NOVELTY - Removing gaseous contaminants from feed gas stream, comprises: cooling feed gas stream to slurry of solid contaminant, liquid phase contaminant and methane enriched gaseous phase; introducing slurry (7) to separation device; removing methane enriched gaseous phase stream; introducing liquid phase contaminant stream into device; passing diluted slurry through heat exchanger (8); removing liquid phase contaminants stream; separating into liquid product stream and recirculation stream; and introducing removed liquid phase contaminants stream and recirculation stream into device.    USE - The processes are useful for: removing gaseous contaminants from feed gas stream purified gas stream and liquefying the feed gas stream comprising purifying the feed gas stream (all claimed); and removing carbon dioxide from carbon dioxide comprising streams.    ADVANTAGE - The process prevents the risk of blockages in pipelines or heat exchangers after the separation device is minimal, and no damages will occur to any devices having moving parts, as pumps.    DETAILED DESCRIPTION - Removing gaseous contaminants from a feed gas stream comprising methane and gaseous contaminants, comprises: (a) providing the feed gas stream; (b) cooling the feed gas stream to a temperature at which a slurry (7) is formed which comprises solid contaminant, liquid phase contaminant and a methane enriched gaseous phase; (c) introducing the slurry into the top part or intermediate part of a cryogenic separation device (2); (d) removing from the top part of the separation device a stream which comprises the methane enriched gaseous phase; (e) introducing a stream comprising liquid phase contaminant into the intermediate part or the bottom part of the separation device or both to dilute the slurry which has been introduced into the separation device in step (c); (f) passing the diluted slurry as obtained in step (e) through a heat exchanger (8) which is arranged inside the separation device, whereby at least part of the solid contaminant present in the diluted slurry is melted into liquid phase contaminant; (g) removing from the separation device by means of a pump, preferably an eductor, a stream comprising liquid phase contaminant, which pump is situated below the heat exchanger and arranged outside or inside the separation device or partly inside or outside the separation device; (h) removing a stream comprising liquid phase contaminant from the separation device at a position below the slurry level in the separation device; (i) separating the stream of liquid phase contaminant obtained in step (h) into a liquid product stream and a recirculation stream which is used as a motive fluid in the eductor in the case that an eductor is used; and (j) introducing into the separation device at least part of the stream as removed in step (g) and at least part of the recirculation stream as obtained in step (i). INDEPENDENT CLAIMS are also included for:    (1) a cryogenic separation device for carrying out the process comprising: a top part, an intermediate part and a bottom part; means to introduce the slurry into the top or intermediate part of the separation device; means to remove the methane enriched gaseous phase from the top part of the separation device; means for introducing the stream comprising liquid phase contaminant into the top or intermediate part of the separation device to dilute the slurry inside the separation device; a heat exchanger arranged inside the separation device; a pump, preferably an eductor, which is arranged inside or outside the separation device or partly inside and outside the separation device at a level which is below the level at which the heat exchanger is arranged for removing a stream comprising liquid phase contaminant from the separation device; means to remove the stream comprising liquid phase contaminant from the intermediate or bottom part of the separation device; and means to separate liquid phase contaminant removed from the intermediate or bottom part into a liquid product stream and a recirculation stream for use as a motive fluid in the eductor in the case an eductor is used, preferably in which the pump, preferably an eductor, is arranged outside the separation device, preferably below the separation device, and communicates with the separation device;    (2) purified gas stream obtained by the process; and    (3) a process for liquefying the feed gas stream comprising purifying the feed gas stream.    DESCRIPTION OF DRAWING(S) - The figure shows the schematical representation of the process.    Conduit (1)    Joule-Thomson valve (2)    Cryogenic separation device (4)    Slurry level (7)    Heat exchanger (8)