在水温（28．5±0．5）℃，pH值7．8～8．65条件下，设置了0、10、20和30等4种盐度，测定了萨罗罗非鱼（Sarotherodon melanotheron）、尼罗罗非鱼（Oreochromis niloticus）和以色列红罗非鱼（Israel red tilapia）的耗氧率、临界...在水温（28．5±0．5）℃，pH值7．8～8．65条件下，设置了0、10、20和30等4种盐度，测定了萨罗罗非鱼（Sarotherodon melanotheron）、尼罗罗非鱼（Oreochromis niloticus）和以色列红罗非鱼（Israel red tilapia）的耗氧率、临界溶氧量、窒息点及抵达临界溶氧量和窒息点时间．实验结果表明：除了在盐度为20时，以色列红罗非鱼耗氧率最低，萨罗罗非鱼次之外，在其他盐度都是尼罗罗非鱼耗氧率最高，以色列红罗非鱼次之，萨罗罗非鱼最低．尼罗罗非鱼和以色列红罗非鱼临界溶氧量、窒息点都随盐度的增加而增加，盐度为30时最高，盐度为0时最低，而且以色列红罗非鱼始终都高于尼罗罗非鱼．萨罗罗非鱼是在盐度为20时最低，在盐度为10时最高．3种罗非鱼都是在盐度为20时，抵达临界溶氧量和窒息点的时间最慢，在盐度为30时抵达临界溶氧量和窒息点的时间最快．展开更多
Phase behavior of paclitaxel in solvent mixtures of dichloromethane and supercritical carbon dioxide was investigated using a supercritical phase monitor.Cloud point pressures were determined as a function of temperat...Phase behavior of paclitaxel in solvent mixtures of dichloromethane and supercritical carbon dioxide was investigated using a supercritical phase monitor.Cloud point pressures were determined as a function of temperature,pressure and paclitaxel content from 313.1 to 343.1K and pressures up to 33.52 MPa.The ternary mixtures exhibit a typical lower critical solution temperature behavior.When paclitaxel content increases,the single-phase region shrinks in size.Three cubic equations of state(Redlich-Kworng,Soave-Redlich-Kwong and Peng-Robinson equation of state) coupled with the van der Waals one-fluid mixing rules were selected to correlate the experimental data.The results indicate that SRK EOS coupled with two binary interaction parameters kij and lij can predict paclitaxel solubility for the best fit of experimental data.展开更多
Vapor-liquid phase equilibrium data including composition,densities,molar volume and equilibrium constant of isobutanol in supercritical carbon dioxide from 313.2K to 353.2K were measured in a variable-volume visual c...Vapor-liquid phase equilibrium data including composition,densities,molar volume and equilibrium constant of isobutanol in supercritical carbon dioxide from 313.2K to 353.2K were measured in a variable-volume visual cell.The properties of critical point were obtained by extrapolation.The results showed that critical temperature,critical pressure and critical compressibility factor of CO2-isobutanol system decreased with the increase of critical CO2 content.The phase equilibrium model was established by Peng-Robinson equation of state and van der Waals-2 mixing regulation,and model parameters were determined by optimization calculation of nonlinear least square method.The correlation between calculated values and the experimental data showed good agreement.展开更多
Some aromatic compounds, phenol, aniline and nitrobenzene, were oxidized in supercritical water. It was experimentally found that the chemical oxygen demand (COD) removal efficiency of these organic compounds can achi...Some aromatic compounds, phenol, aniline and nitrobenzene, were oxidized in supercritical water. It was experimentally found that the chemical oxygen demand (COD) removal efficiency of these organic compounds can achieve a high level more than 90% in a short residence time at temperatures high enough. As temperature, pressure and residence time increase, the COD removal efficiencies of the organic compounds would all increase. It is also found that temperature and residence time offer greater influences on the oxidation process than pressure. The difficulty in oxidizing these three compounds is in the order of nitrobenzene ＞ aniline ＞ Phenol. In addition, it is extremely difficult to oxidize aniline and nitrobenzene to CO2 and H2O at the temperature lower than 873.15 K and 923.15 K, respectively. Only at the temperature higher than 873.15 K and 923.15 K, respectively, the COD removal efficiencies of 90% of aniline and nitrobenzene can be achieved.展开更多
