Solubility and Thermodynamic Properties of Sulfamethazine-Saccharin Cocrystal in Pure and Binary (Acetonitrile + 2-Propanol) Solvents  

作　　者：Hongyuan Wei Ningcan Gao Leping Dang 

机构地区：[1]School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China

出　　处：《Transactions of Tianjin University》2021年第6期460-472,共13页天津大学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.21676196).

摘　　要：In this work,a new crystallization method was used to prepare two polymorphs of sulfamethazine-saccharin(SMT-SAC)cocrystal in bulk.The purity and crystal form of both polymorphs were confirmed by optical microscopy,scanning electron microscopy,powder X-ray diff raction,diff erential scanning calorimetry,and thermogravimetric analysis.Moreover,the solubility of the stable form(form Ⅱ)was determined by gravimetric analysis in nine pure solvents and one binary(acetoni-trile+2-propanol)solvent at temperatures ranging from 278.15 to 348.15 K at atmospheric pressure.Experimental data were correlated using the modified Apelblat model,theλh equation,the nonrandom two-liquid(NRTL)model,the Jouyban-Acree model,and the CNIBS/Redlich-Kister model.Finally,the apparent thermodynamic properties,such asΔ_(dis)G,Δ_(dis) H,andΔ_(dis) S,were calculated on the basis of the activity coefficient obtained by the NRTL model.All the models correlate well,and all the experimental and calculated results indicate that the dissolution behavior of SMT-SAC cocrystal form II is a spontaneous,endothermic,and entropy-driven process.

关 键 词：Sulfamethazine-saccharin cocrystal Solid-liquid equilibrium Thermodynamic model Dissolution thermodynamic property 

分 类 号：TQ246[化学工程—有机化工]