Overhead vapor condenser for cooling liquid for rotary pump seal

Claim 1

A METHOD FOR REGULATING THE PRESSURE IN A FRACTIONAL DISTILLATION ZONE OPERATING UNDER SUBATMOSPHERIC PRESSURE WHEREIN UNCONDENSIBLE GASES ENTER THE OIPERATION COMPRISING WITHDRAWING OVERHEAD VAPOROUS PRODUCT FROM SAID DISTILLATION ZONE AT A SUBATMOSPHERIC PRESSURE: CONDENSING A PORTION OF THIS WITHDRAWN PRODUCT THEREBY PRODUCING A CONDENSATE AND UNCONDENSED GASES, THESE LATTER COMPRISING SAID UNCONDENSIBLE GASES; DIVIDING SAID CONDENSATE INTO TWO PROTIONS; PASSING SAID UNCONDENSED GASES AND ONE PORTION OF SAID CONDENSATE INTO A COMPRESSING ZONE AT A SUBATMOSPHERIC PRESSURE AND THEREIN COMPRESSING THE UNCONDENSED GASES, IN THE PRESENCE OF SAID ONE PORTION OF CONDENSATE AS SEALING LIQUID IN SAID ZONE TO A SUPERATMOSPHERIC PRESSURE; SEPARATING CONDENSATE FROM THE COMPRESSED GASES AND COMBINING THE SEPARATAED CONDENSATE WITH THE FIRST PRODUCED CONDENSATE; RECYCLING A PORTION OF THESE LATTER SEPARATED COMPRESSED GASES INTO SAID COMPRESSING ZONE AS A PORTION OF THE FEED THERETO; SENSING THE PRESSURE IN SAID DISTILLATION ZONE; AND REGULATING THE RATE OF SAID RECYCLING INTO SAID COMPRESSING ZONE IN RESPONSE TO THE SENSED PRESSURE, THEREBY MAINTAINING A PREDETERMINED SUBATMOSPHERIC PRESSURE THEREIN; AND CHILLING IN A CONDENSING STEP THE REMAINDER OF SAID LATTER SEPARATED COMPRESSED GASES THEREBY PRODUCING ADDITIONAL CONDENSATE AND UNCONDENSED GASES COMPRISING SAID UNCONDENSIBLE GASES AS A FINAL PRODUCT, THE FIRST PRODUCED CONCENSATE AND ADDITIONAL CONDENSATE BEING SAID OVERHEAD DISTILLATION PRODUCT OF INCREASED YIELD.

Claim 2

A METHOD FOR REGULATING THE PRESSURE IN A FRACTIONAL DISTILLATION ZONE OPERATING UNDER SUBATMOSPHERIC PRESSURE WHEREIN UNCONDENSIBLE GASES ENTER THE OIPERATION COMPRISING WITHDRAWING OVERHEAD VAPOROUS PRODUCT FROM SAID DISTILLATION ZONE AT A SUBATMOSPHERIC PRESSURE: CONDENSING A PORTION OF THIS WITHDRAWN PRODUCT THEREBY PRODUCING A CONDENSATE AND UNCONDENSED GASES, THESE LATTER COMPRISING SAID UNCONDENSIBLE GASES; DIVIDING SAID CONDENSATE INTO TWO PROTIONS; PASSING SAID UNCONDENSED GASES AND ONE PORTION OF SAID CONDENSATE INTO A COMPRESSING ZONE AT A SUBATMOSPHERIC PRESSURE AND THEREIN COMPRESSING THE UNCONDENSED GASES, IN THE PRESENCE OF SAID ONE PORTION OF CONDENSATE AS SEALING LIQUID IN SAID ZONE TO A SUPERATMOSPHERIC PRESSURE; SEPARATING CONDENSATE FROM THE COMPRESSED GASES AND COMBINING THE SEPARATAED CONDENSATE WITH THE FIRST PRODUCED CONDENSATE; RECYCLING A PORTION OF THESE LATTER SEPARATED COMPRESSED GASES INTO SAID COMPRESSING ZONE AS A PORTION OF THE FEED THERETO; SENSING THE PRESSURE IN SAID DISTILLATION ZONE; AND REGULATING THE RATE OF SAID RECYCLING INTO SAID COMPRESSING ZONE IN RESPONSE TO THE SENSED PRESSURE, THEREBY MAINTAINING A PREDETERMINED SUBATMOSPHERIC PRESSURE THEREIN; AND CHILLING IN A CONDENSING STEP THE REMAINDER OF SAID LATTER SEPARATED COMPRESSED GASES THEREBY PRODUCING ADDITIONAL CONDENSATE AND UNCONDENSED GASES COMPRISING SAID UNCONDENSIBLE GASES AS A FINAL PRODUCT, THE FIRST PRODUCED CONCENSATE AND ADDITIONAL CONDENSATE BEING SAID OVERHEAD DISTILLATION PRODUCT OF INCREASED YIELD.