Eutectic freeze crystallization from the ternary Na2CO3-NaHCO3-H2O system. A novel scraped wall crystallizer for the recovery of soda from an industrial aqueous stream

J. Van Spronsen*, M. Rodriguez Pascual, F. E. Genceli, D. O. Trambitas, H. Evers, Geert-Jan Witkamp

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Eutectic freeze crystallization was tested in a scaled up version of a scraped cooled wall crystallizer on an industrial aqueous sodium carbonate-sodium bicarbonate waste stream containing traces of molybdenum. A heat transfer rate of 5kWm-2 was maintained in the crystallizer. Sodium carbonate decahydrate with molybdenum content below 1ppm and pure ice were produced by continuous crystallization at -3.8°C by operating within the metastable zone width of bicarbonate. At -4.0°C bicarbonate started to co-crystallize. The bimodal size distribution of the mixture resulted in poor filtration and purity of the salt product.

Original languageEnglish (US)
Pages (from-to)1259-1263
Number of pages5
JournalChemical Engineering Research and Design
Volume88
Issue number9
DOIs
StatePublished - Sep 1 2010

Keywords

  • Crystallization
  • Downstream processing
  • Multiphase reactors
  • Precipitation
  • Process control
  • Scale-up

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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