Glycerol (conc. 40-90%) was dehydrated to acrolein and allyl aic. at 280 to 400 degrees C in tab. batch reactor on a solid catalyst. The highest conversion degrees were achieved when SiO2-Al2O3 and H2SO4/SiO2-Al2O3 catalysts were used (0,30 and 0,29 mol/mol to acrolein and 0,282 to 0,220 moll mol to allyl aic. at 300 degrees C, resp.). The mixt. of acrolein and allyl alc. was directly oxidized to acrylic acid at 200-450 degrees C on oxide Mo-V catalyst.