a system for processing a product with a solvent containing volatile constituents , the system including a pressure chamber for receiving the product , a vacuum pump for evacuating the chamber , a solvent recirculating system for admitting the solvent at a predetermined pressure into the chamber , the solvent recirculating system including a heater for maintaining the temperature of the chamber at the saturation temperature of the solvent , gas liquid separator for separating the gas and liquid components of the solvent discharged from the chamber , a first closed loop system connected to the separator to return the gas constituent to the chamber and a second closed loop system connected to the separator to return the liquid component to the chamber .