| 摘要 |
794,942. Cold separation of gas mixtures. AIR PRODUCTS, Inc. June 7, 1956 [June 9, 1955], No. 17567/56. Class 8(2). In a low temperature rectification process for separating a high boiling point fraction, e.g., argon from a low boiling point fraction including an incondensible component, e.g., a mixture of nitrogen and hydrogen comprising feeding the initial gas mixture through a duct 11 into a rectification column 10 having in its upper portion a condenser 14 cooled by a stream of liquid nitrogen so as to provide a downward flow of reflux over trays 12, the condenser 14 comprises a central gas uptake tube 15 leading to a chamber 17 and a plurality of downflow tubes 16 connecting chamber 17 to a lower chamber 19 which is separated from the trays 12 by a plate 20 provided with reflux distributing tubes 26 and is provided with a valvecontrolled uncondensed gas outlet 25 thereby ensuring a pressure drop between chambers 17, 19 and so preventing a gas lock in the tubes 16. A suitable feed gas comprises 75 to 89 per cent argon, 10 to 25 per cent nitrogen and 1 to 5 per cent hydrogen and the composition of the gas withdrawn from the condenser chamber 19 may be 50 to 80 per cent nitrogen, 8 to 12 per cent hydrogen and the balance argon. Product liquid argon is withdrawn from the base of the column.
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