ChemicalBook CAS DataBase List Chlorotrifluoroethylene

Chlorotrifluoroethylene synthesis

14synthesis methods

Product Name:Chlorotrifluoroethylene
CAS Number:79-38-9
Molecular formula:C2ClF3
Molecular Weight:116.47

Chlorotrifluoroethylene is prepared from ethylene by the following route:

Ethylene is treated with an excess of chlorine at 300-350°C in the presence of activated charcoal to give hexachloroethane. This product is then treated with hydrogen fluoride in the presence of antimony pentachloride to yield trichlorotrifluoroethane. Dechlorination in the liquid phase with zinc dust and ethanol results in the formation of chlorotrifluoroethylene which is washed with water to remove alcohol, dried and distilled under pressure.

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79-38-9
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Yield:79-38-9 99.22%

Reaction Conditions:

with potassium zinc trihydride at 250 - 320; under 7500.75 Torr; for 5 h;Inert atmosphere;Large scale;Temperature;Pressure;

Steps:

3

Packed in 60/40X6000 nickel alloy tube reactor21.4 potassium zinc trihydride ,The catalyst loading volume is 30L.The tube reactor jacket is heated by heat transfer oil,The reactor was heated to 250 ° C,The catalyst was further dried by passing N2 at a rate of 10 L / min,After 5 hours, then raise to 320 ° C.1,1,2-Trifluoro-1,2,2-trichloroethane is preheated from the top of the column reactor,Feeding rate for the standard state 90L / min,The pressure of the column reactor is kept at 1.0Mpa, the reaction material is removed from the bottom of the column reactor, washed directly through the caustic soda, dried by molecular sieves,Distillation collection and sampling analysis,After 1 hour, 27.90 kg purity of 99.9% chlorotrifluoroethylene was collected. The conversion of 1,1,2-trifluoro-1,2,2-trichloroethane was 99.5% and the yield was 99.22%.

References:

CN104140356,2016,B Location in patent:Paragraph 0022; 0023