Method for preparing pentafluoroethane

A technology of pentafluoroethane and chloroethane, 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: 2011-05-25
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

Examples

Experimental program
Comparison scheme
Effect test

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 840Kg / h, and with another high-pressure metering pump, the mass percentage content is 99.8% with a speed of 300Kg / h. The composition of 1,1,1,2-tetrafluoro-2-chloroethane 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 1,1,1,2-tetrafluoro-2- The composition of ethyl chloride 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...

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 460Kg / h; with another high-pressure metering pump, the mass percentage content is 99.8% The composition of 1,1,1,2-tetrafluoro-2-chloroethane 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 1,1,1,2-tetrafluoro-2- The composition of ethyl chloride 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.

[0030] After the potassium fluoride aqueous solution is mixed with the composition of 1,1,1,2-tetraf...

Embodiment 3

[0032] With a high-pressure metering pump, 30% potassium fluoride aqueous solution is driven into the coil type preheater with a speed of 590Kg / h; with another high-pressure metering pump, the mass percentage content is 99.8% The composition of 1,1,1,2-tetrafluoro-2-chloroethane and its structural isomers is injected into another coil-type preheater, and the temperature of the preheater is between 180°C and 200°C.

[0033] 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 1,1,1,2-tetrafluoro-2- The composition of ethyl chloride 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.

[0034] After the potassium fluoride aqueous solution is mixed with the composition of 1,1,1,2-tetra...

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Abstract

The invention provides a method for preparing pentafluoroethane. The pentafluoroethane is prepared by reacting a raw material I and a raw material II, wherein the raw material I is 1, 1, 1, 2-tetrafluoro-2-chloroethane or a composition of the 1, 1, 1, 2-tetrafluoro-2-chloroethane and a structural isomer thereof, and the mass percentage of the raw material I is more than 99.8 percent; and the raw material II is 20 to 30 mass percent aqueous solution of potassium fluoride. The invention also discloses a specific preparation method. By the method, chlorinated pentafluoroethane serving as a by-product does not occur, and noxious substances are not discharged in the integral reaction process, and the used raw materials can be recycled. Simultaneously, the problem of converting the reaction rawmaterials into the pentafluoroethane with high selectivity and high conversion rate is solved, and the purity of the product is improved.

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 perfluorochlorocarbons (CFCs) refrigerants can be divided into three stages: the first-generation alternatives are mainly hydrofluorochlorocarbons (HCFCs) series, and these substances are relatively ozone-depleting compared to CFCs. The potential (ODP) value has been gre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/08C07C17/20
Inventor 陈建海张伟华吴建军李建明
Owner JIANGSU BLUESTAR GREEN TECH
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