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Method for preparing pentafluoroethane

A technology of pentafluoroethane and dichloroethane, which is applied in the field of preparation of pentafluoroethane, can solve problems such as difficult separation, reduced yield, and harmfulness, and achieve the effect of improving product purity

Active Publication Date: 2011-07-13
JIANGSU BLUESTAR GREEN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chloropentafluoroethane (CF 3 CCIF 2 or CFC-115) is harmful because it reduces yield and is difficult to separate from pentafluoroethane by distillation

Method used

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  • Method for preparing pentafluoroethane

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preparation example Construction

[0020] The invention discloses a preparation method of pentafluoroethane, using 1,1,1-trifluoro-2,2-dichloroethane or 1,1,1-trifluoro-2,2-dichloroethane The composition of its structural isomer reacts with potassium fluoride aqueous solution at a temperature of 280-330°C and a pressure of 12-13MPa to produce pentafluoroethane. The reaction equation is as follows:

[0021]

Embodiment 1

[0024] With a high-pressure metering pump, 27% potassium fluoride aqueous solution is driven into the coil type preheater with a speed of 1600Kg / h, and with another high-pressure metering pump, the mass percent content is 99.8% at a speed of 300Kg / h. The composition of 1,1,1-trifluoro-2,2-dichloroethane and its structural isomers is injected into another coil-type preheater, and the temperature of the preheater is between 180°C and 200°C.

[0025] After the potassium fluoride aqueous solution is preheated, it enters the coil superheater at a temperature of 310°C to 320°C. The overheated potassium fluoride aqueous solution and the preheated 1,1,1-trifluoro-2,2- The composition of dichloroethane and its structural isomers enters the bottom of a pipe reactor with a diameter of 27cm and a length of 26m for mixed reaction, the reaction temperature is 310°C-320°C, and the reaction pressure is 12MPa-13MPa.

[0026]After the potassium fluoride aqueous solution is mixed with the compos...

Embodiment 2

[0028] With a high-pressure metering pump, 28% potassium fluoride aqueous solution is driven into the coil type preheater with a speed of 830Kg / h; with another high-pressure metering pump, the mass percentage content is 99.8% The composition of 1,1,1-trifluoro-2,2-dichloroethane and its structural isomers is injected into another coil-type preheater, and the temperature of the preheater is between 180°C and 200°C.

[0029] After the potassium fluoride aqueous solution is preheated, it enters the coil superheater at a temperature of 320°C to 330°C. The overheated potassium fluoride aqueous solution and the preheated 1,1,1-trifluoro-2,2- The composition of dichloroethane and its structural isomer enters into the bottom of a pipeline reactor with a diameter of 27cm and a length of 26m for mixed reaction, the reaction temperature is 320°C-330°C, and the reaction pressure is 12MPa-13MPa.

[0030] After the potassium fluoride aqueous solution is mixed with the composition of 1,1,1-t...

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Abstract

The invention provides a method for preparing pentafluoroethane, wherein a raw material I reacts with a raw material II to prepare pentafluoroethane; the raw material I is 1,1,1-trifluoro-2,2-dichloroethane or the composite of 1,1,1-trifluoro-2,2-dichloroethane and a constitutional isomer thereof; and the mass percentage of the raw material II is more than 99.8% and the raw material II is 20-30wt% potassium fluoride solution. The invention also discloses the specific preparation method. By adopting the method, the by-product chloropentafluoroethane can not be generated in the whole reaction process, no harmful substances can be discharged and all the raw materials can be recycled; and the problem of how to convert the reaction raw materials to pentafluoroethane and realize high selectivity and high conversion rate, can be solved and the product purity can be increased.

Description

Technical field: [0001] The invention relates to a method for preparing pentafluoroethane. Background technique: [0002] Pentafluoroethane, the trade name is HFC-125, the compound pentafluoroethane (CF 3 CHF 2 or HFC-125) is a useful blowing agent, propellant, refrigerant, fire extinguishing agent, or germicidal carrier gas, which has an ideal zero ODP value. [0003] With the further implementation of the "Montreal Protocol on Substances that Deplete the Ozone Layer" and "China's National Plan for Phasing Out Ozone Depleting Substances", relevant companies in various countries are speeding up the pace of developing alternatives to ozone depleting substances (ODS). At present, research on alternatives to perfluorochlorocarbon (CFCS) refrigerants can be divided into three stages: the first generation of alternatives is mainly based on the series of hydrochlorofluorocarbons (HCFCs). The potential (ODP) value has been greatly reduced; the second generation is a single worki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/08C07C17/35
Inventor 陈建海张伟华吴建军李建明
Owner JIANGSU BLUESTAR GREEN TECH
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