| 摘要 |
1,069,576. Cold separation of air. SOC. ANON. L'AIR LIQUIDE POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE. Aug. 20, 1964 [Aug. 21, 1963], No. 34164/64. Heading F4P. A two-stage air rectification process for the production of substantially pure gaseous oxygen and gaseous oxygen of about 70% purity comprises withdrawing oxygen-rich liquid of about 40% purity from the base of a high pressure column (25), Fig. 1 (not shown), through a line (37), in part expanding it at a valve (44) into the low pressure column (50) whilst expanding the remainder at a valve (45) and passing it through a line (46) leading to a heat exchanger (47) to which feed air is supplied through a line (9) at a pressure intermediate that of the columns (25, 50) and thereafter feeding the sovaporized oxygen-rich air to the column (50), liquefying a first portion of the nitrogen formed in the upper part of column (50) in a condenser (36) traversed by evaporating pure liquid oxygen withdrawn from column (50) through a line (64) and liquefying a second portion of the nitrogen by withdrawing it through a line (57) leading to a liquefier (58) traversed by liquid oxygen of 70% purity withdrawn from column (50) through a line (71); the so-evaporated liquid oxygen of 70% purity being withdrawn as product through lines (72, 76) reversible paths (21, 22) of a conventional heat exchanger (20) serving to cool a portion of feed air and an outlet (79), whilst pure oxygen is withdrawn from condenser (36) through a line (68), a non- reversible path (23) of exchanger (20) and an outlet (69) of the total feed is compressed at 2 to 2À2 atmospheres and 25% thereof is cooled in nitrogen regeneration (4A, 4B) liquefied at (47) and fed to columns (25, 50) whilst the remaining 75% is further compressed at 100 to 5À8 atmospheres and cooled in nitrogen regenerators (12A, 12B) and paths (21, 22) of reversing heat exchanger (20) and fed through lines (16, 24) to column (25). The 3% portion of the feed air is compressed at (27) to 15 atmospheres, freed of condensibles in an absorber 28, cooled in exchangers (30, 3) and the boiling coil (34) of column (25) and thereafter expanded through a valve (35) to said column (25). |
