燃料馏分油气－液相平衡常数的测定与关联

实沸点蒸馏原油获得燃料馏分油。采用拟静态法测定不同沸程的22种燃料馏分油在系列温度下的泡点蒸气压，用Antoine方程关联蒸气压与温度的关系。在泡点压力分别为10 kPa、30 kPa、50 kPa、80 kPa和101.325 kPa时，按虚拟组分处理法计算了燃料宽馏分油中各虚拟组分的气-液相平衡常数，关联了气-液相平衡常数与虚拟组分的沸点以及相平衡温度、压力的关系，得到的表达式可以计算常压沸点范围在348.15 K至623.15 K间燃料宽馏分油的气-液相平衡常数，经180个数据点回归检验，平均误差为4.5%。

MEASUREMENT AND CORRELATION OF VAPOR-LIQUID PHASE EQUILIBRIUM CONSTANT FOR FUEL FRACTIONS

Bubble-point vapor pressures along with the coefficients of Antoine equation correlation were reported for 22 hydrocarbon fuel fractions with different true boiling temperature ranges to investigate the relationship of vapor-liquid phase equilibrium constants between wide and narrow fuel fractions. The fuel samples were originated from crude oils with the initial atmospheric boiling temperature from 348.15 K to 623.15 K. The vapor pressures at the range from about 8 kPa to 101.3 kPa were measured by using a specially designed inclined ebulliometer with a pump-like stirrer on the basis of the principle of quasi-static method. On the basis of a wide fuel fraction assumed to be composed of several pseudo components (narrow fuel fractions with the boiling temperature range of 25 K), the vapor-liquid phase equilibrium constants of different pseudo components at different bubble-point conditions were calculated. The VLE constants were also correlated with the boiling temperatures of the pseudo components, the phase equilibrium temperature and pressure. A generalized equation was obtained with an overall absolute average deviation of 4.5% from the experimental values tested by 180 datum points at the pressure range from 8 kPa to 101.3 kPa and the normal boiling temperature range of fuels from 348.15 K to 623.15 K, which can give reasonably satisfactory results in engineering calculation.