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© The Author(s) 2013. Published by Science and Education Publishing. Table 6. Optimized conditions for etherification reaction conditions obtained from DOE Parameters Value Reaction time (h) 8.29 Reaction temperature (°C) 250 Catalyst amount (wt. %) 2.51 Predicted Diglycerol yield (%) 44.7 Experimental 47.8 Error (%) Diglycerol yield 6.5 Zahra Gholami et al. Selective Etherification of Glycerol over Heterogeneous Mixed Oxide Catalyst: Optimization of Reaction Parameters. Chemical Engineering and Science, 2013, Vol. 1, No. 4, 79-86. doi:10.12691/ces-1-4-6 © The Author(s) 2013. Published by Science and Education Publishing.