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Production of 1,1,1,2-tetrafluoroethykane and pentafuoethane simultaneously

A technology for pentafluoroethane and tetrafluoroethane, applied in the field of preparing fluorine-containing alkanes, can solve the problems such as no disclosure of R123 manufacturing method, inability to simultaneously prepare R134a and R125, and inability to simultaneously prepare R134A and R125, etc. Equipment cost and energy consumption cost, the effect of reducing the types of raw materials

Inactive Publication Date: 2007-09-19
浙江莹光化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, R125 is made of tetrachloroethylene (PCE, hereinafter referred to as PCE) and HF as raw materials, and is obtained through a two-step reaction, separation and circulation. Fluorinated with HF, Cr 2 o 3 A method for preparing R125 as a catalyst, in which the R125 content in the crude gas is only 10.7%, and R134a and R125 cannot be produced at the same time
[0005] Japanese Patent Laid-Open No. 7-324044 discloses a method of using PCE and HF as raw materials to produce R125 through two reactors and two separation towers. In this method, the crude gas R125 content is 19.4%, and this method cannot Simultaneous production of R134a and R125
[0006] Chinese patent CN1268501A discloses a method for simultaneously preparing R124 and R125 by using R123 and HF as raw materials. In this method, the reaction temperature is 280°C, the content of R125 is 55.08%, and the content of R124 is 16.82%. R134A and R125, and the manufacturing method of R123 is not disclosed in this patent

Method used

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  • Production of 1,1,1,2-tetrafluoroethykane and pentafuoethane simultaneously
  • Production of 1,1,1,2-tetrafluoroethykane and pentafuoethane simultaneously

Examples

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Embodiment 1

[0023] The first step reaction and the second step reaction are respectively reacted in two reactors, and the production process of simultaneously manufacturing R134a and R125 is:

[0024] 1. Preparation of Catalyst No. 1. Add 732.5g (500ml) TCE, 50g reduced iron powder in a 1 liter four-neck flask, install booster stirrer, reflux condenser, pass Cl 2 tube and temperature measuring tube, turn on the stirrer, cool the reflux condenser with water, heat the four-necked flask with a water bath, control the temperature in the flask to 70°C, and then pass Cl 2 Reaction, reflux condenser top unreacted Cl 2 Guide to absorb in 10% sodium hydroxide solution, pass through Cl 2 The speed is about 0.5 liters / minute, until all the reduced iron powder reacts, that is, an anhydrous iron trichloride halogenated hydrocarbon solution is obtained, wherein the solution contains FeCl 3 15.30%, this solution is No. 1 catalyst.

[0025] 2. Preparation of Catalyst No. 2. Add 32.6g of No. 1 cataly...

Embodiment 2

[0029] The first step reaction and the second step reaction are completed in the same reactor, and the production process for simultaneously manufacturing R134a and R125 is:

[0030] 1. Preparation of Catalyst No. 1. The preparation of No. 1 catalyst is the same as in Example 1.

[0031] 2. Preparation of Catalyst No. 2. The preparation of No. 2 catalyst is the same as in Example 1.

[0032] 3. Preparation of Catalyst No. 3. The preparation of No. 3 catalyst is the same as in Example 1.

[0033] 4. Arrange equipment according to the technological process of accompanying drawing 2, wherein, the first step reaction and the second step reaction all react in reactor 2, add No. 1 catalyst 0.3 liters in reactor 2, No. 2 catalyst 1.4 liters; TCE Feeding rate is 700g / h, Cl 2 The molar ratio of TCE to TCE is 1.5; the molar ratio of HF to TCE in reactor 2 is 3.3; the molar ratio of HF to organic matter in reactor 3 is 9. Others are identical with embodiment 4. After the reaction ...

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Abstract

Production of 1,1,1,2-tetrafluoroethane and pentafluoethane simultaneously is carried out by taking chlorylene as raw material, reacting with Cl2 with anhydrous ferric chloride as catalyst to generate pentaline partly, reacting with HF with mixture of antimony chloride and anhydrous ferric chloride as catalyst to generate mixture of 1,1,1-trifluoride-2-chloroethane and 1,1,1,2-tetrafluoride-2-hydrochloric ether, reacting with HF at 200~400DEG C and 0~0.5Mpa with mixture of CrF3, AlF3, ZnF2 and MgF2 as catalyst to generate mixture of 1,1,1,2-tetrafluoroethane and pentafluoethane, separating, washing, alkali washing, dewatering, rectifying and drying to obtain 1,1,1,2-tetrafluoroethane and pentafluoethane.

Description

technical field [0001] The invention relates to a method for preparing fluorine-containing alkanes, in particular to a method for simultaneously preparing 1,1,1,2-tetrafluoroethane and pentafluoroethane. Background technique [0002] Due to the traditional widely used CF 2 Cl 2 、CHF 2 Refrigerants such as Cl and R502 are chlorine-containing halogenated alkanes, which will destroy the ozone layer above the earth, so they are restricted or banned by a series of international treaties. The substitutes for chlorine-containing halogenated hydrocarbon refrigerants are some chlorine-free fluoroalkanes, such as difluoromethane (R32), 1,1,1,2-tetrafluoroethane (R134a, hereinafter referred to as R134a), pentafluoroethane (R125, hereinafter referred to as R125), etc., especially R134a and R125, are often used as components of mixed refrigerants at the same time. [0003] At present, R134a is obtained by using trichlorethylene (TCE, hereinafter referred to as TCE) and anhydrous hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/00C07C17/04C07C17/07C07C17/10C07C19/08
Inventor 徐金和陈志军张巍彪舒军宾马国平陈宏跃刘前单舜尧朱立锦陈飞燕康云晓
Owner 浙江莹光化工有限公司
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