NOVELTY - Processing gas stream involves cooling and expanding feed gas (1) to temperature and pressure to condense portion of feed gas into greater than 2C enriched liquid phase and greater than 2C depleted vapor phase; separating vapor phase (5) from liquid phase (4) in high-pressure separator (54) and combining vapor phase with portion of deethanizer overhead product; expanding liquid phase to provide cooling for at least one of feed gas and the deethanizer overhead product; and feeding expanded liquid phase to deethanizer to form deethanizer overhead product and greater than 3C bottom product.    USE - For processing a gas stream (claimed), particularly natural gas processing for propane recovery.    ADVANTAGE - The method is improved and economical. The high pressure feed gas (e.g. greater than or equal to 1000 psig) is processed in configurations and method employs feed gas chilling and expansion of the chilled feed gas to reduce the temperature to a degree sufficient for condensation of a portion of the feed gas into greater than 2C enriched liquid phase and greater than 2C depleted vapor phase. A downstream high-pressure separator separates the vapor phase from the liquid phase and the vapor phase is combined with the residue gas while the liquid phase is further expanded to provide extra cooling to the feed gas and/or reflux prior to being fed to the deethanizer.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a gas processing plant comprising a first heat exchanger and a first expansion device fiuidly coupled to each other and configured to cool and expand a high-pressure feed gas to a temperature and pressure to condense a portion of the feed gas into greater than 2C enriched liquid phase and a greater than 2C depleted vapor phase; a high-pressure separator fiuidly coupled to the first expansion device and configured to separate the cooled and expanded feed gas into the vapor phase and the liquid phase; a connection that is configured to fiuidly couple the separator to a conduit that carries a portion of a deethanizer overhead product, and where the fluid connection is configured to allow combination of the vapor phase with the portion of the deethanizer overhead product; a second expansion device that is configured to receive and expand the liquid phase and to provide the expanded liquid phase to at least one of the first heat exchanger and a second heat exchanger; where the at least one of the first heat exchanger and the second heat exchanger are configured to provide cooling for at least one of the feed gas and the deethanizer overhead product; and a deethanizer that is configured to receive the expanded liquid phase and to produce the deethanizer overhead product and greater than 3C bottom product.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic diagram of one exemplary propane recovery configuration.    dry feed gas stream (1)    forming stream (2)    high-pressure separator vapor stream (22)    deethanizer reflux separator vapor stream (21)    high-pressure separator liquid letdown stream (23)    vapor stream (5)    liquid stream (4)    Joule-Thomson valve (53)    deethanizer overhead stream (8)    deethanizer condenser (60)    air cooler. (60)