【Daily Question】Chemical Analysis Edition, 2021.5.19
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The indicator for evaluating the low-temperature flowability of diesel is ( ). A. Freezing point and cloud point B. Solidification point and cold filtration point C. Crystallization point and cold filtration point D. Solidification point and pour point B
The main indicators for evaluating the low-temperature flowability of diesel are the freezing point and cold filter plugging point. (1) Freezing point: Petroleum products are complex mixtures of various hydrocarbons; at low temperatures, they gradually lose their fluidity, and there is no fixed freezing temperature. (2) Cold filter point: Under specified conditions, the highest temperature at which a diesel sample fails to pass 20 ml through a filter within 60 seconds is called the cold filter point, expressed in °C (in whole multiples of 1°C).