煤液化油窄馏分临界性质的研究(Ⅱ)假临界压力 - -(Ⅱ) -

为考察石油馏分假临界压力的经验关联式对神华煤液化油窄馏分的适用性,对神华煤液化油300℃之前馏分进行实沸点实验,切割成8个窄馏分,利用基团贡献法计算得到110~200℃馏分的假临界压力计算值随着蒸馏温度的升高而增大,200~300℃馏分的假临界压力随着蒸馏温度的升高而减小。采用不同计算关联式得到的窄馏分假临界压力与基团贡献法计算值相比较,由周佩正推荐式得到的假临界压力计算结果优于其他关联式,除150~180、180~200和220~240℃馏分外,其他馏分的假临界压力计算值与基团贡献法计算值的相对误差都在5%之内。 In order to investigate the applicability of pseudo-critical pressure(PCP) empirical correlation in Shenhua coal-derived oil which was obtained from the continuous direct coal liquefaction test,eight narrow fractions were gained by the true boiling point distillation from the samples,of which boiling point was lower than 300 ℃.The PCP calculated by group contribution method(GCM) ascend with distillation temperature rising between 110 ℃ and 200 ℃ fractions,while the PCP descend between 200 ℃ and 300 ℃ fractions.The PCP calculated by different equations were compared with values by GCM,and the results of the ZHOU Peizheng equation were better than else equations with relative error within 5%,excepting 150 ℃ to 180 ℃,180 ℃ to 200 ℃ and 220 ℃ to 240 ℃ fractions