Preparation of 1,1,1,-trifluoroethane by Catalytic Fluorination of 1,1,1,-trichloroethane and 1-fluoro-1,1-dichloroethane

Honggon Kim; Hoon Sik Kim; Byung Gwon Lee; Young Soo Kwon; Kun You Park

Journal of Industrial and Engineering Chemistry, Vol.3, No.3, 203-209, September, 1997

Honggon Kim, Hoon Sik Kim, Byung Gwon Lee , Young Soo Kwon, and Kun You Park

Division of Environment & CFC Technology, Korea Institute of Science and Technology, Seoul 136-791, Korea

Preparation of 1,1,1-trifluoroethane by catalytic gas phase fluorination of 1,1,1-trichloroethane and 1-fluoro-1,1-dichloroethane was studied. Mixtures of chromium fluoride and magnesium fluoride were found to be active fluorinating catalysts for preparing 1,1,1-trifluoroethane. Molar ratio of chromiunl to magnesium in the active catalysts was determined to be in the range of 0.2/ to 4/1. Optimal conditions of reaction temperature, contact time and feed composition as well as the extent of the catalyst temperature increase by the exothermic reactions were also studied. Two stage fluorination reaction was proposed for producing a high yield of 1,1,1-trifluoroethane and for lengthening the catalyst lifetime : 1,1,1-trichloroethane to 1-fluoro-1,1-dichloroethane at a low temperature first and 1-fluoro-1,1-dichloroethane to 1,1,1-trifluoroethane at a high temperature later.

[References]

Rowland FS, Molina MJ, Rev. Geophys. Space Phys., 13, 1 (1975)
U.S. Patent, 4,258,225 (1981)
U.S. Patent, 3,755,477 (1973)
U.S. Patent, 2,894,044 (1959)
European Patent, 187643 (1986)
Japan Patent, 51-39606 (1976)
Japan Patent, 51-29404 (1976)
Japan Patent, 47-39086 (1972)
Japan Patent, 91-293740 (1991)
European Patent, 402626 (1990)
U.S. Patent, 3,833,676 (1974)
U.S. Patent, 5,434,320 (1995)
Kim H, Kim HS, Lee BG, Lee H, Kim SH, J. Chem. Soc.-Chem. Commun., 2383 (1995)
Lee BG, Kim HS, Kim H, Lee SD, Seo I, J. Ind. Eng. Chem., 3(2), 160 (1997)
Riddick JA, Bunger WB, Sakano TK, "Organic Solvents," 4th ed., John Wiley & Sons, New York (1976)
Reid RC, Prausnitz JM, Poling BE, "The Properties of Gases and Liquids," 4th ed., McGraw-Hill, New York (1986)

[Referenced By]

[Related Articles]

[1] Rowland FS, Molina MJ, Rev. Geophys. Space Phys., 13, 1 (1975)

[2] U.S. Patent, 4,258,225 (1981)

[3] U.S. Patent, 3,755,477 (1973)

[4] U.S. Patent, 2,894,044 (1959)

[5] European Patent, 187643 (1986)

[6] Japan Patent, 51-39606 (1976)

[7] Japan Patent, 51-29404 (1976)

[8] Japan Patent, 47-39086 (1972)

[9] Japan Patent, 91-293740 (1991)

[10] European Patent, 402626 (1990)

[11] U.S. Patent, 3,833,676 (1974)

[12] U.S. Patent, 5,434,320 (1995)

[13] Kim H, Kim HS, Lee BG, Lee H, Kim SH, J. Chem. Soc.-Chem. Commun., 2383 (1995)

[14] Lee BG, Kim HS, Kim H, Lee SD, Seo I, J. Ind. Eng. Chem., 3(2), 160 (1997)

[15] Riddick JA, Bunger WB, Sakano TK, "Organic Solvents," 4th ed., John Wiley & Sons, New York (1976)

[16] Reid RC, Prausnitz JM, Poling BE, "The Properties of Gases and Liquids," 4th ed., McGraw-Hill, New York (1986)