C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/657.2
C07C 21/18 (2006.01) C07C 17/361 (2006.01) C07D 339/00 (2006.01)
Patent
CA 1164016
ABSTRACT LIQUID PHASE SYNTHESIS OF HEXAFLUOROISOBUTYLENE The process for preparing hexafluoroisobuty- lene is disclosed which comprises reacting, in the liquid phase, formaldehyde or a formaldehyde-generating compound with hexafluorothioacetone dimer in an aprotic solvent containing at least a catalytic amount of an alkali metal fluoride or a sulfonic acid having general formula RSO3H is disclosed. The preferred aprotic sol- vents are dimethylformamide, N-methyl pyrrolidone and dimethyl sulfoxide. The preferred alkali metal fluoride is KF; the preferred sulfonic acids are CH3SO3H and p-CH3C6H4SO3H. The production of hexafluoroisobutylene by contacting hexafluoropropene with elemental sulfur and a catalytic amount of an alkali metal fluoride such as KF in an aprotic solvent such as dimethyl sulfoxide or N-methyl pyrrolidone at a temperature of between about 40° and about 70°C for a time sufficient to produce hexa- fluorothioacetone dimer combined with contacting said dimer in said aprotic solvent containing said alkali metal fluoride at a temperature between about 100°C and 150°C for a time sufficient to produce an effluent stream containing hexafluoroisobutylene which is recovered therefrom is also disclosed.
400161
Allied Corporation
Gowling Lafleur Henderson Llp
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