Eutectic freeze crystallization with an aqueous KNO3-HNO 3 solution in a 100-L cooled-disk column crystallizer

Raymond Vaessen, Marcelo Seckler, Geert Jan Witkamp*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Eutectic freeze crystallization is a novel technique for processing waste and process streams of aqueous electrolyte solutions, separating them into pure water and pure solid salt. A dedicated apparatus, a 100-L cooled-disk column crystallizer, has been developed and tested, combining crystallization and solid/solid separation of ice and salt. Experiments have been performed with a ternary system of aqueous KNO3-HNO3. Heat-transfer rates were achieved in the range of 1300-4600 W·m-2·K -1, which are related to the square root of the scraping rate. The ice product slurry contained 0.15 wt % salt. The ice impurity content after three washing cycles was as low as 15 ppm K+. Well-faceted KNO 3 crystals are produced with high purity.

Original languageEnglish (US)
Pages (from-to)4874-4880
Number of pages7
JournalIndustrial and Engineering Chemistry Research
Volume42
Issue number20
StatePublished - Oct 1 2003
Externally publishedYes

ASJC Scopus subject areas

  • Polymers and Plastics
  • Environmental Science(all)
  • Chemical Engineering (miscellaneous)

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