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Catalyst reuse: product distribution of etherification of glycerol with propylene, in four sequential catalytic runs reusing Amberlyst-15 with acidity measurement [glycerol : propylene = 1 : 4, catalyst 10 wt% based on glycerol, temp 100°C, 48 h]. The data are shown as the mean ± 2.39 SD derived from 3 independent samples.
