Purification of monoethylene glycol by melt crystallization

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