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Process for preparing 1, 1, 1-trifluoroethane and 1, 1, 1-difluorochloroethane

A technology of difluorochloroethane and trifluoroethane, which is applied in the field of preparation of halogenated hydrocarbons, can solve the problems of rising production cost, large equipment investment, complicated recovery process, etc. concise effect

Inactive Publication Date: 2005-01-26
苏州联氟化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, when the product contains more R142b, since R142b and HF can form an azeotrope, it is inevitable that part of the unreacted HF will be taken out of the reactor, resulting in a decrease in the utilization rate of HF and a reduction in production costs. rise
[0009] People have adopted a variety of methods to recycle unreacted anhydrous hydrogen fluoride to improve the utilization rate. For example, U.S. Patent 2,894,044 discloses the method of azeotropic distillation to reclaim anhydrous hydrogen fluoride in R142b. This method is not only difficult to operate, but also The recovery effect is also unsatisfactory; U.S. Patent 4209470 discloses a method for recovering HF by combining freezing stratification and azeotropic distillation. rising production costs

Method used

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  • Process for preparing 1, 1, 1-trifluoroethane and 1, 1, 1-difluorochloroethane
  • Process for preparing 1, 1, 1-trifluoroethane and 1, 1, 1-difluorochloroethane
  • Process for preparing 1, 1, 1-trifluoroethane and 1, 1, 1-difluorochloroethane

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Embodiment 1

[0024] Example 1: see attached figure 1 shown, first put 200g SnCl 4 The catalyst and 300g of anhydrous HF were pressed into the 1000ml steel first reactor 5 with a reflux tower 6, and the temperature was raised to 55°C; 20g of SbCl 5 The catalyst and 400 g of R142b primer were pressed into a 1000 ml steel second reaction kettle 7 with a reflux tower 8, and the temperature was raised to 50°C. Then, start to pump anhydrous hydrogen fluoride at a speed of 56g / h and vinylidene chloride at a speed of 97g / h to react in the first reactor 5, when the pressure in the first reactor 5 reaches 1.2Mpa, from The reflux tower top of the first reactor 5 introduces the reaction material into the second reactor 7 for further reaction. When the pressure of the second reaction kettle 7 reaches 1.0Mpa, the reaction product starts to be drawn from the reflux tower top of the second reaction kettle 7, and the reaction product is collected in the gas cabinet 11 after the water washing tower 9 and ...

Embodiment 2-4

[0026]

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PUM

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Abstract

The invention discloses a process for preparing 1,1,1-trifluoroethane and 1,1,1-difluorochloroethane by using vinyl chloride and waterless hydrogen fluoride as the raw material, characterized in that, two liquid phase fluorine reaction kettles are employed for tandem reaction, the first reaction kettle uses one or two of SnCl4, TiCl4 as catalyst, while the second reaction kettle uses one or more from SbCl5, TaCl5, TaF5, NbCl5 as catalyst, which make the HF react completely.

Description

technical field [0001] The invention relates to a method for preparing halogenated hydrocarbons, in particular to a method for preparing 1,1,1-trifluoroethane and 1,1,1-difluorochloroethane by using vinylidene chloride and anhydrous hydrogen fluoride as raw materials method. Background technique [0002] 1,1,1-trifluoroethane is referred to as HFC-143a (or R143a), which is widely used as a refrigerant at present, and 1,1,1-difluorochloroethane is referred to as HCFC-142b (or R142b), which is used as a refrigerant Raw materials for refrigerants, foaming agents, cleaning agents and polymers are widely produced and used. [0003] Using vinylidene chloride and anhydrous hydrogen fluoride as raw materials, using SnCl 4 , TiCl 4 , SbCl 5 As a catalyst, the preparation of R143a and R142b by the liquid phase fluorination method is a method that has been known for a long time, and the reaction process can be represented by the following reaction formula...

Claims

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Application Information

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IPC IPC(8): C07C17/087C07C19/08C07C19/10
Inventor 尤来方
Owner 苏州联氟化学有限公司
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