| 摘要 |
The invention provides a process and apparatus for the separation of a gaseous feed comprising a mixture of hydrocarbons and nitrogen gas, the process comprising the steps of: (i) cooling and at least partially condensing the gaseous feed; (ii) feeding the cooled and at least partially condensed feed from step (i) to a fractionation column comprising reboil to produce an overhead hydrocarbon vapour stream enriched in nitrogen and a condensed hydrocarbon product stream low in nitrogen, wherein prior to the fractionation, the feed stream is divided into at least two streams including: a) a first stream which is expanded and fed to the fractionation column; b) a second stream which is expanded, heated and fed to a lower stage of the fractionation column than the first stream, (iii) removing a hydrocarbon product stream low in nitrogen from the fractionation column; and (iv) removing a hydrocarbon vapour stream enriched in nitrogen from the fractionation column. |
