We present a continuous flow method for converting limonene oxide and limonene dioxide to limonene carbonates using carbon dioxide in its supercritical state as reagent and sole solvent. Various ammonium-based ionic liquids were initially investigated in batch mode. For applying the best performing and selective catalyst tetrabutylammonium chloride in continuous flow, the ionic liquid was physisorbed on mesoporous silica as SILP catalyst. After optimization in short-term experiments, the long-term stability of the SILP system was studied for 48 h.