【作者】 毛梅芳；

【导师】 顾正桂；

【作者基本信息】 南京师范大学 ， 应用化学， 2004， 硕士

【摘要】 本文综述了国内外有关糠醛与水分离的各种方法。在前人研究的基础上，进一步探讨和研究，选择合适的萃取剂(三氯乙烯)，提出用液液萃取和精馏结合的方法分离糠醛与水，并进一步提纯糠醛。 详细测定了搅拌时间、搅拌速度、静置时间和温度等因素对液液平衡的影响，在此基础上，测定了糠醛-水、三氯乙烯-水二元体系及糠醛-水-三氯乙烯三元体系液液平衡数据，采用最小方差法关联UNIQUAC、NRTL模型中的模型参数并用Newton-Rapson法关联二元及三元液液平衡分离结果，模拟结果表明：UNIQUAC模型关联误差较小。 考察了溶剂比、搅拌速度、原料浓度及萃取级数等因素对错流及逆流萃取的影响，改进并设计了新型的逆流萃取小试塔，进行了错流和逆流萃取实验；以UNIQUANC方程为平衡模型，分别采用相分配系数法和逐板计算法模拟计算错流和逆流萃取结果，实验结果和关联结果误差较小。 本文为进一步研究糠醛和水分离及工业化生产提供了详细的基础数据，所研究的分离糠醛和水的液液萃取法不仅适用于糠醛精制，还适用于造纸废水中糠醛的回收。更多还原

【Abstract】 The recent methods of separating furfural from its aqueous solution were reviewed in this paper. Some new research and discussion were carried out on the basis of the predecessors, Thus an advanced method of liquid-liquid extraction combined with distillation to separate furfural from its aqueous solution and the simulation calculation of the process were put forward by the selection of a proper extraction solvent (trichloroethylene).Different influencing factors on the liquid-liquid equilibrium such as stirring time, stirring velocity, settling time and temperature etc. were studied in detail, on the base of which the liquid-liquid equilibrium data of furfural-water, trichloroethylene-water and furfural-water- trichloroethylene system were tested, and the interaction parameters of UNIQUAC and NRTL equation were correlated by minimalization Square method, thus the binary and ternary LLE data were simulated. The results showed that UNIQUAC equation has the minor deviation.Multi-plate counter-flow extraction tower and the liquid-liquid equilibrium pot were designed. Experiments of counter-flow extraction and cross-current extraction were conducted, considering influencing factors such as solvent ratio,stirring velocity, raw material concentration and extraction plates. The results of the simulation by the methods of Phase Partition Coefficient and Plate-by -plate Calculation were compared with experiment, which showed a minor deviation, it was proved that the simulation result can predict precisely the experiment result. Fundamental references were provided for further study on separation of furfural and water and the industrialization . the Liquid-liquid extraction method could be used not only in the purification of furfural, but also in the recovering of furfural from industrial papermaking waste water.更多还原