Diglycerol synthesis via solvent-free selective glycerol etherification process over lithium-modified clay catalyst

作者：Ayoub Muhammad; Abdullah Ahmad Zuhairi^*

来源：Chemical Engineering Journal, 2013, 225: 784-789.

DOI：10.1016/j.cej.2013.04.044

• Montmorillonite K-10
• Lithium
• Glycerol
• Selective etherification
• Diglycerol isomer

Diglycerol was synthesized via solvent free glycerol etherification over solid-base catalyst. Acid-treated montmorillonite K-10 (Clay MK-10) was modified with LiOH (Clay Li/MK-10) through ion-exchange method and characterized using different techniques for surface and structural properties. The parent and modified clay were then used to catalyze the production of diglycerol via solvent free glycerol etherification reaction. The reaction was conducted at 240 degrees C for up to 12 h and the activity of the catalysts was compared with that of homogeneous catalyst (LiOH). High diglycerol selectivity of about 53% was obtained at a glycerol conversion of about 98% with Clay Li/MK-10. The selectivity to alpha beta diglycerol isomer was also increased from 35% to 55% while the selectivity to act isomer was decreased from 65% to 35%.

• 出版日期2013-6-1