Method of separation of hydrocarbons by a single absorption oil

Claim 1

IN A CYCLIC METHOD FOR THE TREATMENT OF A MIXTURE OF GASES INCLUDINMG HYDROCARBONS IN THE RANGE OF METHANE TO NONANE, THE STEPS OF CONTACTING IN A FIRST STAGE SUCH A FEED MIXTURE IN COUNTERCURRENT RELATION WITH AN ABSORBER OIL WHICH IS A LEAN OIL OF HYHDROCARBONS HAVING A HIGHER MOLECULAR WEIGHT THAN THE FEED MIXTURE AND LIQUEFIED FRACTIONS OF HIGHER MOLECULAR WEIGHT HYDRACARBONS OF SAID FEED MIXTURE TO PRODUCE A FIRST ABSORBER OIL ENRICHED IN THE HIGHER MOLECULAR WEIGHT HYDROCARBONS FROM SAID FEED MIXTURE AND INCLUDING RESIDUAL LOWER MOLECULAR WEIGHT HYDROCARBONS AND A FIRST LOW MOLECULAR WEIGHT HYDROCARBON ENRICHED GAS, DISTILLING INM A DISTALLATION STAGE SAID FIRST ABSORBER OIL TO SEPARATE SAID RESIDUAL LOW MOLECULAR WEIGHT HYDROCARBONS AS A SECOND LOW MOLECULAR WEIGHT HYDROCARBON ENRICHED GAS FROM A SECOND ABSORBER OIL INCLUDING SAID LIQUEFIED HIGHER MOLECULAR WEIGHT HYDROCARBONS FROM SAID FEED MIXTURE, PASSING SAID SECOND OBSORBER OIL THROUGH A SEPARATING STAGE TO PRODUCE A PRODUCT OF HIGHER MOLECULAR WEIGHT HYDROCARBONS FROM SAID FEED MIXTURE AND LEAN ABSORBER OIL, MIXING SAID FIRST AND SECOND LOWER MOLECULAR WEIGHT HYDROCARBON ENRICHED GASES WITH AN INTERMEDIATE RICH OIL FROM A THIRD STAGE, PASSING THE RESULTANT MIXTURE THROUGH A COOLING ABSORPTION SECOND STAGE, PASSING THE RESULTANT COOLED MIXTURE FROM SAID ABSORPTION STAGE TO A SEPARATING STATE TO SEPARATE A GAS PRODUCT RICH IN LOW MOLECULAR WEIGHT HYDROCARBONS AND SAID ABSORBER OIL, PASSING SAID SEPARATED GAS PRODUCT FROM SAID SEPARATING STAGE IN COUNTERCURRENT RELATION IN SAID THIRD STAGE WITH LEAN ABSORBER OIL FROM SAID SEPARATION STAGE TO PRODUCE A GAS PRODUCT OF THE LOW MOLECULAR WEIGHT HYDROCARBONS IN SAID FEED MIXTURE AND SAID INTERMEDIATE RICH OIL, AND PASSING THE RESULTING SAID OBSORBER OIL FROM SAID OPERATING STAGE INTO SAID FIRST STAGE AS THE ABSORBER OIL.