【Daily Question No. 256】November 3, 2020
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【Daily Question No. 256】November 3, 2020: The lower the boiling point of a petroleum product, the easier it is for it to catch fire on its own. True or False ( ) Please respond within two days.
Error analysis: 1. The flash point and ignition point are related to the vaporization properties of the oil, while the autoignition point is related to the oxidation properties of the oil. Heavy distillates have large molecules and high boiling points, making them difficult to evaporate; as a result, they have high flash points and ignition points. The heavier the fraction, the easier it is to oxidize, so its autoignition point is lower. 2. Since alkanes are prone to oxidation, oils with a high content of alkanes have a lower auto-ignition point. 3. Because among hydrocarbons of the same type, the smaller the molecular weight, the less likely they are to oxidize. 4. Because n-alkanes are more easily oxidized than isomeric alkanes and cycloalkanes.