Three calculational models, statistical associating fluid theory (SAFT), modified SAFT, and Boublík Alder Chen Kreglewshi (BACK) are compared for supercritical CO 2 C 2H 5OH using a set of van der Waals ...Three calculational models, statistical associating fluid theory (SAFT), modified SAFT, and Boublík Alder Chen Kreglewshi (BACK) are compared for supercritical CO 2 C 2H 5OH using a set of van der Waals type mixing rules for both the BACK equation of state (EOS) and the SAFT EOS. Equations are presented for the residual Helmholtz free energy, residual chemical potentials, and compressibilty factor for mixtures. A comparison with experimental vapor liquid equilibrium (VLE) data reveals that the BACK EOS together with the suggested mixing rules provides more accurate prediction of the binary system than the SAFT or the modified SAFT model with no adjustable binary parameters. The correlation results are improved with an adjustable parameter. 展开更多
The statistical associating fluid theory (SAFT) Boublík Alder Chen Kreglewshi(BACK) equation of state is employed to correlate vapor liquid equilibria of 16 binary mixtures composed of supercritical fluid...The statistical associating fluid theory (SAFT) Boublík Alder Chen Kreglewshi(BACK) equation of state is employed to correlate vapor liquid equilibria of 16 binary mixtures composed of supercritical fluids with other fluids at elevated pressures. The van der Waals mixing rules are used and the binary parameters are adjusted to experimental data. The SAFT BACK equation of state provides a better correlation of vapor liquid equilibrium than the original BACK equation. Consequently, the binary parameters computed from the data sets can be used to accurately predict the saturated densities of the vapor and liquid phases. 展开更多
The description using an analytic equation of state of thermodynamic properties near the critical points of fluids and their mixtures remains a challenging problem in the area of chemical engineering. Based on the sta...The description using an analytic equation of state of thermodynamic properties near the critical points of fluids and their mixtures remains a challenging problem in the area of chemical engineering. Based on the statistical associating fluid theory across the critical point (SAFT-CP), an analytic equation of state is established in this work for non-polar mixtures. With two binary parameters, this equation of state can be used to calculate not only vapor-liquid equilibria but also critical properties of binary non-polar alkane mixtures with acceptable deviations.展开更多
考察了疏水缔合聚合物HAWP-18溶液的稳态流变性能及十二烷基硫酸钠（SDS）和烷基酚聚氧乙烯醚（OP-10）对HAWP-18溶液的影响。并以HAWP-18和十二烷基硫酸钠（SDS）制备了一种压裂液HAWP-18M,评价了其相关性质。结果表明：HAWP-18溶液的...考察了疏水缔合聚合物HAWP-18溶液的稳态流变性能及十二烷基硫酸钠（SDS）和烷基酚聚氧乙烯醚（OP-10）对HAWP-18溶液的影响。并以HAWP-18和十二烷基硫酸钠（SDS）制备了一种压裂液HAWP-18M,评价了其相关性质。结果表明：HAWP-18溶液的表观黏度随着剪切速率的增加而下降,随后基本保持不变。HAWP-18M压裂液具有较好的耐温耐剪切性能,在90℃、170 s-1的条件下连续剪切90 min,黏度仍能保持在50m Pa·s以上。HAWP-18M压裂液的储能模量（G＇）和损耗模量（G″）基本不受应力变化影响,并且G＇〉G″,说明HAWP-18M压裂液具有黏弹性并且以弹性行为为主。HAWP-18M压裂液触变性优于羟丙基胍胶（HPG）压裂液。HAWP-18M压裂液静态悬砂性能较好,在砂比（砂占压裂液的体积分数,下同）40%条件下,砂子的沉降速率为8.2×10^-4mm/s。在HAWP-18M压裂液中加入过硫酸铵破胶剂,80℃下,1 h内即可破胶,破胶液黏度在5m Pa·s以下,表面张力为25.14 m N/m,与航空煤油的界面张力为0.56 m N/m。展开更多
文摘Three calculational models, statistical associating fluid theory (SAFT), modified SAFT, and Boublík Alder Chen Kreglewshi (BACK) are compared for supercritical CO 2 C 2H 5OH using a set of van der Waals type mixing rules for both the BACK equation of state (EOS) and the SAFT EOS. Equations are presented for the residual Helmholtz free energy, residual chemical potentials, and compressibilty factor for mixtures. A comparison with experimental vapor liquid equilibrium (VLE) data reveals that the BACK EOS together with the suggested mixing rules provides more accurate prediction of the binary system than the SAFT or the modified SAFT model with no adjustable binary parameters. The correlation results are improved with an adjustable parameter.
文摘The statistical associating fluid theory (SAFT) Boublík Alder Chen Kreglewshi(BACK) equation of state is employed to correlate vapor liquid equilibria of 16 binary mixtures composed of supercritical fluids with other fluids at elevated pressures. The van der Waals mixing rules are used and the binary parameters are adjusted to experimental data. The SAFT BACK equation of state provides a better correlation of vapor liquid equilibrium than the original BACK equation. Consequently, the binary parameters computed from the data sets can be used to accurately predict the saturated densities of the vapor and liquid phases.
文摘The description using an analytic equation of state of thermodynamic properties near the critical points of fluids and their mixtures remains a challenging problem in the area of chemical engineering. Based on the statistical associating fluid theory across the critical point (SAFT-CP), an analytic equation of state is established in this work for non-polar mixtures. With two binary parameters, this equation of state can be used to calculate not only vapor-liquid equilibria but also critical properties of binary non-polar alkane mixtures with acceptable deviations.
文摘考察了疏水缔合聚合物HAWP-18溶液的稳态流变性能及十二烷基硫酸钠（SDS）和烷基酚聚氧乙烯醚（OP-10）对HAWP-18溶液的影响。并以HAWP-18和十二烷基硫酸钠（SDS）制备了一种压裂液HAWP-18M,评价了其相关性质。结果表明：HAWP-18溶液的表观黏度随着剪切速率的增加而下降,随后基本保持不变。HAWP-18M压裂液具有较好的耐温耐剪切性能,在90℃、170 s-1的条件下连续剪切90 min,黏度仍能保持在50m Pa·s以上。HAWP-18M压裂液的储能模量（G＇）和损耗模量（G″）基本不受应力变化影响,并且G＇〉G″,说明HAWP-18M压裂液具有黏弹性并且以弹性行为为主。HAWP-18M压裂液触变性优于羟丙基胍胶（HPG）压裂液。HAWP-18M压裂液静态悬砂性能较好,在砂比（砂占压裂液的体积分数,下同）40%条件下,砂子的沉降速率为8.2×10^-4mm/s。在HAWP-18M压裂液中加入过硫酸铵破胶剂,80℃下,1 h内即可破胶,破胶液黏度在5m Pa·s以下,表面张力为25.14 m N/m,与航空煤油的界面张力为0.56 m N/m。
