Control of absorber product

Claim 1

A METHOD OF CONTROLLING THE PERCENTAGE OF PROPANE RECOVERY FROM A NATURAL GAS IN AN ADSORPTION SYSTEM, COMPRISING PASSING THE FIELD INTO AN ADSORPTION SYSTEM, ESTABLISHING A FIRST SIGNAL REPRESENTATIVE OF THE RATE OF FLOW OF SAID FIELD GAS INTO SAID ABSORBER, ESTABLISHING A SECOND SIGNAL REPRESENTATIVE OF THE PERCENTAGE OF PROPANE IN SAID FIELD GAS AS IT PASSES INTO SAID ABSORBER, ESTABLISHING A THIRD SIGNAL REPRESENTATIVE OF THE RATE OF FLOW OF PROPANE INTO SAID ABSORBER RESPONSIVE TO THE PRODUCT OF SAID FIRST SIGNAL AND SAID SECOND SIGNAL, INJECTING A PARTIALLY PRESATURATED ABSORBER OIL INTO SAID ABSORBER TO CONTACT SAID FIELD GAS AND ABSORBER CERTAIN COMPONENTS OF SAID FIELD GAS, REMOVING THE UNABSORBED GASES AS RESIFUE GAS, WITHDRAWING FROM SAID ABSORBER THE RICH ABSORBER OIL, PASSING SAID RICH ABSORBER OIL INTO A STILL THEREIN SEPARATING THE ABSORBER GASES FROM SAID RICH ABSORBER OIL, PASSING THE GASES THUS OBTAINED IN SAID STILL TO DETHANIZER, REMOVING IN SAID DEETHANIZER ETHANE AND LIGHTER GASES AND SOME PROPANE AS OVERHEAD, PASSING THE LEAN ABSORBER OIL FROM SAID STILL INTO A REABSORBER, PASSING AT LEAST A PORTION OF SAID OVERHEAD FROM SAID DEETHANIZER INTO SAID REABSORBER AND INTO CONTACT WITH SAID LEAN OIL, ESTABLISHING A FOURTH SIGNAL REPRESENTATIVE OF THE PRESSURE OF THE OVERHEAD OF SAID REABSORBER, ESTABLISHING A FIFTH SIGNAL REPRESENTATIVE OF THE VAPOR PRESSURE OF A STANDARD SAMPLE OF PROPANE AND LEAN OIL, SAID STANDARD SAMPLE BEING LOCATED IN THE LIQUID PHASE IN SAID REABSORBER, ESTABLISHING WITH A DIFFERTIAL VAPOR PRESSURE CONTROLLER A SIXTH SIGNAL REPRESENTATIVE OF THE DIFFERENTIAL VAPOR PRESSURE BETWEEN SAID STANDARD SAMPLE AND THE PARTIALLY SATURATED ABSORBER OIL FROM THE REABSORBER, CONTROLLING THE PRESSURE OF SAID OVERHEAD OF SAID REABSORBER RESPONSIVE TO SAID SIXTH SIGNAL AND A SETPOINT ON SAID DIFFERENTIAL VAPOR PRESSURE CONTROLLER, ESTABLISHING A SEVENTH SIGNAL REPRESENTATIVE OF THE RATE OF FLOW OF SAID RESIDUE GAS, ESTABLISHING AN EIGHTH SIGNAL REPRESENTATIVE OF THE PERCENTAGE OF PROPANE IN SAID RESIDUE GAS, ESTABLISHING A NINTH SIGNAL REPRESENTATIVE OF THE RATE OF FLOW OF PROPANE IN SAID RESIDUE GAS RESPONSIVE TO THE PRODUCT OF SAID SEVENTH SIGNAL AND SAID EIGHT SIGNAL, ESTABLISHING A TENTH SIGNAL REPRESENTATIVE OF THE RATIO OF THE DIFFERENCE BETWEEN SAID THIRD SIGNAL AND SAID NINTH SIGNAL TO SAID THIRD SIGNAL, CONTROLLING SAID SETPOINT ON SAID DIFFERENTIAL VAPOR PRESSURE CONTROLLER RESPONSIVE TO SAID OVERHEAD OF SAID REABSORBER IS INCREASED, RESULTING IN A GREATER AMOUNT OF PROPANE ABSORBED IN THE LEAN OIL IN SAID REABSORBER UPON AN INCREASE IN SAID RATIO.

