| 摘要 |
774,255. Cold separation of gas mixtures. COMMISSARIAT A L'ENERGIE ATOMIQUE. July 20, 1955 [Aug. 6, 1954; June 30, 1955], No. 20960/55. Class 8(2) Removal of condensible impurities from a gas mixture in a line 3 e.g. the nitrogen content of a hydrogen - deuterium mixture prior to rectification in a column 34 discharging deuterium through a line 35 and liquid hydrogen through a line 17 is effected in one or other of reversible exchangers 1, 2 of the Hampson type e.g. exchanger 1, the nitrogen free mixture then traverses a cooling coil 9 in a bath of liquid hydrogen and is returned through the tubes of the exchanger 1 in countercurrent heat exchanger with the mixture after which it traverses the tubes of the other exchanger 2 in countercurrent exchange with downwardly flowing hydrogen gas effecting vaporization of the nitrogen condensed during the previous cycle. The mixture leaving the tubes of exchanger 1 is warmed by a bath of liquid nitrogen to the temperature at which the mixture first enters the exchanger 1 and the liquid hydrogen in line 17 is vaporized in an exchanger 18 before entering the cold end of exchanger 2. With the latter exchanger being derimed and exchanger 1 in use, valves 4, 7, 14, 20, 22 are open and valves 5, 8, 10, 15 are closed. During a changeover a normally closed valve 27 in a bypass line 26 is opened. In a modification the cooling coil at the cold end of each exchanger is replaced by an auxiliary exchanger of the same type as the main exchangers; 'the tubes of the auxiliary exchanger in use being traversed by returning hydrogen which then traverses the chamber of the other auxiliary exchanger prior to transversing the chamber of the main exchanger 2 being derimed.
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