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石油是复杂化合物的混合物,没有固定的凝点。在由液态转变为固态时,只是由一种聚集态转向另一种聚集态。转化过程有一个稠化阶段,凝点温度模糊不清,不能真正表示凝固点的温度,只是凝固时的温度范围,是一种条件数据,不是一般的物理常数。试验方法规定为将盛有试管内的试油冷却并倾斜45度角,经过1分钟试油停止流动时的最高温度。凝点是柴油在低温下倒装、发放和贮运时的重要质量指标。柴油低温下失去流动性的原因:一是粘度增大.含蜡很少或不含蜡的油品,当温度降低时,粘度增大到一定程度便失去了流动性。二是石蜡形成晶体网(骨架)。板状和针状结晶互相络合,将低凝点的组份吸附,使其失去流动性。对于纯粹物质都有固定的凝固点,测定中都显示温度停滞不变的情况.温度停滞不变的原因,与固相形成并同时放出熔化热有直接
Petroleum is a complex mixture of compounds, there is no fixed freezing point. In the transition from the liquid state to the solid state, only one state of aggregation shifts to another state of aggregation. The conversion process has a thickening stage, the freezing point temperature fuzzy, can not really represent the freezing point temperature, but the freezing temperature range is a condition data, not the general physical constants. The test method stipulates that the maximum temperature at which the test oil in the test tube is cooled and tilted at a 45 degree angle will stop the flow of test oil after 1 minute. The freezing point is the important quality index when diesel is flipped, distributed and stored at low temperature. The reasons for the loss of fluidity at low temperature in diesel are as follows: First, the viscosity increases, oil with little or no wax will lose its fluidity when its viscosity increases to a certain extent when the temperature is lowered. The second is the formation of crystalline wax network (skeleton). Plate-like and needle-like crystals complex with each other, the low pour point component adsorption, loss of mobility. For pure matter have a fixed freezing point, the measurement showed that the temperature stagnation of the same reason for the temperature stagnation, and the formation of solid phase with the release of heat of fusion at the same time direct