Process for carrying out a chemical reaction with ionic liquid and carbon dioxide under pressure

The invention is directed to a process for carrying out a chemical reaction in an ionic liquid as solvent and CO2 as cosolvent, in which process reactants are reacted in a homogeneous phase at selected pressure and temperature to generate a reaction product at least containing an end-product of the reaction, and upon completion of the reaction a multiphase system is obtained by change of conditions, wherein at least one of the phases is the ionic liquid and at least one other phase is a carbon dioxide phase at least containing the end-product, which carbon dioxide phase is substantially free of ionic liquid, separating the carbon and recovering the end-product