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97117669/04, 1997-10-23

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Start date

1997-10-23

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1997-10-23

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1999-07-10

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Inventor

Malyshev S.V.Shatalov V.V.Orekhov V.T.Ponomarev L.A.Zuev V.A.Denisov A.K.Dedov A.S.Tsarev V.A.Golubev A.N.Korotkevich V.M.Saltan N.P.

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Holder

Vserossijskij Nauchno-Issledovatel'Skij Institut Khimicheskoj TekhnologiiSibirskij Khimicheskij KombinatAo Kirovo-Chepetskij Khimicheskij Kombinat

METHOD OF PREPARING 1,1,1,2-TETRAFLUOROETHANE (COOLANT- 134a) Russian patent published in 1999 - IPC

Abstract RU 2132839 C1

FIELD: chemical industry, more particularly preparation of ozone-safe coolants. SUBSTANCE: 1,1,1,2- tetrafluoroethane is prepared by fluorination of 1,1,1- trifluoroethane with variable valent metal fluoride in the presence of diluent. Diluent is unreacted 1,1,1- trifluoroethane, penta-or hexafluoroethane. Metal fluoride is uranium hexafluoride or cobalt trifluoride, 1,1,1-trifluoroethanol to uranium hexafluoride molar ratio is 1.0-3.0:1 and fluorination temperature is 380- 500 C. When cobalt fluoride is used, process temperature is 250-350 C, and load is 8-24 l/h of 1,1,1- trifluoroethane per 1 kg of solid fluorinating agent. EFFECT: increased yield of the final product and lower power consumption of the process. 3 cl, 8 ex

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RU 2 132 839 C1

Authors

Malyshev S.V.

Shatalov V.V.

Orekhov V.T.

Ponomarev L.A.

Zuev V.A.

Denisov A.K.

Dedov A.S.

Tsarev V.A.

Golubev A.N.

Korotkevich V.M.

Saltan N.P.

Dates

1999-07-10—Published

1997-10-23—Filed

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