Ethanol Antisolvent Effects on Solid–Liquid Equilibrium and Nucleation of Ammonium Magnesium Sulfate Hexahydrate.
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| Title: | Ethanol Antisolvent Effects on Solid–Liquid Equilibrium and Nucleation of Ammonium Magnesium Sulfate Hexahydrate. |
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| Authors: | Le, Tam Minh1 (AUTHOR) tamlm@hcmute.edu.vn, Ta, Duc Hong2 (AUTHOR), Pham, Binh Phuc1 (AUTHOR), Hua, Son Loc1 (AUTHOR) |
| Source: | Chemical Engineering & Technology. Jun2025, Vol. 48 Issue 6, p1-10. 10p. |
| Subjects: | Ethanol, Solid-liquid equilibrium, Magnesium sulfate, Solvents, Nucleation, Thermal analysis, X-ray diffraction, Dissolution (Chemistry) |
| Abstract: | The characterization of a double salt synthesized from aqueous solutions of ammonium sulfate and magnesium sulfate is reported. Thermal analysis indicates that the resulting crystals incorporate six water molecules, yielding a compound with the composition (NH4)2Mg(SO4)2·6H2O. X‐ray diffraction confirms the structural stability of the crystals in both water and ethanol–water mixtures. Two key aspects were investigated, including the thermodynamics of the solid–liquid equilibrium (SLE) and the kinetics of primary nucleation. SLE measurements reveal that ethanol acts as an antisolvent. The dissolution process is endothermic, with the enthalpy of dissolution increasing with ethanol content. The enthalpy of dissolution in a solvent containing 10 % (w/w) of ethanol is +21.92 kJ mol−1, compared to +17.14 kJ mol−1 in water. Furthermore, the nucleation process follows second‐order kinetics, with the nucleation rate constant exhibiting a strong dependence on solvent composition. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | The characterization of a double salt synthesized from aqueous solutions of ammonium sulfate and magnesium sulfate is reported. Thermal analysis indicates that the resulting crystals incorporate six water molecules, yielding a compound with the composition (NH4)2Mg(SO4)2·6H2O. X‐ray diffraction confirms the structural stability of the crystals in both water and ethanol–water mixtures. Two key aspects were investigated, including the thermodynamics of the solid–liquid equilibrium (SLE) and the kinetics of primary nucleation. SLE measurements reveal that ethanol acts as an antisolvent. The dissolution process is endothermic, with the enthalpy of dissolution increasing with ethanol content. The enthalpy of dissolution in a solvent containing 10 % (w/w) of ethanol is +21.92 kJ mol−1, compared to +17.14 kJ mol−1 in water. Furthermore, the nucleation process follows second‐order kinetics, with the nucleation rate constant exhibiting a strong dependence on solvent composition. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 09307516 |
| DOI: | 10.1002/ceat.70040 |
