| 摘要 |
1,105,925. Adsorption process for purifying gases LINDE A.G. 8 June, 1965 [5 June, 1964], No. 24127/65. Heading B1L. Compressed crude gas or gas mixtures boiling below 50‹K such as H 2 , He. or Ne, are freed from the 'bulk of the low boiling impurities present therein in a first adsorption stage comprising at least two adsorbers which can be switched between adsorption, regeneration, and recooling phases in succession, and are then freed from the remaining low boiling impurities at a lower temperature in a second adsorption stage having at least one adsorber. Incoming raw H 2 from compressor 1 is freed from CO 2 and H 2 O by adsorbers 3 and 5 and cooled to below 100‹K by heat exchangers 2, 4, and 6, and then to 90‹K by bath 8 of liquid N 2 . Liquid CH 4 condenses and is collected at 9, while the crude H 2 containing e.g. 2% CO, CH 4 and N 2 is now fed to the first-stage adsorbers of which 10 is in the adsorption, 12 in the regeneration and 11 in the recooling phase. The gas leaving adsorber 10 is recooled in the N 2 bath 8, some of the effluent gas in duct 14 being used to recool adsorber 11 before it rejoins the main stream to the next stage. Heat exchanger 17 cools the gas stream containing, for example, 100 ppm of impurities, to 35-45‹K before it enters one of adsorbers 20, 21. The effluent H 2 contains 0.5 ppm of impurities. The adsorbent in all the adsorbers may be silica gel or a molecular sieve. Adsorber 12 is incompletely regenerated at 180-220‹K. for re-use by means of a scavenging gas; reduced pressure may also be used in regeneration. Incomplete regeneration is preferred to complete because less recooling, is thereby needed. |
