method and device for the separation of dreistoffgemischen, in which two components of a azeotrop boiling mixtures by tieftemperaturrektifikation

摘要

PICT:0933328/III/1 The separation by rectification of ternary mixtures which are normally gaseous in which two components form an azeotrope is effected by fractionation in a first zone from which is withdrawn a fraction comprising a major proportion of the non-azeotrope component together with the other two components in a ratio such that they may be separated in a rectification zone without the azeotropic point being reached and rectifying the withdrawn fraction to separate one of the azeotropic components. A mixture of ethylene with acetylene and ethane is fed by line 3 into rectifying column 1 where ethane is removed through line 4 as liquid and gaseous ethylene through line 5. A liquid mixture is removed by line 13 which contains 1-7 times as much acetylene as ethane and for example contains 98% ethylene, 0,8% ethane and 1,2% ethylene. This is separated in column 2 into acetylene or an acetylene concentrate through line 14 and a gaseous ethaneethylene mixture which is returned to column 1 by line 15. The separation of carbon dioxide and propylene mixed with ethylene or hydrogen sulphide is also referred to.