Eutectic freeze crystallization simultaneous formation and separation of two solid phases

F. Van Der Ham*, Geert-Jan Witkamp, J. De Graauw, G. M. Van Rosmalen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

Eutectic freeze crystallization (EFC) separates aqueous inorganic solutions into pure water and pure salt. By operating at the eutectic point, ice and salt can be formed simultaneously as two separate phases. Two aqueous systems were investigated in batch and continuous crystallization experiments: copper sulfate (eutectic temperature 271 K) and mono-ammonium phosphate (269 K). Below the eutectic temperature, ice can be formed without any salt formation by seeding with ice seeds and solely salt is formed by seeding with salt crystals. When however, the solution is seeded with both salt and ice crystals, two distinct solid phases are formed: when the stirrer is turned off, ice rises and salt settles. This shows that EFC separates aqueous solutions into ice and salt as two distinct phases. Based on these results, a 151 cooled disk column crystallizer (CDCC) has been built, designed to crystallize and separate both the solids simultaneously in a single apparatus.

Original languageEnglish (US)
Pages (from-to)744-748
Number of pages5
JournalJournal of Crystal Growth
Volume198-199
Issue numberPART I
DOIs
StatePublished - Jan 1 1999

Keywords

  • Aqueous systems
  • CDCC
  • Eutectic freeze crystallization

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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