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硫醇(甲硫醇或乙硫醇) Mercaptan (methyl mercaptan or ethyl mercaptan) 硫醇是具恶臭的化合物，常用作天然气的加味剂，但过量的硫醇会对人造成损害。Mercaptan is a malodorous compound commonly used as a flavoring agent for natural gas, but excessive mercaptan can cause damage to humans.
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按酸气含量分类Classification by acid gas content 天然气可分为酸性天然气和洁气。Natural gas can be divided into acid gas and clean gas. 酸性天然气sour natural gas 指含有显著量的硫化物和CO2等酸气，这类气体必须经处理后才能达到管输标准或商品气气质指标的天然气。Refers to the natural gas containing significant amounts of sulphide and CO2 and other acid gas, which must be treated before it can reach the standard of pipeline transportation or the quality index of commercial gas. 洁气Clean air 指硫化物和CO2含量甚微或根本不含的气体，它不需净化就可外输和利用。A gas containing little or no sulphide or CO2 that can be transported and used without purification.
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