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Method for preparing 1,1-difluoro-1,2-dichloroethane

A technology of dichloroethane and trichloroethylene, which is applied in the field of preparation of 1,1-difluoro-1,2-dichloroethane, can solve the problems of low reaction conversion rate and selectivity, and high reaction temperature, and achieve The effect of high selectivity and yield, simple method, and easy industrial production

Inactive Publication Date: 2014-01-15
SINOCHEM LANTIAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two R132b patent preparation methods all have the disadvantages of high reaction temperature, low reaction conversion rate and low selectivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put 50Kg of antimony pentachloride fluorination catalyst into the 600L reactor, add 50Kg of anhydrous hydrofluoric acid into the reactor at one time, and then add 4Kg of anhydrous hydrofluoric acid every hour to raise the temperature of the reactor, and the heating time is controlled After 5 hours, when the temperature rises to about 70° C., keep the temperature constant for 3 hours to ensure that the catalyst is activated. Then open the reaction jacket freezing medium to cool the reactor for 4 hours, when the temperature drops to 45°C, drop into the reactor with trichloroethylene and anhydrous hydrofluoric acid to make a primer, and the feeding speed of trichloroethylene is 100Kg / h, the feeding rate of anhydrous hydrofluoric acid is 4 Kg / h, until the trichlorethylene feeding amount reaches 300Kg and finishes at the bottom. Then feed continuously according to trichlorethylene:anhydrous hydrofluoric acid=60:24Kg / h, control the reaction liquid level at 50%, the reaction ...

Embodiment 2

[0021] On the basis of Example 1, the continuous feeding rate ratio of trichlorethylene and anhydrous hydrofluoric acid was changed to 60:16Kg / h, and the remaining reaction conditions were the same as in Example 1. The reaction results are shown in Table 1.

Embodiment 3

[0023] On the basis of Example 1, the continuous feeding rate ratio of trichlorethylene and anhydrous hydrofluoric acid was changed to 60:20Kg / h, and the remaining reaction conditions were the same as in Example 1. The reaction results are shown in Table 1.

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PUM

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Abstract

The invention discloses a method for preparing 1,1-difluoro-1,2-dichloroethane. The method uses trichloro ethylene and anhydrous hydrofluoric acid as raw materials, under action of a fluorination catalyst, to prepare 1,1-difluoro-1,2-dichloroethane by liquid phase catalysis and fluorination reaction. The method has advantages of mild reaction condition, simple method and easy implementation of industrialization production.

Description

Technical field [0001] The present invention is an organic fluorine chemical technology field, especially the preparation method involving a 1,1-diofluoro-1,2-dichloroethane. Background technique [0002] The 1,1-diofluoro-1,2-dichloroethane is commercially referred to as HCFC-132B or R132B, which is mainly used to prepare polymer monomers and intermediates used as Freon.Used to prepare polymer monitors, you can prepare 1,1-diofluoro-2-chlorohylene monomer for HCFC-132B under the action of alcoholine; as the intermediate of FlunPreparation of 1,1,2-mellachrose-2,2-diethane (R122) and 1,1,1,2-tetrachloride-2,2-diethane (R112A), while R122 and R112A are both.It is an important intermediate of Pesticide Pharmaceutical Flion. [0003] Regarding the preparation method of R132B, there are two preparation methods in patent documents.US4766259A Report in MNCL 2 / Alf 3 Or fecl 3 / Alf 3 Under the action of catalysts, the qi -solid -solid -hydromodiconic acid catalytic fluoride reactions ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/12C07C17/20C07C17/087
Inventor 王军祥刘建鹏姚富根舒忠杰周征一王华伟
Owner SINOCHEM LANTIAN