Solubility and metastable zone width measurement of 2,4-diaminobenzenesulfonic acid in (H2SO4 + H2O) system

[Display omitted] The equilibrium solubility of 2,4-diaminobenzenesulfonic acid and super solubility as well as metastable zone width were measured in (H2SO4 + H2O) system by the laser dynamic method at elevate temperature range from 298.15 K to 338.15 K. 2,4-Diaminobenzenesulfonic acid solubility d...

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Bibliographic Details
Published inChinese journal of chemical engineering Vol. 44; no. 4; pp. 384 - 391
Main Authors Shen, Fanfan, Chen, Lizhen, Lian, Pengbao, Wang, Jianlong, Cao, Duanlin
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.04.2022
School of Chemical Engineering and Technology,North University of China,Taiyuan 030051,China
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Summary:[Display omitted] The equilibrium solubility of 2,4-diaminobenzenesulfonic acid and super solubility as well as metastable zone width were measured in (H2SO4 + H2O) system by the laser dynamic method at elevate temperature range from 298.15 K to 338.15 K. 2,4-Diaminobenzenesulfonic acid solubility dependence on the temperature and solvent composition were correlated by the modified Apelblat equation, (CNIBS)/Redlich-Kister model and Jouyban-Acree model. The correlated results by three correlation models were in good accord with the experimental values according to relative average deviations (RD), root-mean-square deviations (RMSD), and correlation coefficients (R2). The metastable zone width increased with temperature and sulfuric acid content. The dissolution enthalpy, dissolution entropy and the Gibbs energy were calculated from the experimental values, which indicated that dissolution process of the 2,4-diaminobenzenesulfonic acid was endothermic. The solubility and calculation models of 2,4-diaminobenzenesulfonic acid in (sulfuric acid + water) system could provide the basic data to the crystallization and purifying of the 2,4-diaminobenzenesulfonic acid.
ISSN:1004-9541
2210-321X
DOI:10.1016/j.cjche.2021.04.033