A cryogenic system for recovering a gas product stream and a liquid product stream from a hydrocarbon gas stream which operates at process temperature of minus 50 F and lower. A portion of the refrigerating liquid stream produced during operation of the cryogenic system is heat-exchanged with the inlet vapor stream and together define a partially closed refrigeration loop. The partially closed refrigeration loop permits the low process temperatures to be achieved. Both the cold separator vapor stream and the stabilizer overhead vapor stream are heat exchanged with the inlet vapor stream. This process reduces operational cost and personnel by minimizing the compression horse power requirements.