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Synthesis and Mechanism of CF3 I


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Synthesis and Mechanism of CF3 I
LI Qin-hua1TAN Ling-hua12HANG Zu-sheng12MAO Ai-qin1PAN Ren-ming1
1. School of Chemical Engineering,NUST,Nanjing 210094,China;2. Department of Material Engineering,Nanjing Institute of Technology,Nanjing 211167,China
trifluoroiodomethane synthesis mechanism difluorocarbene
O643. 36; TQ426. 94
Trifluoroiodomethane( CF3 I) is synthesized via the vapor-phase catalytic method using trifluoromethane(CHF3) and iodine ( I2) . The product is characterized by gas chromatography-massspectrometry,gas chromatography,Fourier transform infrared spectroscopy and molecular weight determination.The catalyst is investigated with the BET( Brunauer,Emmett and Teller) specific surfacearea method and thermogravimetry. The results show that the conversion of CHF3 is 52. 3% and theselectivity of CF3 I is 56. 2%. The BET surface area and the pore volume of catalyst are 776. 8 m2 /gand 0. 38 cm3 /g before the reaction and decrease to 359. 2 m2 /g and 0. 18 cm3 /g after the reaction.The weight loss of the used catalyst reaches 12wt% over the temperature range of 250 ~ 350 ℃,which shows that coke forms in the process of reaction. The possible mechanism of the product andby-products is proposed based on the difluorocarbene( CF2) disproportionate and coke formation.


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Last Update: 2012-10-25