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A method for producing r243, r244 and r245 by pipeline polygeneration by liquid phase method

A pipeline and polygeneration technology, applied in chemical instruments and methods, organic chemistry, dehydrohalogenation preparation, etc., can solve the problems of high energy consumption, corroded reactors, high equipment cost, etc., to simplify equipment process, increase transmission Quality, to achieve the effect of continuous production

Active Publication Date: 2021-02-26
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The existing liquid-phase preparation process of R245 usually adopts the kettle-type liquid-phase fluorination method, which has the problem of serious corrosion of the reactor, and has the disadvantages of severe corrosion, large safety hazards, and high energy consumption. However, for corrosion-resistant reactor materials Harbin alloys are rarely used in actual production due to the difficulty in processing kettle-type equipment and the high cost of equipment

Method used

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  • A method for producing r243, r244 and r245 by pipeline polygeneration by liquid phase method
  • A method for producing r243, r244 and r245 by pipeline polygeneration by liquid phase method

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Experimental program
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Embodiment 1

[0034] 1. a method for the production of R243, R244 and R245 by liquid-phase pipeline polygeneration, characterized in that,

[0035] The method comprises the steps of:

[0036] (1) The raw material is pumped in from the inlet of the pipeline reactor, and the pipeline reactor includes a heating section group and a cooling section group, and the raw material includes 1,1,1,3,3-pentachloropropane, hydrogen fluoride and A fluorination catalyst, the raw materials are mixed into a reaction solution in a pipeline reactor, so that in the presence of the fluorination catalyst, 1,1,1,3,3-pentachloropropane and hydrogen fluoride are mixed in the pipeline reactor Contacting, thereby carrying out fluorination reaction, obtains the reaction liquid flow that comprises R243, R244 and R245;

[0037] (2) From the reaction liquid flow of step (1), separate out part R243 and R244 successively, after forming R243 product flow and R244 product flow, remaining reaction liquid flow continues to carry...

Embodiment 2

[0048] The difference between embodiment 2 and embodiment 1 is that, in the pipeline reactor of embodiment 2, hydrogen fluoride is supplemented into the pipeline reactor from the front end of the heating section group, so that there is enough hydrogen fluoride to make step (1) And (2) the molar ratio of hydrogen fluoride to R243 is at least 20:1, and the molar ratio of hydrogen fluoride to R244 is at least 20:1; Effect is to keep the concentration of hydrogen fluoride in the reaction solution, prevent the concentration of hydrogen fluoride in the reaction solution from being too high on the one hand. High side reactions will also corrode the pipes of the piped reactor. On the other hand, keep the concentration of hydrogen fluoride in the reaction solution in the normal range to prevent the concentration of hydrogen fluoride in the reaction solution from being too low to affect the fluorination reaction speed. For other relevant technical features not listed in Embodiment 2, ref...

Embodiment 3

[0059] 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.

[0060] A method for the production of R243, R244 and R245 by pipeline polygeneration in a liquid phase method,

[0061] (1) The raw material is pumped in from the inlet of the pipeline reactor, and the pipeline reactor includes a heating section group and a cooling section group, and the raw mat...

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Abstract

The invention discloses a method for producing R243, R244 and R245 through liquid phase method pipeline polygeneration. The method comprises the following steps: (1) pumping raw materials from the inlet of a pipeline reactor, enabling 1,1,1,3,3-pentachloropropane and hydrogen fluoride to be in contact in the pipeline reactor in the presence of a fluorination catalyst, and performing a fluorinationreaction so as to obtain a reaction fluid flow with R243, R244 and R245; (2) sequentially separating a part of R243 and R244 from the reaction fluid flow in the step (1), and performing the fluorination reaction on the remaining reaction fluid flow continuously in the pipeline reactor so as to obtain a reaction fluid flow containing R245; and (3) separating R245 from the reaction fluid flow containing R245 in the step (2), and recycling the remaining reaction fluid flow to the step (1). By providing the method for polygeneration of R243, R244 and R245, production of R243, R244 and R245 has the characteristics of being small in on-line reaction volume, small in safety hidden trouble, easy in reaction control, possible in continuous production and low in production cost.

Description

technical field [0001] The invention relates to a method for producing R243, R244 and R245 by pipeline polygeneration in a liquid phase method. Background technique [0002] Polygeneration R243, R244 and R245 as a class of substances have a variety of different applications including as chemical intermediates, blowing agents and refrigerants. [0003] The ever-increasing demand for environmentally-friendly fluorocarbons for use as refrigerants, blowing agents and solvents constantly stimulates the search for economically attractive solutions to their production. The polyproducts R243, R244 and R245 produced by the process of the present invention can be used as refrigerants, blowing agents or solvents themselves, or as intermediates for the production of other halogenated alkanes that meet the same needs. [0004] The existing liquid-phase preparation process of R245 usually adopts the kettle-type liquid-phase fluorination method, which has the problem of serious corrosion ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/25C07C17/20C07C19/08C07C19/10C07C21/18C07C21/22B01J19/00B01J8/08
CPCB01J8/087B01J19/0013B01J19/0053B01J2219/00121B01J2219/00166C07C17/206C07C17/25C07C19/08C07C19/10C07C21/18C07C21/22
Inventor 钱超徐志雄沈涛葛建飞张伟
Owner ZHEJIANG UNIV
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