Fig. 5

Conversion of glycerol, TA purity and TA selectivity at various feed locations of acetic acid (A) and unreacted acetic acid in distillate at various feed locations of acetic acid (B) (1 rectifying stage, 30 reactive stages, 1 stripping stage, an acetic acid to glycerol molar feed ratio of 3:1, a reflux ratio of 3:1 and a column pressure of 1 bar).