Fig. 6

Bottom temperature at various bottom to feed ratio (A) and conversion of glycerol, TA purity, TA selectivity yield and bottom of RD column temperature at various bottom to feed ratio (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).