基于PR状态方程,结合四种不同混合规则,利用Heidemann和Khalil的临界性质计算方法,关联了二十一种不同二元体系的临界温度并预测了其临界压力,其中包括非极性、极性和缔合三类体系。对临界温度的关联结果表明,四种混合规则对所有体系均...基于PR状态方程,结合四种不同混合规则,利用Heidemann和Khalil的临界性质计算方法,关联了二十一种不同二元体系的临界温度并预测了其临界压力,其中包括非极性、极性和缔合三类体系。对临界温度的关联结果表明,四种混合规则对所有体系均适用。对临界压力的预测结果表明,四种混合规则中van der Waals-1及Panagiotopoulos-Reid混合规则对非极性-极性(四偶极)体系的估算精度高,而van der Waals-2和Sadus van derWaals-2混合规则更适用于非极性-非极性体系及极性-极性(四偶极)体系。对于缔合体系,随着组分缔合能力的增强,四种混合规则的预测误差均增大,除含1-丁醇及苯组分的体系外有待于寻找更合适的状态方程及混合规则。展开更多
Critical temperature and pressure of 24 wide and narrow fractions from Talimu crude were determined with the semi-sealed tube apparatus. Based on these experimental data, the applicability of six empirical correlation...Critical temperature and pressure of 24 wide and narrow fractions from Talimu crude were determined with the semi-sealed tube apparatus. Based on these experimental data, the applicability of six empirical correlations for calculating critical properties of Talimu oil fractions were investigated. The average relative error is 1.35%～2.09% for critical temperature and 7.06%～9.96% for critical pressure. Among these correlations, Sim-Daubert and Lee-Kesler correlations are better for critical temperature calculation and better result for critical pressure calculation was obtained by Sim-Daubert correlation, while others are not satisfactory.展开更多
A space design for the molecule of hydrocarbon based on the traditional group division method is developed, and a group vector space method (GVSM) for estimating critical property of hydrocarbon is proposed by using t...A space design for the molecule of hydrocarbon based on the traditional group division method is developed, and a group vector space method (GVSM) for estimating critical property of hydrocarbon is proposed by using the module index of the group vector to characterize the group position in the molecule. Expressions for estimating critical properties T_c,p_c and V_c of hydrocarbons are proposed, with the numerical values of relative group parameters presented. The average percentage deviations of T_c,p_c and V_c estimation are 0.62, 2.3 and 1.6 respectively.展开更多
文摘基于PR状态方程,结合四种不同混合规则,利用Heidemann和Khalil的临界性质计算方法,关联了二十一种不同二元体系的临界温度并预测了其临界压力,其中包括非极性、极性和缔合三类体系。对临界温度的关联结果表明,四种混合规则对所有体系均适用。对临界压力的预测结果表明,四种混合规则中van der Waals-1及Panagiotopoulos-Reid混合规则对非极性-极性(四偶极)体系的估算精度高,而van der Waals-2和Sadus van derWaals-2混合规则更适用于非极性-非极性体系及极性-极性(四偶极)体系。对于缔合体系,随着组分缔合能力的增强,四种混合规则的预测误差均增大,除含1-丁醇及苯组分的体系外有待于寻找更合适的状态方程及混合规则。
文摘Critical temperature and pressure of 24 wide and narrow fractions from Talimu crude were determined with the semi-sealed tube apparatus. Based on these experimental data, the applicability of six empirical correlations for calculating critical properties of Talimu oil fractions were investigated. The average relative error is 1.35%～2.09% for critical temperature and 7.06%～9.96% for critical pressure. Among these correlations, Sim-Daubert and Lee-Kesler correlations are better for critical temperature calculation and better result for critical pressure calculation was obtained by Sim-Daubert correlation, while others are not satisfactory.
文摘A space design for the molecule of hydrocarbon based on the traditional group division method is developed, and a group vector space method (GVSM) for estimating critical property of hydrocarbon is proposed by using the module index of the group vector to characterize the group position in the molecule. Expressions for estimating critical properties T_c,p_c and V_c of hydrocarbons are proposed, with the numerical values of relative group parameters presented. The average percentage deviations of T_c,p_c and V_c estimation are 0.62, 2.3 and 1.6 respectively.
