Fig. 7
Catalytic dehydration of 3HP to AA. Continuous catalytic dehydration of 8 g/L 3HP (filled traingle) to AA (filled diamond) using a chromatographic column (300 × 7.8 mm) packed with 12 g TiO2 and placed in an oven at 230 °C. The 3HP solution was obtained as a product from glycerol via two-step biotransformation. Pre-heated 3HP solution (pH 5.7) was fed at a rate of 1.5 mL/h using a quantitative pump. The eluate containing AA was condensed in a cold water bath and collected in fractions