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Green Synthesis of Double Long-Chain Diglycerol Diacetal and Its Application as Lubricating Base Oil
- Li, Xu, Chen, Li, Wu, Lan, Xu, Hong, Dong, Jinxiang
- The journal of the American Oil Chemists' Society 2017 v.94 no.10 pp. 1301-1311
- catalysts, friction, gas chromatography-mass spectrometry, isomers, lubricants, oils, solvents
- Dehydration acetalization of diglycerol with lauraldehyde in the presence of homogeneous acid catalysts using water as solvent has been studied. The prepared double long-chain diglycerol diacetal was identified as a mixture of six regioisomers by GC and GC-MS. p-Dodecylbenzenesulfonic acid exhibited excellent activity for this acetalization reaction. The reaction parameters with p-dodecylbenzenesulfonic acid catalyst were subsequently optimized in terms of the yield and isomer distribution of diglycerol diacetal. Under the optimum operating conditions, the yield of diglycerol diacetal reached 93.9%, and the selectivity in terms of the distribution of the six regioisomers was found to be in proportions of 24:36:18:11:3:8. Furthermore, the tribological performance of diglycerol diacetal has been evaluated as a potential lubricant base oil by means of an Optimol SRV-V oscillating reciprocating friction and wear tester. The tribological test results revealed that diglycerol diacetal displayed superior lubrication properties compared to the commonly used poly-alpha-olefin (PAO 8).