Size and morphology of benzoic acid crystals produced by drowning-out crystallisation

X. Holmbäck, Å C. Rasmuson

Research output: Contribution to journalArticlepeer-review

Abstract

Benzole acid is crystallised from saturated ethanol-water solutions by adding water or an ethanol-water mixture in semi-batch experiments. The influence of precipitant addition rate, ethanol concentration in the bulk solution and ethanol concentration in the feed, have been studied. The product particles are characterised by microscopic determination of the projected area diameter and the aspect ratio. It is found that benzole acid crystals grown from ethanol-water solutions range from needles to platelets. The mean size ranges from 69 to 218 μm while the aspect ratio varies from 1.3 to 10.2. The influence of process variables on the product size and shape are discussed in terms of the influence of supersaturation and of the solvent composition. By attachment energy modelling, the surface chemistry is examined.

Original languageEnglish
Pages (from-to)780-788
Number of pages9
JournalJournal of Crystal Growth
Volume198-199
Issue numberPART I
DOIs
Publication statusPublished - 1999
Externally publishedYes

Keywords

  • Attachment energy model
  • Drowning-out crystallization
  • Product characteristics
  • Solubility of benzole acid
  • Surface chemistry

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