文摘在水温（28．5±0．5）℃，pH值7．8～8．65条件下，设置了0、10、20和30等4种盐度，测定了萨罗罗非鱼（Sarotherodon melanotheron）、尼罗罗非鱼（Oreochromis niloticus）和以色列红罗非鱼（Israel red tilapia）的耗氧率、临界溶氧量、窒息点及抵达临界溶氧量和窒息点时间．实验结果表明：除了在盐度为20时，以色列红罗非鱼耗氧率最低，萨罗罗非鱼次之外，在其他盐度都是尼罗罗非鱼耗氧率最高，以色列红罗非鱼次之，萨罗罗非鱼最低．尼罗罗非鱼和以色列红罗非鱼临界溶氧量、窒息点都随盐度的增加而增加，盐度为30时最高，盐度为0时最低，而且以色列红罗非鱼始终都高于尼罗罗非鱼．萨罗罗非鱼是在盐度为20时最低，在盐度为10时最高．3种罗非鱼都是在盐度为20时，抵达临界溶氧量和窒息点的时间最慢，在盐度为30时抵达临界溶氧量和窒息点的时间最快．
基金Supported by the National Natural Science Foundation of China （21076084 20676046） the Fundamental Research Funds for the Central Universities （2011ZZ0006）
文摘Phase behavior of paclitaxel in solvent mixtures of dichloromethane and supercritical carbon dioxide was investigated using a supercritical phase monitor.Cloud point pressures were determined as a function of temperature,pressure and paclitaxel content from 313.1 to 343.1K and pressures up to 33.52 MPa.The ternary mixtures exhibit a typical lower critical solution temperature behavior.When paclitaxel content increases,the single-phase region shrinks in size.Three cubic equations of state(Redlich-Kworng,Soave-Redlich-Kwong and Peng-Robinson equation of state) coupled with the van der Waals one-fluid mixing rules were selected to correlate the experimental data.The results indicate that SRK EOS coupled with two binary interaction parameters kij and lij can predict paclitaxel solubility for the best fit of experimental data.
文摘Vapor-liquid phase equilibrium data including composition,densities,molar volume and equilibrium constant of isobutanol in supercritical carbon dioxide from 313.2K to 353.2K were measured in a variable-volume visual cell.The properties of critical point were obtained by extrapolation.The results showed that critical temperature,critical pressure and critical compressibility factor of CO2-isobutanol system decreased with the increase of critical CO2 content.The phase equilibrium model was established by Peng-Robinson equation of state and van der Waals-2 mixing regulation,and model parameters were determined by optimization calculation of nonlinear least square method.The correlation between calculated values and the experimental data showed good agreement.
基金the Research Foundation of SINOPEC(No. X596006) and Cao Guangbiao's Advanced Research Foundation of Zhejiang University.
文摘Some aromatic compounds, phenol, aniline and nitrobenzene, were oxidized in supercritical water. It was experimentally found that the chemical oxygen demand (COD) removal efficiency of these organic compounds can achieve a high level more than 90% in a short residence time at temperatures high enough. As temperature, pressure and residence time increase, the COD removal efficiencies of the organic compounds would all increase. It is also found that temperature and residence time offer greater influences on the oxidation process than pressure. The difficulty in oxidizing these three compounds is in the order of nitrobenzene ＞ aniline ＞ Phenol. In addition, it is extremely difficult to oxidize aniline and nitrobenzene to CO2 and H2O at the temperature lower than 873.15 K and 923.15 K, respectively. Only at the temperature higher than 873.15 K and 923.15 K, respectively, the COD removal efficiencies of 90% of aniline and nitrobenzene can be achieved.
