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The extraction of LPG from natural gas is carried out by cryogenic turbo - expander process at all LPG plants of GAIL. In this process, Propane & Butane are extracted from natural gas by cooling it to -55 to -68 ^oC. As natural gas contains heavier components (Pentane, Hexane, Heptane etc.) than Propane & Butane also, whenever natural gas is cooled for the extraction of LPG, these heavier components also get liquefied along with Propane & Butane. LPG is separated from this total liquid by distillation and the balance liquid is called Natural Gasoline Liquid. This NGL is then further processed to manufacture Pentane and Special Boiling Point Solvent.