Eutectic freeze crystallization in a new apparatus: The cooled disk column crystallizer

Frank van der Ham, Marcelo Martins Seckler, Geert Jan Witkamp*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

Eutectic freeze crystallization (EFC) is a technique for simultaneous crystallization of ice and salt that is energetically more efficient than conventional evaporative crystallization. In this paper, a new type of crystallizer is introduced for simultaneously conducting EFC and separating the ice from the salt crystals, the cooled disk column crystallizer (CDCC). Crystallization is achieved by indirect cooling with wiped disks and separation by means of gravity. The liquid feed stream enters the column at the center, ice leaves the column at the top and salt is discharged at the bottom. The heat flux from bulk fluid to disk in a 14 l CDCC using CuSO4-water as a model system (eutectic temperature -1.6 °C) was 1.9 kW m-2 for a temperature difference between disk and bulk of 4.5 K. The CuSO4 · 5H2O crystals formed were well faceted with an average size of 200 μm. Ice crystals were disk shaped with an average size 150 μm. Both ice and salt crystals were easily filtered. The impurity level in the ice crystals was below 100 ppm Cu.

Original languageEnglish (US)
Pages (from-to)161-167
Number of pages7
JournalChemical Engineering and Processing: Process Intensification
Volume43
Issue number2
DOIs
StatePublished - Jan 1 2004
Externally publishedYes

Keywords

  • Cooled disk column crystallizer
  • Copper sulfate pentahydrate
  • Eutectic freeze crystallization
  • Ice

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Energy Engineering and Power Technology
  • Process Chemistry and Technology
  • Industrial and Manufacturing Engineering

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