为探索不同批次活性炭对参芪扶正稀释液中指标成分的吸附规律,本文首先建立了腺嘌呤、腺苷、毛蕊异黄酮苷、黄芪甲苷等四种指标成分含量的HPLC检测方法,并进行了方法学考察。结果表明腺嘌呤、腺苷、毛蕊异黄酮苷、黄芪甲苷分别在2.5~15 ...为探索不同批次活性炭对参芪扶正稀释液中指标成分的吸附规律,本文首先建立了腺嘌呤、腺苷、毛蕊异黄酮苷、黄芪甲苷等四种指标成分含量的HPLC检测方法,并进行了方法学考察。结果表明腺嘌呤、腺苷、毛蕊异黄酮苷、黄芪甲苷分别在2.5~15 µg/mL、5~30 µg/mL、5~30 µg/mL、0.1~0.8 mg/mL范围内线性关系良好。吸附动力学实验研究结果表明,不同批次活性炭吸附速率及平衡吸附量均存在较大差异。另外采用拟一级动力学和拟二级动力学对活性炭吸附过程进行建模,发现拟二级动力学能更好地拟合活性炭吸附过程。 To explore the adsorption law of different batches of activated carbon on the indicative constituents in the dilution of Shenqi Fuzheng Diluent, HPLC method for the detection of the content of four indicative constituents, including adenine, adenosine, calycosin 7-o-glucoside, and astragaloside A, was established, and the methodology was evaluated. The results showed that adenine, adenosine, calycosin 7-o-glucoside, and astragaloside A had a good linear relationship in the ranges of 2.5~15 μg/mL, 5~30 μg/mL, 5~30 μg/mL and 0.1~0.8 mg/mL, respectively. The results of adsorption kinetic experiments showed that there were great differences in the adsorption rate and equilibrium adsorption amount of different batches of activated carbon. In addition, the activated carbon adsorption process was modeled by pseudo-first-order kinetics and quasi-second-order kinetics, and it was found that the quasi-second-order kinetics could better fit the activated carbon adsorption process.展开更多
To get high purity caprolactam is a challenging task in the chemical fiber industry. To date, reports on the prediction of the distribution of caprolactam and its derivative chemicals have been few. In this study, the...To get high purity caprolactam is a challenging task in the chemical fiber industry. To date, reports on the prediction of the distribution of caprolactam and its derivative chemicals have been few. In this study, the extraction of caprolactam with toluene as the extractant and N-methyl caprolactam with benzene and toluene as theextractants has been camed out. By defining new UNIFAC groups and calibrating related interaction parameters, aUNIFAC method was introduced to predict the equilibrium concentration of caprolactam and methyl caprolactam intoluene or benzene extraction processes. The calculated results fit very well With the experimental data. Using theUNIFAC model, the selectivity of extractants can be predicted.展开更多
Experimental data on the solubility of D-glucose,D-fructose and sucrose in the mixed solvents com-posed of water and ethanol from 273.2 to 293.2 K were determined.The solubility of D-glucose,D-fructose and sucrose dec...Experimental data on the solubility of D-glucose,D-fructose and sucrose in the mixed solvents com-posed of water and ethanol from 273.2 to 293.2 K were determined.The solubility of D-glucose,D-fructose and sucrose decreased as the ethanol content increased in the mixed solvent.The solubility of D-glucose,D-fructose and sucrose decreased with decreasing equilibrium temperature.The modified UNIQUAC model,S-UNIFAC model and mS-UNIFAC model were applied to predict the solid-liquid equilibria.The prediction results were compared and discussed.Better prediction accuracy was generated using the modified UNIQUAC model.展开更多
Mixed solvent of 1-octanol and cyclohexane with 60% （by mass） 1-octanol content was selected as a new extractant for caprolactam extraction. Compared with benzene or toluene, the new extractant has larger extraction...Mixed solvent of 1-octanol and cyclohexane with 60% （by mass） 1-octanol content was selected as a new extractant for caprolactam extraction. Compared with benzene or toluene, the new extractant has larger extraction capacity and much lower toxicity. Although the extraction capacity of the new extractant is smaller than that of pure 1-octanol, 1-octanol solubility of the new extractant in aqueous phase is much smaller. Because of its physical properties of lower density, lower viscosity, and higher interfacial tension, the new extractant performed much better phase separation ability than pure 1-octanol. The new extractant showed certain selectivity when dealing with lactam oil. The mixed solvent of 1-octanol and cyclohexane with 60% （by mass） 1-octanol content is a promising extractant for caprolactam extraction.展开更多
An extended liquid-liquid equilibrium(LLE) UNIFAC model is proposed to describe phase equilibria of mixtures containing caprolactam.In this model,caprolactam is introduced as a new group.New group interaction paramete...An extended liquid-liquid equilibrium(LLE) UNIFAC model is proposed to describe phase equilibria of mixtures containing caprolactam.In this model,caprolactam is introduced as a new group.New group interaction parameters are calibrated from 156 sets of liquid-liquid equilibrium data.The present model gives satisfactory correlation and prediction in liquid-liquid equilibrium,including quaternary systems containing the mixed solvent of an alcohol and an alkane.The model can be applied to predict caprolactam solubility in water and benzene accurately.Freezing point and vapor-liquid equilibrium of binary systems containing caprolactam are also predicted with the extended LLE UNIFAC model.Satisfactory prediction results are obtained.展开更多
