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首页> 外文期刊>International journal of green energy >The Effects of Methanol Fraction on the Azeotropic Behaviors of Methanol/Gasoline Mixtures
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The Effects of Methanol Fraction on the Azeotropic Behaviors of Methanol/Gasoline Mixtures

机译：甲醇馏分对甲醇/汽油混合物共沸行为的影响

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Methanol is regarded as a potential alternative fuel for spark ignition (SI) engine. It is feasible for SI engines to run on methanol/gasoline mixtures. When methanol is mixed with gasoline, the physicochemical properties of the mixtures are changed different from the properties of both methanol and pure gasoline to some extent. This paper focused on the azeotropic behaviors of saturated vapor pressure (p(s)) and the distillation curves of methanol/gasoline mixtures. And compositions of the distillates were identified and quantified by a gas chromatography-mass spectrometry (GC-MS) under various T-d. Experimental results show that the p(s) and distillation curves of methanol/gasoline mixtures showed strong positive deviation of Raoult's law. The maximum deviation occurred around the T-d of methanol's boiling point, i.e., 64.5 degrees C. Increasing the heavy hydrocarbon contents in gasoline could draw the T-d of methanol/gasoline mixtures back to that of base gasoline. C-4-C-8 alkanes, olefins, and benzenes were the main components in distillates of gasoline and its methanol mixture. However, the additive with hetero atom of oxygen, methyl tertiary butyl ether (MTBE) was the leading component with the largest mass percentage in all the distillates, while methanol was another leading component in methanol mixture distillates. Methanol co-boiled with all of the gasoline components rather than with some certain ones; even so, pentane, 2-methyl-2-butene and toluene were the three leading azeotropes with the change ratio of over 4% in mass percentage.
机译：甲醇被认为是火花点火（SI）发动机的潜在替代燃料。 SI发动机在甲醇/汽油混合物上运行是可行的。当甲醇与汽油混合时，混合物的物理化学性质会在一定程度上不同于甲醇和纯汽油的性质。本文着重于饱和蒸气压（p（s））的共沸行为以及甲醇/汽油混合物的蒸馏曲线。并通过气相色谱-质谱（GC-MS）在各种T-d下鉴定和定量馏出物的组成。实验结果表明，甲醇/汽油混合物的p（s）和蒸馏曲线显示出很强的拉乌尔定律正偏差。最大偏差发生在甲醇沸点的T-d附近，即64.5℃。增加汽油中的重烃含量可将甲醇/汽油混合物的T-d拉回到基础汽油的T-d。 C-4-C-8烷烃，烯烃和苯是汽油及其甲醇混合物馏出物中的主要成分。然而，在所有馏出物中，具有氧杂原子的添加剂甲基叔丁基醚（MTBE）是质量百分比最高的主要成分，而甲醇是甲醇混合物馏出物中的另一个主要成分。甲醇与所有汽油成分共沸腾，而不是与某些汽油成分共沸腾；即使如此，戊烷，2-甲基-2-丁烯和甲苯是三个主要的共沸物，其质量百分比的变化率超过4％。

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