Experimental Determination of the Isotherm at 15°C of the System Mg2+/Cl?, SO42–H2O |
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| Authors: | F Bousmina L Zayani D Ben Hassen-Chehimi N Kbir-Ariguib and M Trabelsi-Ayedi |
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| Institution: | (1) Departamento de Qu?mica–FFCLRP, Universidade de S?o Paulo, Ribeir?o Preto, Brazil;(2) LAFOT–Instituto de Qu?mica, Universidade Federal de Uberl?ndia, Uberl?ndia, Minas Gerais, Brazil;(3) Departamento de Qu?mica, Univeridade Estadual de Maring?, Maring?, Paran?, Brazil;(4) Departamento de Bioqu?mica, Instituto de Qu?mica, Universidade de S?o Paulo, S?o Paulo, Brazil;(5) Instituto de Pesquisa e Desenvolvimento—IP&D, Universidade do Vale do Para?ba—UNIVAP, Av. Shishima Hifumi 2911, Urbanova, CEP: 12244-000 S?o Jos? dos Campos, SP, Brazil; |
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| Abstract: | The diagram of the ternary system Mg2+/Cl−, SO4 2−–H2O was established at 15°C by means of analytical and conductimetric measurements. Three compounds were found in this diagram, which are MgSO4·6H2O, MgSO4·7H2O, and MgCl2·6H2O. The solubility field of MgSO4·7H2O is important whereas those of MgSO4·6H2O and MgCl2·6H2O are small. The compositions (mass-%) of the two invariant points determined by the two methods are: MgSO4:MgCl2=2.73:33.80 and MgSO4: MgCl2=3.38:28.91. Both the measured and the calculated isotherm at 15°C have been used for modelling of the diagram Mg2+/Cl−, SO4 2−–H2O between 0 and 35°C. The polythermal invariant point was approximately located between 15 and 10°C. |
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