Patent ID: 8779220

Claim:
A method for capturing a fluorinated vinyl monomer from a gaseous mixture comprising the steps of: a) providing a gaseous mixture comprising at least one fluorinated vinyl monomer selected from the group consisting of C 2 H 3 F, C 2 H 2 F 2 , C 2 HF 3 , C 3 HF 5 , C 3 H 2 F 4 , C 3 H 3 F 3 , C 3 H 4 F 2 , and C 3 H 5 F; and b) contacting the gaseous mixture with at least one ionic liquid, whereby at least a portion of the fluorinated vinyl monomer is absorbed by the ionic liquid; wherein said ionic liquid comprises a cation and an anion selected from one or more members of the group consisting of tetrafluoroethanesulfonate, [SbF 6 ] − , [CF 3 SO 2 ] − , [HCF 2 CF 2 SO 3 ] − , [CF 3 HFCCF 2 SO 3 ] − , [HCClFCF 2 SO 3 ] − , [(CF 3 SO 2 ) 2 N] − , [(CF 3 CF 2 SO 2 ) 2 N] − , [(CF 3 SO 2 ) 3 Cl] − , [CF 3 CO 2 ] − , [CF 3 OCFHCF 2 SO 3 ] − , [CF 3 CF 2 OCFHCF 2 SO 3 ] − , [CF 3 CFHOCF 2 CF 2 SO 3 ] − , [CF 2 HCF 2 OCF 2 CF 2 SO 3 ] − , [CF 2 ICF 2 OCF 2 CF 2 SO 3 ] − , [CF 3 CF 2 OCF 2 CF 2 SO 3 ] − , [(CF 2 HCF 2 SO 2 ) 2 N] − , [(CF 3 CFHCF 2 SO 2 ) 2 N] − , F − , and anions represented by the structure of the following formula: wherein R 11 is selected from the group consisting of: (i) —CH 3 , —C 2 H 5 , or C 3 to C 17 straight-chain, branched or cyclic alkane or alkene group substituted with F; (ii) —CH 3 , —C 2 H 5 , or C 3 to C 17 straight-chain, branched or cyclic alkane or alkene group comprising one to three heteroatoms selected from the group consisting of O, N, Si and S, and substituted with F; and (iii) a C 6 to C 10 substituted aryl, or a C 6 to C 17 substituted heteroaryl group having one to three heteroatoms independently selected from the group consisting of O, N, Si and S; and substituted with —CH 3 , —C 2 H 5 , or a C 3 to C 17 straight-chain, branched or cyclic alkane or alkene group substituted with F.