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Addition of an azeotropic ETBE/ethanol mixture in eurosuper-type gasolines

机译:在欧洲超级型汽油中添加共沸ETBE /乙醇混合物

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This study proposes an azeotropic ETBE/ethanol mixture as a possible oxygenated additive for the formulation of eurosuper-type gasolines. Two eurosuper gasolines with different chemical compositions and well defined characteristics of density, volatility and octane numbers are used. Gasoline formulations containing azeotropic mixtures display an intermediary behavior between that of ETBE (ethyl/erf-butyl ether) and ethanol in gasoline blends. Formulations containing this additive offer advantages over ethanol (low volatility and low solubility in water) and ETBE (higher octane number and lower production cost). Gasolines with azeotropic additives show lower Reid vapor pressures (RVPs) than gasolines formulated with ethanol, and therefore low levels of volatile organic compounds, similarly to highly pure ETBE. The use of the azeotropic mixture containing ethanol (renewable, deriving from biomass) and ETBE (produced from ethanol and isobutene) in its formulation is environmentally attractive in industrialized countries due to the need to reduce carbon dioxide emissions.
机译:这项研究提出了一种共沸的ETBE /乙醇混合物,可以作为欧洲超大型汽油配方的含氧添加剂。使用两种具有不同化学成分和明确定义的密度,挥发性和辛烷值特征的欧洲超级汽油。包含共沸混合物的汽油配方在汽油共混物中的ETBE(乙基/叔丁基醚)和乙醇之间表现出中间行为。含有这种添加剂的配方具有优于乙醇(挥发性低,在水中的溶解度低)和ETBE(辛烷值较高,生产成本较低)的优势。含共沸添加剂的汽油显示的里德蒸气压(RVP)比用乙醇配制的汽油低,因此与高纯ETBE相似,挥发性有机化合物含量低。由于需要减少二氧化碳排放量,因此在工业化国家中使用含有乙醇(可再生,源自生物质)和ETBE(由乙醇和异丁烯生产)的共沸混合物在环境方面具有吸引力。

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