Evaporative crystallization of anhydrous sodium carbonate at atmospheric conditions

Harald Oosterhof*, Geert Jan Witkamp, Gerda M. Van Rosmalen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


A new process for the production of superdense anhydrous soda ash uses a mixture of water and a high-boiling second solvent to lower the transition point at which anhydrous (Na2CO3) and monohydrous sodium (Na2CO3·H2O) carbonate are in equilibrium to below the atmospheric boiling point. The stable conditions for anhydrate were first established by measuring the water activiiy in saturated mixtures of water and ethylene glycol. With the results, fed-batch evaporative crystallization experiments were carried out. Both the water activity and the crystallization measurements showed that anhydrous soda was stable in boiling mixtures containing more than 22.5 wt. % ethylene glycol (on a sah-free basis). A subsequent continuous evaporative crystallization experiment produced anhydrous soda ash with a bulk density of 1,550 kg/m3, which is substantially higher than that of any other atmospherically crystallized soda.

Original languageEnglish (US)
Pages (from-to)2220-2225
Number of pages6
JournalAIChE Journal
Issue number10
StatePublished - Oct 2001
Externally publishedYes

ASJC Scopus subject areas

  • General Chemical Engineering
  • Biotechnology
  • Environmental Engineering


Dive into the research topics of 'Evaporative crystallization of anhydrous sodium carbonate at atmospheric conditions'. Together they form a unique fingerprint.

Cite this