Abstract: Laboratory-scale experiments were carried out to evaluate the influences of operational parameters on the melt crystallization efficiency for p-cresol purification. The optimal crystallization conditions were determined: dynamic pulsed aeration at 90 L•h?1 and the cooling rate of 0.6-0.8 °C•min?1, followed by sweating at 0.2-0.3 °C•min?1 for 40 min. Results also demonstrate that the melt crystallization efficiency is sensitive to feed concentration, which highlights this technology for separation and purification of high purity products.

Key words: melt crystallization, p-cresol, crystal separation degree, sweating, cooling rate

摘要： Laboratory-scale experiments were carried out to evaluate the influences of operational parameters on the melt crystallization efficiency for p-cresol purification. The optimal crystallization conditions were determined: dynamic pulsed aeration at 90 L•h?1 and the cooling rate of 0.6-0.8 °C•min?1, followed by sweating at 0.2-0.3 °C•min?1 for 40 min. Results also demonstrate that the melt crystallization efficiency is sensitive to feed concentration, which highlights this technology for separation and purification of high purity products.

关键词: melt crystallization, p-cresol, crystal separation degree, sweating, cooling rate