Natural gas separation with refrigerant purification

Claim 1

A GASOLINE ABSORPTION PROCESS COMPRISING: INTRODUCING A NATURAL GAS STREAM TO AN ABSORPTION ZONE; INTRODUCING LEAN OIL TO SAID ABSORPTION ZONE; COUNTERCURRENTLY CONTACTING SAID STREAM WITH SAID OIL IN SAID ABSORPTION ZONE TO EFFECT ABSORPTION OF THE HYDROCARBON COMPONENTS IN SAID STREAM BY SAID OIL; PASSING THE RESULTING RICH OIL FROM SAID ABSORPTION ZONE TO A DEETHANIZING ZONE FOR REMOVING ETHANE AND LIGHTER MATERIALS; PASSING THE DEETHANIZED RICH OIL TO A STRIPPING ZONE FOR REMOVAL OF THE ABSORBED HYDROCARBONS FROM THE OIL; WITHDRAWING THE RESULTING LEAN OIL FROM SAID STRIPPING ZONE; WITHDRAWING THE RESULTING VAPORIZED HYDROCARBONS FROM SAID STRIPPING ZONE AND CONDENSING SAME; PASSING THE CONDENSED HYDROCARBONS TO A DEPROPANIZING ZONE FOR REMOVING PROPANE AND LIGHTER MATERIALS; WITHDRAWING THE RESULTING DEPROPANIZED HYDROCARBONS FROM SAID DEPROPANIZING ZONE AS THE GASOLINE FRACTION PRODUCT; WITHDRAWING THE RESULTING VAPORIZED HYDROCARBONS FROM SAID DEPROPANIZING ZONE AND CONDENSING SAME AS AN IMPURE PROPANE PRODUCT; PASSING A PORTION OF SAID CONDENSED IMPURE PROPANE PRODUCT TO A REFRIGERATION SYSTEM; PASSING SAID NATURAL GAS STREAM AND SAID LEAN OIL PRIOR TO SAID INTRODUCING STEPS IN INDIRECT HEAT EXCHANGE RELATIONSHIP WITH SAID IMPURE PROPANE TO COOL SAID STREAM AND LEAN OIL AND TO VAPORIZE SAID IMPURE PROPANE; COMPRESSING THE THUS VAPORIZED SAID IMPURE PROPANE; CONDENSING THE THUS COMPRESSED IMPURE PROPANE AND RECYCLING SAME TO SAID HEAT EXCHANGE RELATIONSHIP; AND WITHDRAWING AND PASSING NONCONDENSIBLE MATERIAL FROM SAID CONDENSED IMPURE PROPANE TO SAID DEETHANIZING ZONE FOR REMOVAL OF THE NONCONDENSIBLES AND RECOVERY OF PROPANE.