K2SO4 production via the double decomposition reaction of KCl and phosphogypsum

Samir I. Abu-Eishah, Ali A. Bani-Kananeh, Mamdouh A. Allawzi

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


The production of potassium sulfate from phosphogypsum and potassium chloride in the presence of ammonia and isopropanol has been investigated. The solubility of phosphogypsum in aqueous solutions of KCl, HCl, and mixtures of both has been first measured at various temperatures and concentrations. The factors affecting the conversion of potassium chloride to potassium sulfate, such as aqueous ammonia to phosphogypsum ratio, weight percent of isopropanol in the solution, weight percent excess phosphogypsum, and reaction temperature and pressure have also been investigated. The optimum reaction conditions obtained at 25°C and atmospheric pressure have been 50% excess phosphogypsum, 4.32 ammonia solution to phosphogypsum ratio, and aqueous solutions containing initial concentrations of 33 wt.% ammonia and 7 wt.% isopropanol. The maximum conversion of KCl to K2SO4 obtained under these conditions was 97.2%. (C) 2000 Elsevier Science S.A. All rights reserved.

Original languageEnglish
Pages (from-to)197-207
Number of pages11
JournalChemical Engineering Journal
Issue number3
Publication statusPublished - Mar 15 2000
Externally publishedYes


  • Double decomposition
  • KSO production
  • Phosphogypsum process
  • Phosphogypsum solubility

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering


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