| 摘要 |
799,351. Cold separation of gas mixtures. STAMICARBON N. V. Sept. 30, 1955 [Oct. 1, 1954], No. 27939/55. Class 8(2). In a process for condensing impurities from a gas mixture e.g., nitrogen and argon from hydrogen prior to the separation of the deuterium content of the hydrogen comprising passing the crude hydrogen alternatively through sets of regenerators 1, 2 and 3, 4, Fig. 1, or reversing heat exchangers the regenerator 3, 4 not in use being simultaneously scavenged by a reverse flow of flushing hydrogen, the crude hydrogen traversing the regenerators 1, 2 also flows in countercurrent heat exchange with colder hydrogen in ducts b of the regenerators and the flushing hydrogen also flows in countercurrent heat exchange with warmer hydrogen in ducts c of the regenerators and the flow of at least one of these countercurrents is so varied that the temperature at any place in the regenerator or regenerators is on average lower during a deposition period than the average temperature at that place during evaporation. In operation a washing cycle is divided into four periods. In the first crude hydrogen at about 65‹K and 12 atm. pressure pans from ducts g through previously cooled packed spaces a of regenerators 1, 2 in countercurrent to colder low pressure hydrogen at 1À3 atm. in ducts b supplied from ducts e; the counterflow through duct b of regenerator 2 being less than that through duct b of regenerator 1 resulting in a fall in temperature of the latter and a rise in the former. Similarly the amount of warm hydrogen at 100 atm. pressure traversing a duct c of regenerator 4 in countercurrent heat exchange with cold flushing hydrogen at 12 atm. pressure passing from a duct h through the contaminated space a of said regenerator 4 is also greater than the amount tranversing the duct c of regenerator 3. This results in the temperature of regenerator 3 rising and that of regenerator 4 falling. During the third period the previously cooled and cleaned spaces a of regenerators 3, 4, Fig. 3, serve to condense nitrogen from crude hydrogen in counterflow with cold low pressure hydrogen in ducts b ; the flow through duct b of regenerator 3 being greater than that through duct b of regenerator 4 whilst more warm high pressure hydrogen traverses duct c of regenerator 1 than traverses duct c of regenerator 2. During the final period regenerators 2, 4, Fig. 4, are again switched, the amount of cold low pressure hydrogen traversing duct b of regenerator 2 being greater than that traversing duct b of regenerator 3 and the amount of warm high pressure hydrogen traversing duct c of regenerator 4 being greater than that traversing duct c of regenerator 1. Specification 647,654 is referred to.
|
