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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 costs, complicated recycling process, and large equipment investment, and achieves improved utilization rate, simple process, and low equipment investment. little effect

Inactive Publication Date: 2006-03-22
苏州联氟化学有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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] Embodiment 1: see attached figure 1 As shown, first put 200g SnCl 4 Catalyst and 300g anhydrous HF are pressed in the 1000ml steel first reactor 5 that has reflux tower 6, and be warmed up to 55 ℃; Put 20g SbCl 5 Catalyst and 400g of R142b primer are pressed into the 1000ml steel second reactor 7 with reflux tower 8, and the temperature is raised to 50°C. Then, begin to anhydrous hydrogen fluoride with the speed of 56g / h, vinylidene chloride is sent to react in the first reactor 5 with the speed of 97g / h, after the pressure in the first reactor 5 reaches 1.2Mpa, from The top of the reflux tower of the first reactor 5 introduces the reaction materials into the second reactor 7 for further reaction. After the pressure of the second reactor 7 reached 1.0Mpa, the reaction product was drawn from the top of the reflux tower of the second reactor 7, and the reaction product was collected in the gas cabinet 11 after washing with water in the washing tower 9 and alkali washing...

Embodiment 2-4

[0026]

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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 present 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), and is currently widely used as a refrigerant. 1,1,1-Difluorochloroethane is referred to as HCFC-142b (or R142b), 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 etc. as catalysts, the preparation of R143a and R142b by liquid-phase fluorination is a known method, and the reaction process can be represented by the following reaction formula: [0004] <chemistry num="001"> <chem fi...

Claims

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Application Information

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