| 摘要 |
972,044. Cold separation of gas mixtures. GES. FUR LINDE'S EISMASCHINEN A.G. June 26, 1963 [July 4, 1962], No. 25375/63. Heading F4P. [Also in Division G6] Reduction of the content of low boiling trace impurities e.g. carbon monoxide, methane, nitrogen, oxygen and rare gases found in carbon dioxide is effected in a rectification column 17 to which feed gas is admitted through an expansion nozzle 16, pure liquid carbon dioxide is withdrawn from the base through a duct 21 and impurity-rich carbon dioxide effluent gas is withdrawn from the head through a duct 30 and said effluent is condensed in part in an exchanger 26 and returned through a duct 31 to serve as reflux whilst the uncondensed effluent gas is used to cool incoming feed gas in an exchanger (not shown). In operation compressed crude carbon dioxide having been cooled in exchangers 12; 13 is expanded into a chamber 14, liquefied in an exchanger 15 cooled by liquid carbon dioxide in duct 21, and a portion thereof expanded at nozzle 16 whilst the remainder is expanded at a value 19 into a separating chamber 20 into which is also expanded at a valve 24 pure liquid carbon dioxide from the exchanger 15 at a valve 34 crude liquid carbon dioxide from chamber 14. The liquid carbon dioxide from chamber 20 is vaporized in exchanger 26, added to vapour from chamber 20 and is forced by a compressor 28 into a duct 29 leading to a nuclear reactor, Fig. 1 (not shown), to serve as coolant. Contaminated effluent is vented to atmosphere through a duct 32. |
