TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Process: The cooling in step (b) is done by isenthalpic expansion, preferably isenthalpic expansion over an orifice or a valve, especially a Joule-Thomson valve (2), or in which the cooling is done by nearly isentropic expansion, especially by means of an expander, preferably a turbo expander or a laval nozzle, preferably in which the feed gas stream is pre-cooled to 15 to -35 degrees C, preferably 5 to -20 degrees C, before expansion, more, preferably in which the pre-cooling of the feed gas stream is done by heat exchange against a cold fluidum, especially an external refrigerant, e.g. a propane cycle, an ethane/propane cascade or a mixed refrigerant cycle or an internal process loop, suitably a carbon dioxide of hydrogen sulfide stream, or a cold methane stream. The feed gas stream is cooled at -40 to -100 degrees C, preferably -50 to -80 degrees C. In step (f), substantially all the solid contaminants present in the slurry of contaminants are melted. In step (e), the stream comprising liquid phase contaminant or the slurry contaminants stream is introduced into the separation device at a level which is lower than the level at which the methane enriched gaseous phase is removed from the separation device in step (d). Preferred Components: The pump, preferably an eductor, is arranged outside the separation device and communicates with the separation device.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The feed gas stream is a natural gas stream in which the gaseous contaminants are carbon dioxide, hydrogen sulfide and/or at least 2C hydrocarbons. The natural gas stream comprises: 5-40 (preferably 20-35) vol.% of hydrogen sulfide; and 5-90 (preferably 10-75) vol.% of carbon dioxide. The feed gas comprises 0-25 vol.% of at least 2C hydrocarbons, 0-20 vol.% of 2-5C hydrocarbons, 0.3-18 vol.% of 2-4C hydrocarbons, 0.5-15 vol.% of ethane, or 75-100 vol.% of methane. The feed gas stream has a temperature of -20 to 150 degrees C, preferably -10 to 70 degrees C, and a pressure of 10-250 bar, preferably 80-120 bar. EXAMPLE - No suitable example given.