| 摘要 |
804,944. Cold separation of air. BRITISH OXYGEN CO. Ltd. Aug. 6, 1957 [Aug. 7, 1956], No. 24181/56. Class 8(2). In a low temperature air rectification process for the production of at least one liquid constituent e.g. liquid oxygen, part of the cold requirement is met by the evaporation of liquid methane. In operation liquid methane is vapourized in heat exchangers A, A<SP>1</SP>, A<SP>11</SP> traversed by a countercurrent flow of inert gas e.g. argon performing a closed cycle comprising a compressor 14, a cooler 15, the heat exchangers A, A<SP>1</SP>, A<SP>11</SP>, an expansion valve 16 and heat exchangers 12, 11 through which flow the air to be cooled prior to rectification in the column 13 and cold waste nitrogen therefrom. The amount of argon liquified in the vaporizer is controlled by a valved by-pass 17. In a modification nitrogen is used as the inert gas and in a further modification a mixture of nitrogen and argon is used. |
