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nature : generally refers from oil fields, gas or oil refineries of a carbon carbon to the four hydrocarbon gas mixture. Hydrogen can contain and above the C5 hydrocarbons, and may contain impurities such as sulfides. According to sources can be broadly divided into : (a) Natural gas cylinders, such as gas and oil fields associated gas; (2) oil-product processing gas, refinery gas; (3) Liquid petroleum products pyrolysis gas (a gas main). According components can be divided into : (a) lean gas (dry gas), containing two smaller amount of carbon hydrocarbons, methane and hydrogen content more; (2) rich gas (or Humidity) contain a relatively large number of more than two carbon hydrocarbons, methane and hydrogen content less. Separation generally can be divided into : (a) absorption distillation, LPG by absorbent hopes of a recovery over the carbon components after the resumption, after distillation generated from the various hydrocarbon and absorbent recycling, recycling; (2) or deep frozen condensate distillation, by the depth of frozen LPG, hopes of a recovery over the carbon components on into liquid and then derived by the distillation of various hydrocarbons. (3) the mobile-bed adsorption or absorption, LPG by moving bed adsorption separation and then derived by distillation important raw materials for manufacture of synthetic solvents, synthetic resin, synthetic plastics, synthetic rubber and synthetic ammonia gas and other raw materials.
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