The production of pure NaCl by the antisolvent crystallisation of NaCl · 2H2O and a consecutive recrystallisation step

T. G. Zijlema*, R. J.A.J. Hollman, Geert-Jan Witkamp, G. M. Van Rosmalen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

NaCl · 2H2O crystals formed by antisolvent crystallisation with N,N-dimethylisopropylamine (DMiPA), were recrystallised batchwise into NaCl at 0.2°C and 0.5°C in pure brines and in brines containing 5 wt% DMiPA. In all experiments the recrystallisation brought about a strong purification of the solid phase. The average DMiPA concentration in the NaCl · 2H2O crystals was approximately 1000 ppm, whereas the DMiPA concentration in the NaCl product was between 1 and 6 ppm. Both the DMiPA concentration in the mother liquor and the recrystallisation temperature influenced the average NaCl crystal size and the rate at which the recrystallisation took place significantly.

Original languageEnglish (US)
Pages (from-to)789-795
Number of pages7
JournalJournal of Crystal Growth
Volume198-199
Issue numberPART I
DOIs
StatePublished - Jan 1 1999

Keywords

  • Antisolvent
  • Impurity
  • N,N-dimethylisopropylamine
  • Purification
  • Recrystallisation
  • Sodium chloride

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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