing R22 and R21; (2) sequentially separate parts of the reaction liquid stream from step (1) of R21, and the remaining reaction liquid stream continues to perform a fluorination reaction in the pipeline reactor to obtain a reaction liquid stream containing R22; (3) separate R22 from the reaction liquid stream containing R22 in step (2), The remaining reaction liquid stream is recycled to step (1). By providing a method for the polygeneration of R21 and R22, the present invention enables the production of R22 and R21 to have the characteristics of small online reaction volume, small safety hazards, easy reaction control, continuous production, and low production cost.

Description

technical field [0001] The invention relates to a method for producing R22 and R21 by pipeline polygeneration in a liquid phase method. Background technique [0002] Polygeneration R21 and R22, as a class of substances, have a variety of different applications, including as chemical intermediates, blowing agents and refrigerants. [0003] The increasing demand for environmentally friendly fluorocarbons for use as refrigerants, blowing agents and solvents constantly stimulates research into economically attractive solutions for their production. The polyproducts R21 and R22 produced by the process of the present invention may themselves be used as refrigerants, blowing agents or solvents, or as intermediates in the production of other haloalkanes that meet the same needs. [0004] The existing process for preparing polygeneration R21 and R22 usually adopts the liquid phase fluorination method, but there is a problem of serious corrosion of the reactor, which has the disadvan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/20C07C19/10
CPCC07C17/206C07C19/10
Inventor 沈涛徐志雄钱超陈朝阳符仁华
Owner ZHEJIANG UNIV
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