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液化石油气是指在较高压力或较低温度下呈液体状态,在常温常压下极易气化的石油液体。工业上使用的部分商品丙烷和商品丁烷属于液化石油气。它们是含有不同比例混合的饱和的和极少量不饱和的C_3及C_4,并混有少量轻的和重的烃类,烃类蒸气为饱和或接近饱和状态。我国商品丙烷一般只要求C_4≤2.5％,C_2不予控制,用38℃以下饱和蒸气压来控制指标。商品丁烷要求C_5≤2％,也用38℃饱和蒸气压来控制指标。民用液化气为C_3、C_4混合气体。
Liquefied petroleum gas refers to a liquid that is liquid at a higher pressure or at a lower temperature and is easily gasified at normal temperature and pressure. Some commercial products used propane and commercial butane are liquefied petroleum gas. They are mixed with different proportions of saturated and very small amount of unsaturated C_3 and C_4, and mixed with a small amount of light and heavy hydrocarbons, hydrocarbon vapor saturation or near saturation. China’s commodity propane generally only requires C_4 ≤ 2.5%, C_2 does not control, with saturated vapor pressure below 38 ℃ to control the index. Commodity butane requirements C_5 ≤ 2%, but also with 38 ℃ saturated vapor pressure to control the indicator. Civil liquefied gas is C_3, C_4 mixed gas.