Claim 2

A METHOD OF CONTROLLING THE PERCENTAGE OF PROPANE RECOVERY FROM A NATURAL GAS IN AN ADSORPTION SYSTEM, COMPRISING PASSING THE FIELD INTO AN ADSORPTION SYSTEM, ESTABLISHING A FIRST SIGNAL REPRESENTATIVE OF THE RATE OF FLOW OF SAID FIELD GAS INTO SAID ABSORBER, ESTABLISHING A SECOND SIGNAL REPRESENTATIVE OF THE PERCENTAGE OF PROPANE IN SAID FIELD GAS AS IT PASSES INTO SAID ABSORBER, ESTABLISHING A THIRD SIGNAL REPRESENTATIVE OF THE RATE OF FLOW OF PROPANE INTO SAID ABSORBER RESPONSIVE TO THE PRODUCT OF SAID FIRST SIGNAL AND SAID SECOND SIGNAL, INJECTING A PARTIALLY PRESATURATED ABSORBER OIL INTO SAID ABSORBER TO CONTACT SAID FIELD GAS AND ABSORBER CERTAIN COMPONENTS OF SAID FIELD GAS, REMOVING THE UNABSORBED GASES AS RESIFUE GAS, WITHDRAWING FROM SAID ABSORBER THE RICH ABSORBER OIL, PASSING SAID RICH ABSORBER OIL INTO A STILL THEREIN SEPARATING THE ABSORBER GASES FROM SAID RICH ABSORBER OIL, PASSING THE GASES THUS OBTAINED IN SAID STILL TO DETHANIZER, REMOVING IN SAID DEETHANIZER ETHANE AND LIGHTER GASES AND SOME PROPANE AS OVERHEAD, PASSING THE LEAN ABSORBER OIL FROM SAID STILL INTO A REABSORBER, PASSING AT LEAST A PORTION OF SAID OVERHEAD FROM SAID DEETHANIZER INTO SAID REABSORBER AND INTO CONTACT WITH SAID LEAN OIL, ESTABLISHING A FOURTH SIGNAL REPRESENTATIVE OF THE PRESSURE OF THE OVERHEAD OF SAID REABSORBER, ESTABLISHING A FIFTH SIGNAL REPRESENTATIVE OF THE VAPOR PRESSURE OF A STANDARD SAMPLE OF PROPANE AND LEAN OIL, SAID STANDARD SAMPLE BEING LOCATED IN THE LIQUID PHASE IN SAID REABSORBER, ESTABLISHING WITH A DIFFERTIAL VAPOR PRESSURE CONTROLLER A SIXTH SIGNAL REPRESENTATIVE OF THE DIFFERENTIAL VAPOR PRESSURE BETWEEN SAID STANDARD SAMPLE AND THE PARTIALLY SATURATED ABSORBER OIL FROM THE REABSORBER, CONTROLLING THE PRESSURE OF SAID OVERHEAD OF SAID REABSORBER RESPONSIVE TO SAID SIXTH SIGNAL AND A SETPOINT ON SAID DIFFERENTIAL VAPOR PRESSURE CONTROLLER, ESTABLISHING A SEVENTH SIGNAL REPRESENTATIVE OF THE RATE OF FLOW OF SAID RESIDUE GAS, ESTABLISHING AN EIGHTH SIGNAL REPRESENTATIVE OF THE PERCENTAGE OF PROPANE IN SAID RESIDUE GAS, ESTABLISHING A NINTH SIGNAL REPRESENTATIVE OF THE RATE OF FLOW OF PROPANE IN SAID RESIDUE GAS RESPONSIVE TO THE PRODUCT OF SAID SEVENTH SIGNAL AND SAID EIGHT SIGNAL, ESTABLISHING A TENTH SIGNAL REPRESENTATIVE OF THE RATIO OF THE DIFFERENCE BETWEEN SAID THIRD SIGNAL AND SAID NINTH SIGNAL TO SAID THIRD SIGNAL, CONTROLLING SAID SETPOINT ON SAID DIFFERENTIAL VAPOR PRESSURE CONTROLLER RESPONSIVE TO SAID OVERHEAD OF SAID REABSORBER IS INCREASED, RESULTING IN A GREATER AMOUNT OF PROPANE ABSORBED IN THE LEAN OIL IN SAID REABSORBER UPON AN INCREASE IN SAID RATIO.