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Method and apparatus for controlling fractionating columns

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1. APPARATUS FOR STABILIZING THE PURITY OF OXYGEN COLLECTING IN THE LOWER END OF AN AIR FRACTIONATING COLUMN HAVING AN OXYGEN WITHDRAWAL LINE COMPRISING, MEANS SENSITIVE TO TEMPERATURE CHANGES AT A LEVEL IN THE COLUMN WHERE THE OXYGEN IS AT THE MAXIMUM PURITY, MEANS SENSITIVE TO TEMPERATURE CHANGES AT ANOTHER LEVEL IN THE COLUMN IN THE NEIGHBORHOOD OF THE POINT WHERE THE ARGON CONCENTRATION IS BEGINNING TO DECREASE FROM MAXIMUM CONCENTRATION AND THE NITROGEN CONCENTRATION IS LOW BUT IS BEGINNING TO INCREASE, AND MEANS ACTUATED BY THE FIRST AND SECOND CLAIMED MEANS IN RESPONSE TO CHANGES IN THE TEMPERATURE DIFFERENTIAL BETWEEN THE TWO LEVELS TO CONTROL THE RATE OF THE OXYGEN WITHDRAWAL THROUGH THE WITHDRAWAL LINE.
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