| 摘要 |
890,486. Cold separation of gas mixtures. SOC. L' AIR LIQUIDE, SOC. ANON POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE. Nov. 27, 1959 [Nov. 28, 1958], No. 40427/59. Class 8(2). A process for separating ethylene and ethane from a compressed mixture thereof containing C 3 hydrocarbons and low boiling constituents such as methane, hydrogen, nitrogen and carbon monoxide comprises partially condensing the mixture entering the system through a duct 1 in exchangers 4, 7 and 9, withdrawing the condensed portion from a separator 10, further cooling it in exchangers 12, 13, expanding at a valve 15, feeding to a degassing column 16, withdrawing a mixture of liquid ethylene, C3 hydrocarbons and ethane from column 16 and passing it through a duct 34 to a first separating column 35, passing a gaseous mixture of ethane and ethylene from the head of said column through a duct 48 leading to a second rectification column 49, withdrawing gaseous ethylene through a duct 53, compressing a portion at 57, condensing a first portion of the compressed ethylene in the boiler 61 of column 49 and thereafter passing the condensed ethylene through a duct 64 and expanding it at a valve 65 for use as reflux in column 49 and also condensing the remainder of the compressed ethylene in the boiler 70 of the degassing column 16 and adding it to the condensed ethylene from the boiler 61 of said second column 49 prior to expansion at valve 65 and use as reflux. Product ethylene gas bled from duct 53 into a duct 55 serves to cool the mixture in exchangers 4, 9 as does product ethane leaving the base of column 49 through a duct 52. Product C3 hydrocarbons leaving the base of column 35 is forced by a pump 41 through the exchanger 7 which acts as the boiler for column 35 and a portion of the resulting vapour is returned through a duct 47 to the column 35 whilst the remainder is passed through exchanger 4 and is discharged through a duct 45.
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