文摘为探索不同批次活性炭对参芪扶正稀释液中指标成分的吸附规律,本文首先建立了腺嘌呤、腺苷、毛蕊异黄酮苷、黄芪甲苷等四种指标成分含量的HPLC检测方法,并进行了方法学考察。结果表明腺嘌呤、腺苷、毛蕊异黄酮苷、黄芪甲苷分别在2.5~15 µg/mL、5~30 µg/mL、5~30 µg/mL、0.1~0.8 mg/mL范围内线性关系良好。吸附动力学实验研究结果表明,不同批次活性炭吸附速率及平衡吸附量均存在较大差异。另外采用拟一级动力学和拟二级动力学对活性炭吸附过程进行建模,发现拟二级动力学能更好地拟合活性炭吸附过程。 To explore the adsorption law of different batches of activated carbon on the indicative constituents in the dilution of Shenqi Fuzheng Diluent, HPLC method for the detection of the content of four indicative constituents, including adenine, adenosine, calycosin 7-o-glucoside, and astragaloside A, was established, and the methodology was evaluated. The results showed that adenine, adenosine, calycosin 7-o-glucoside, and astragaloside A had a good linear relationship in the ranges of 2.5~15 μg/mL, 5~30 μg/mL, 5~30 μg/mL and 0.1~0.8 mg/mL, respectively. The results of adsorption kinetic experiments showed that there were great differences in the adsorption rate and equilibrium adsorption amount of different batches of activated carbon. In addition, the activated carbon adsorption process was modeled by pseudo-first-order kinetics and quasi-second-order kinetics, and it was found that the quasi-second-order kinetics could better fit the activated carbon adsorption process.
基金Supported by the National Natural Science Foundation of China （No.20490200, No.20525622）.
文摘To get high purity caprolactam is a challenging task in the chemical fiber industry. To date, reports on the prediction of the distribution of caprolactam and its derivative chemicals have been few. In this study, the extraction of caprolactam with toluene as the extractant and N-methyl caprolactam with benzene and toluene as theextractants has been camed out. By defining new UNIFAC groups and calibrating related interaction parameters, aUNIFAC method was introduced to predict the equilibrium concentration of caprolactam and methyl caprolactam intoluene or benzene extraction processes. The calculated results fit very well With the experimental data. Using theUNIFAC model, the selectivity of extractants can be predicted.
基金Supported by the National Science and Technology Major Project （2009ZX09313-036） the China Postdoctoral Science Foundation （20090461360） the Zhejiang Provincial Education Department Projects （Y200907556）
文摘Experimental data on the solubility of D-glucose,D-fructose and sucrose in the mixed solvents com-posed of water and ethanol from 273.2 to 293.2 K were determined.The solubility of D-glucose,D-fructose and sucrose decreased as the ethanol content increased in the mixed solvent.The solubility of D-glucose,D-fructose and sucrose decreased with decreasing equilibrium temperature.The modified UNIQUAC model,S-UNIFAC model and mS-UNIFAC model were applied to predict the solid-liquid equilibria.The prediction results were compared and discussed.Better prediction accuracy was generated using the modified UNIQUAC model.
基金Supported by the National Natural Science Foundation of China （20490200, 20525622） and the National Basic Research Program of China （2007CB714302）.
文摘Mixed solvent of 1-octanol and cyclohexane with 60% （by mass） 1-octanol content was selected as a new extractant for caprolactam extraction. Compared with benzene or toluene, the new extractant has larger extraction capacity and much lower toxicity. Although the extraction capacity of the new extractant is smaller than that of pure 1-octanol, 1-octanol solubility of the new extractant in aqueous phase is much smaller. Because of its physical properties of lower density, lower viscosity, and higher interfacial tension, the new extractant performed much better phase separation ability than pure 1-octanol. The new extractant showed certain selectivity when dealing with lactam oil. The mixed solvent of 1-octanol and cyclohexane with 60% （by mass） 1-octanol content is a promising extractant for caprolactam extraction.
基金Supported by the National Natural Science Foundation of China（20490200 20525622） the National Basic Research Program of China（2007CB714302）
文摘An extended liquid-liquid equilibrium(LLE) UNIFAC model is proposed to describe phase equilibria of mixtures containing caprolactam.In this model,caprolactam is introduced as a new group.New group interaction parameters are calibrated from 156 sets of liquid-liquid equilibrium data.The present model gives satisfactory correlation and prediction in liquid-liquid equilibrium,including quaternary systems containing the mixed solvent of an alcohol and an alkane.The model can be applied to predict caprolactam solubility in water and benzene accurately.Freezing point and vapor-liquid equilibrium of binary systems containing caprolactam are also predicted with the extended LLE UNIFAC model.Satisfactory prediction results are obtained.
