苯或甲苯萃取己内酰胺和甲基己内酰胺分配系数的测定和预测

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 ex-traction of caprolactam with toluene as the extractant and N-methyl caprolactam with benzene and toluene as the extractants has been carried out. By defining new UNIFAC groups and calibrating related interaction parameters, a UNIFAC method was introduced to predict the equilibrium concentration of caprolactam and methyl caprolactam in toluene or benzene extraction processes. The calculated results fit very well with the experimental data. Using the UNIFAC model, the selectivity of extractants can be predicted.     

苯或甲苯萃取己内酰胺和甲基己内酰胺分配系数的测定和预测

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.     

273.2K至293.2K之间D-葡萄糖、D-果糖和蔗糖在乙醇和水的混合溶剂中的固液平衡

Experimental data on the solubility of D-glucose, D-fructose and sucrose in the mixed solvents composed 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.     

新型己内酰胺萃取剂的筛选和评价

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.     

溶剂微胶囊--现代萃取技术发展的核心之一

从溶剂微胶囊的制备及应用两方面较为全面地综述了溶剂微胶囊技术的发展,并总结了其特点,提出技术展望。溶剂微胶囊技术是微胶囊技术与萃取技术相结合而发展起来的新型分离技术,溶剂微胶囊具有萃淋树脂可以有效避免乳化和分相容易等优点,而在萃取剂包覆量和防止萃取剂流失方面,具有更明显的优势。     

UNIFAC模型法计算含己内酰胺体系的相平衡(英文)

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.     

273.2K至293.2K之间D-葡萄糖、D-果糖和蔗糖在乙醇和水的混合溶剂中的固液平衡

Experimental data on the solubility of D-glucose, D-fructose and sucrose in the mixed solvents composed 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.