Patent ID: 7880024

Claim:
An ionic liquid comprising at least one of the compounds represented by Formula 1 below: (Cat + )(R′COO − ) (Formula 1) wherein Cat + is a cation selected from the group consisting of quaternary ammonium, quaternary phosphonium, sulfonium, imidazolium, pyridinium, pyrazolium, piperidinium, pyrrolium, pyrrolidinium, triazolium, and a mixture of two or more thereof, and R′ is a hydrocarbon comprising at least one unsaturated bond, and having 4 to 30 carbon atoms such that R′COO − is an anion selected from the group consisting of crotonate group, undecylenate group, myristoleate group, palmitoleate group, oleate group, eicosapentaenoate group, erucate group, arachidonate group, docosahexaenoate group, and mixtures thereof, wherein when the R′COO − is oleate and Cat + is quaternary ammonium, Cat + is hexyl tributyl ammonium.