Purification of monoethylene glycol by melt crystallization

M. Ila, M. Louhi-Kultanen*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)
131 Downloads (Pure)

Abstract

Separation of glycols with close boiling points and relatively high viscosity at their melting point is a challenge in the production of high purity products downstream of biorefinery processes. In this work, the efficiency of the layer melt crystallization process with acetone as the assisting solvent was evaluated for a mixture of monoethylene glycol and 1,2-pentanediol. Solid-liquid equilibrium was measured and modelled with the NRTL and modified UNIFAC group-contribution models to evaluate the thermodynamic driving force of crystallization. Layer melt crystallization was conducted to determine the effect of solvent composition on purity, distribution coefficient of impurity, crystal growth rate, and yield at different operating conditions. Addition of the solvent altered the thermodynamics and kinetics of crystallization, thereby altering the purity level of the final product. An effective distribution coefficient of impurity between 0.1 and 0.6 in one-step crystallization was obtained, depending on the solvent composition and the applied operating conditions.

Original languageEnglish
Article number118601
Number of pages8
JournalChemical Engineering Science
Volume272
Early online date14 Mar 2023
DOIs
Publication statusPublished - 15 May 2023
MoE publication typeA1 Journal article-refereed

Keywords

  • Assisting solvent
  • Melt crystallization
  • Purification
  • Thermodynamics

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