石油馏分恒压比热容与焓的研究

STUDY ON ISOBARIC SPECIFIC HEAT CAPACITY AND ENTHALPY OF PETROLEUM CUTS

用差示扫描量热计（ＤＳＣ）测定５个国产原油馏分在系列温度下的恒压比热容，给出比热容与温度的关联式。经标准物质αＡｌ２Ｏ３和正庚烷的恒压比热容测定表明，与文献数据的平均偏差在±２％以内。由恒压比热容计算馏分在相应温度下的焓，与落入式铜量热计直接量热所得的结果比较，符合良好。还考察８个恒压比热容计算方法对这些馏分的适用性。

Isobaric specific heat capacities of 5 petroleum cuts from Chinese crudes were measured at different temperatures with a differential scanning calorimeter (DSC), which was tested by the specific heat capacity determination of the standard substances of αAl 2O 3 and nheptane with the average deviation of less than ±2% in comparison with the literature data The correlations of the isobaric specific heat capacity against the temperature were presented and the enthalpies at the corresponding temperature for all the petroleum cuts were calculated The enthalpy data were in good agreement with those measured by a dropping copperblock calorimeter The application to the isobaric specific heat capacity estimation of 8 correlations in the literatures was investigated