Low-temperature chemical glycerolysis to produce diacylglycerols by heterogeneous base catalyst

摘要

The present study aimed to develop a heterogeneous catalysis process for diacylglycerols (DAG) production through low-temperature chemical glycerolysis. Of the heterogeneous catalysts evaluated, MgO-supported KOH (KOH-MgO) was found effective for the low-temperature chemical glycerolysis, and the KOH-MgO was characterized by FT-IR and powder XRD. Reaction temperature was of paramount importance and 80°C was found necessary to enhance the present reaction. Molar ratio of oil to glycerol at stoichiometric ratio (2:1) gave more DAG formation. 41.8 ± 0.8 wt% of DAG was obtained under these conditions: KOH-MgO concentration 4.5 wt% based on oil, acetone dosage 3:1 (acetone to oil in weight ratio), molar ratio of oil to glycerol 2:1, reaction temperature 80°C and time 12 h.