Aluminum sulphate hydrates thermal decomposition and preparation of different crystalline hydrate phases at elevated temperatures

H. Moselhy, G. Pokol, F. Paulik, M. Arnold, J. Kristof, K. Tomor, S. Gal, E. Pungor

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Abstract

The decomposition of aluminium sulphate hydrate, Al2(SO4)3·18H2O was studied by thermogravimetric analysis (TG, DTD) and a simultaneous thermoanalysis method. The purposes of this study were to reveal intermediate compounds and to determine the stable temperature range of each compounds. Various sample weights and heating rates were used to demonstrate their influence on the results. The quasi-isothermal quasi-isobaric technique was used as a new method to prepare different hydrate phases of aluminum sulphate. Three crystalline hydrate phases, Al2(SO4)3·16H2O Al2(SO4)3·14H2O, Al2(SO4)3·H2O were prepared and the X-ray diffraction patterns of these phases were recorded.

Original languageEnglish
Pages (from-to)595-606
Number of pages12
JournalJournal of thermal analysis
Volume39
Issue number5
Publication statusPublished - May 1 1993

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ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Engineering(all)

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