中文摘要：

为了得到咔唑溶液结晶的合适溶剂,采用液固平衡法测定了咔唑在N,N-二甲基甲酰胺（DMF）、二甲苯（xylene）、四氯乙烯（TCE）、二乙二醇二甲醚（DGDE）等4种溶剂中的溶解度,并分别采用修正的Apelblat模型、van′t Hoff方程和λh方程对实验数据进行了关联。结果表明：咔唑在4种溶剂中的溶解度均随温度的升高而增大,由于溶质和溶剂间相互作用力不同,咔唑的溶解度存在较大差异,按照DMF,DGDE,xylene,TCE的顺序依次递减;3种溶解度模型的关联系数R2均在0.99左右,其中λh方程优于修正的Apelblat模型,van′t Hoff方程中得到的热力学数据表明咔唑在上述4种溶剂中的溶解均为非自发吸热过程。

英文摘要：

The solubilities of carbazole were determined in four organic solvents, N, N-dimethyl for- mamide, xylene, tetrachloroethylene, and diethylene glycol dimethyl ether using a self-made liquid-solid equilibrium equipment. The solubility data were correlated by the modified Apelblat model, van＇t Hoff equation and ah equation, separately. The results show that the solubility of carbazole in four investiga- ted solvents increased with increasing temperature, a big discrepancy of solubility was found in different solvents because of the different interaction between solute and solvent. The solubility data decreased in the order of DMF, DGDE, xylene, TCE. The calculated solubility data of the modified Apelblat model, van＇t Hoff equation and ）,h equation showed a good agreement with the experimental data. Moreover, the results of ）,h equation are much better than those of modified Apelblat model. The thermodynamic parameters gained from van＇t Hoff equation indicate that the dissolution process was endothermic and non-spontaneous.