Natural-gas processing is a complex industrial process designed to clean raw naturalgas by separating impurities and various non-methane hydrocarbons and fluids toproduce what is known as pipeline quality dry natural gas.[1]Natural-gas processing begins at the well head. The composition of the raw natural gasextracted fromproducing wells depends on the type depth and location of theunderground deposit and the geology of the area. !il and natural gas are often foundtogetherinthesamereservoir.Thenatural gasproducedfromoil wellsisgenerallyclassified as associated-dissolved meaning that the naturalgas is associated with ordissolved in crude oil. Natural gas production absent any association with crude oil isclassifiedas"non-associated.# $n%&&' ()percent of *.+. wellheadproductionofnatural gas was non-associated.[%],ost natural gas extracted from the -arth contains to varying degrees low molecularweight hydrocarbon compounds. examplesincludemethane /01'2 ethane /0%132 propane /04152 and butane /0'11&2. 6henbrought to the surface and processed into purified finished by-products all of these arecollectively referred to N78 /Natural 7as 8i9uids2. The natural gas extracted from coalreservoirs and mines /coalbed methane2 is the primary exception being essentially amix of mostly methane and about 1& percent carbon dioxide /0!%2.Natural-gas processing plants purify raw natural gas extracted /a2 fromunderground gasfields or/b2at thesurfacefromfluidsproducedbyoil wells.: fullyoperationalplant deliverspipeline-9uality drynaturalgasthatcan be usedas fuel byresidential commercial and industrial consumers. ;lant processes removecontaminants. the N78 hydrocarbons part of the contaminants are recovered for othercommercialuses.