Fractionation control system

Claim 1

IN A FRACTIONATION SYSTEM WHEREIN A FLUID MIXTURE TO BE SEPARATED IS INTRODUCED INTO A FRACTIONATION COLUMN THROUGH A FIRST CONDUIT, VAPORS ARE REMOVED FROM THE TOP OF SAID COLUMN THROUGH A SECOND CONDUIT, SAID VAPORS ARE CONDENSED AND A PORTION OF THE CONDENSATE IS RETURNED TO SAD COLUMN AS REFLUX THROUGH A THIRD CONDUIT, AND LIQID IS REMOVED FROM THE BOTTOM OF SAID COLUMN THROUGH A FOURTH CONDUIT, A CONTROL SYSTEM COMPRISING FIRST MEANS OPERATIVELY CONNECTED TO SAID SECOND CONDUIT TO ESTABLISH A FIRST SINGAL REPRESENTATIVE OF THE SQUARE OF THE RATE OF FLOW THROUGH SAID SECOND CONDUIT, SECOND MEANS OPERATIVELY CONNECTED TO SAID SECOND AND THIRD CONDUITS TO ESTABLISH A SECOND SIGNAL REPRESENTATIVE OF THE QUANTITY (1+5$T)2 WHERE K IS A CONSTANT AND $T IS THE DIFFERENCE IN TEMPERATURE OF FLUIDS IN SAID SECOND AND THIRD CONDUITS, THIRD MEANS OPERATIVELY CONNECTED TO SAID THIRD CONDUIT TO ESTABLISH A THIRD SIGNAL REPRESENTATIVE OF THE SQUARE OF THE RATE OF FLOW THROUGH SAID THIRD CONDUIT, FOURTH MEANS RESPONSIVE TO SAID FIRST, SECOND AND THIRD MEANS TO ESTABLISH OF FOURTH SIGNAL REPRESENTATIVE OF THE PRODUCT OF SAID SECOND AND THIRD SIGNALS DIVIDED BY SAID FIRST SIGNAL, AND FIFTH MEANS RESPONSIVE TO SAID FOURTH MEANS TO ADJUST THE RATE OF FLOW THROUGH SAID THIRD CONDUIT.