选用丙烷作溶剂在不同条件下进行超临界溶液快速膨胀（Rapid Expansion of Su-percritical Solution-RESS）制备异丙醇铝超细粒子的实验研究。同时用流动法装置测定了温度为388.15K和403.15K、压力为（21.5～30.5）MPa条件下异丙醇铝在...选用丙烷作溶剂在不同条件下进行超临界溶液快速膨胀（Rapid Expansion of Su-percritical Solution-RESS）制备异丙醇铝超细粒子的实验研究。同时用流动法装置测定了温度为388.15K和403.15K、压力为（21.5～30.5）MPa条件下异丙醇铝在超临界丙烷中的溶解度,并对其进行了关联计算。展开更多
The pore size distribution(PSD)measured by the gas bubble point(GBP)method ofceramic microfiltration(MF)membranes prepared by suspension technique was found to be signifi-cantly influenced by the membrane thickness.A ...The pore size distribution(PSD)measured by the gas bubble point(GBP)method ofceramic microfiltration(MF)membranes prepared by suspension technique was found to be signifi-cantly influenced by the membrane thickness.A culm-like model for pore structure was introduced tocharacterize the membrane pores instead of the conventional model which does not reflect the radiusvariation along the pore passages and is unable to explain the thickness effect on the membrane PSD.A laminate structure,taking the culm-like model for pore structure into consideration,was hypoth-esized for ceramic MF membranes.A mathematical model was then established to quantitativelydescribe the relationship between the membrane number PSD and the membrane thickness.Goodresults were obtained for the correlation of mean pore size and simulation of the PSD for ceramicMF membranes.展开更多
1 INTRODUCTIONSince the days when Soave [1] and Peng and Robinson [2] disclosed their modifiedvan der Waals(vdW)equations of state(EOS),a large number of papers on the samesubject have been published.All vdW type EOS ...1 INTRODUCTIONSince the days when Soave [1] and Peng and Robinson [2] disclosed their modifiedvan der Waals(vdW)equations of state(EOS),a large number of papers on the samesubject have been published.All vdW type EOS are similar in structure,as they are de-rived from a generalized equation [3].Therefore,studies on vdW EOS are essentially fo-cused on the searching of the most rational parameters and the most appropriaterepresentation of these parameters.Although a lot of efforts were paid on this subject展开更多
Peng-Robinson equation of state（PR EOS）was chosen for modeling the thermodynamic be-havior of supercritical（SC）-CO<sub>2</sub>/Solid systems.The necessary critical constants and acentric factorof the s...Peng-Robinson equation of state（PR EOS）was chosen for modeling the thermodynamic be-havior of supercritical（SC）-CO<sub>2</sub>/Solid systems.The necessary critical constants and acentric factorof the solute were obtained by the Sigmund and Trebble（1992）method based on the molecular weightand boiling temperature,and the vapor pressure of the solute was calculated by its meltingtemperature and heat of fusion.This approach compared very favorably with the conventional corres-ponding state theory,but without using critical constants and vapor pressure of solutes.Four mixingrules were tested for the calculation of solid solubility in SC-CO<sub>2</sub>.van der Waals（vdW）mixing rulewith one parameter was considered to be most suitable for the estimation of solubility.A simplecorrelation was developed for the SC-CO<sub>2</sub>/solid binary interaction coefficient k<sub>ij</sub> with the meltingtemperature of pure solutes.The solubilities of solids in SC-CO<sub>2</sub> were estimated for eleven binarysystems at various temperatures,the total absolute展开更多
文摘选用丙烷作溶剂在不同条件下进行超临界溶液快速膨胀（Rapid Expansion of Su-percritical Solution-RESS）制备异丙醇铝超细粒子的实验研究。同时用流动法装置测定了温度为388.15K和403.15K、压力为（21.5～30.5）MPa条件下异丙醇铝在超临界丙烷中的溶解度,并对其进行了关联计算。
基金Supported by the National Natural Science Foundation of China.
文摘The pore size distribution(PSD)measured by the gas bubble point(GBP)method ofceramic microfiltration(MF)membranes prepared by suspension technique was found to be signifi-cantly influenced by the membrane thickness.A culm-like model for pore structure was introduced tocharacterize the membrane pores instead of the conventional model which does not reflect the radiusvariation along the pore passages and is unable to explain the thickness effect on the membrane PSD.A laminate structure,taking the culm-like model for pore structure into consideration,was hypoth-esized for ceramic MF membranes.A mathematical model was then established to quantitativelydescribe the relationship between the membrane number PSD and the membrane thickness.Goodresults were obtained for the correlation of mean pore size and simulation of the PSD for ceramicMF membranes.
基金This work was financially supported by the National Petrochemical Company of China.
文摘1 INTRODUCTIONSince the days when Soave [1] and Peng and Robinson [2] disclosed their modifiedvan der Waals(vdW)equations of state(EOS),a large number of papers on the samesubject have been published.All vdW type EOS are similar in structure,as they are de-rived from a generalized equation [3].Therefore,studies on vdW EOS are essentially fo-cused on the searching of the most rational parameters and the most appropriaterepresentation of these parameters.Although a lot of efforts were paid on this subject
基金Supported by the National Natural Science Foundation of China and Natural Science Foundation of Jiangsu Province.
文摘Peng-Robinson equation of state（PR EOS）was chosen for modeling the thermodynamic be-havior of supercritical（SC）-CO<sub>2</sub>/Solid systems.The necessary critical constants and acentric factorof the solute were obtained by the Sigmund and Trebble（1992）method based on the molecular weightand boiling temperature,and the vapor pressure of the solute was calculated by its meltingtemperature and heat of fusion.This approach compared very favorably with the conventional corres-ponding state theory,but without using critical constants and vapor pressure of solutes.Four mixingrules were tested for the calculation of solid solubility in SC-CO<sub>2</sub>.van der Waals（vdW）mixing rulewith one parameter was considered to be most suitable for the estimation of solubility.A simplecorrelation was developed for the SC-CO<sub>2</sub>/solid binary interaction coefficient k<sub>ij</sub> with the meltingtemperature of pure solutes.The solubilities of solids in SC-CO<sub>2</sub> were estimated for eleven binarysystems at various temperatures,the total absolute
