Patent ID: 8764885

Claim:
A system for separating condensable vapors from light gases by desublimating the condensable vapors, comprising: a heat exchanger configured to precool a condensable-vapor-containing process stream; a direct contact heat exchanger (DCHE) vessel downstream from the heat exchanger, the DCHE vessel including a non-volatile heat exchange liquid (NVHEL) within a vessel, the vessel having a process stream inlet, a light gas outlet, and a desublimated solids outlet, the process stream inlet configured to cause a precooled condensable-vapor-containing process stream received from the heat exchanger to directly contact the NVHEL within the DCHE vessel, wherein the system is configured to cool the NVHEL to a temperature and pressure such that direct contact of the NVHEL with the process stream causes the condensable vapors to desublimate and form separated cool gases and a slurry comprising desublimated solids and the NVHEL, the separated light-gas stream exiting the DCHE vessel through the light gas outlet, the desublimated solids exiting the DCHE vessel through the desublimated solids outlet; and a solids separator that separates at least a portion of the desublimated solids from the NVHEL.