Automatic controls for the liquefaction and separation of gases

Claim 1

A PROCESS FOR THE SEPARATION OF A MIXTURE OF GASES COMPRISING PASSING THE MIXTURE THROUGH A FIRST HEAT EXCHANGING ZONE TO LIQUEFY A PORTION OF SAID MIXTURE, INTRODUCING THE THUS COOLED MIXTURE INTO A FIRST SEPARATION ZONE, REMOVING FLUID FROM SAID FIRST SEPARATION ZONE, REMOVING UNCONDENSED GASES FROM SAID FIRST SEPARATION ZONE, COOLING THE THUS WITHDRAWN UNCONDENSED GASES TO LIQUEFY A PORTION THEREOF, INTRODUCING THE RESULTING COOLED FLUID INTO A SECOND SEPARATION ZONE, ESTABLISHING A FIRST SIGNAL REPRESENTATIVE OF THE LIQUID LEVEL IN SAID FIRST SEPARATION ZONE, ESTABLISHING A SECOND SIGNAL REPRESENTATIVE OF THE PRESSURE IN SAID SECOND SEPARATION ZONE, CONTROLLING THE RATE OF INTRODUCTION OF THE COOLED FLUID INTO SAID SECOND SEPARATION ZONE RESPONSIVE TO SAID FIRST SIGNAL DURING NORMAL OPERATIONS AND RESPONSIVE TO SAID SECOND SIGNAL DURING START UP PROCEDURES AND DURING SYSTEM UPSETS.