TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The first condition includes a temperature of 190-250 (preferably 200-230) degrees C and a pressure within a range from 0.05-1.2 (preferably 0.1-0.3) bar. The step (d) is performed under a second condition that is in favor of formation of propylene glycol. The second condition includes a temperature within a range from 140-220 (preferably 160-200) degrees C and a pressure of 1.2-500 (preferably 2-30) bar. Acetol is separated from at least one component selected from ethylene glycol and propylene glycol in step (c). The acetol subjected to the reaction of step (d) is free from ethylene glycol. At least 70 (preferably 90) wt.% of ethylene glycol present in the first reaction product is removed from the acetol. The acetol is separated from hydrogen and water in step (c). The separated hydrogen and water are recycled. The process further involves a step (e) where the second reaction product is separated from other components present in the second reaction product. Acetol is separated from propylene glycol in step (e). Preferred Components: The second reaction product comprises propylene glycol. More than 50 (preferably 80) wt.% of the second reaction product is propylene glycol. The first condition is in favor of formation of acetol. The molar ratio of hydrogen to glycerol is 1-1000 (preferably 1.2-15 or 0.1). EXAMPLE - Glycerol (36.8 g) was reacted in the presence of copper chromium catalyst in two steps to form a mixture containing propylene glycol. In first step, relatively pure acetol (23.7 g) was isolated from glycerol in absence of hydrogen at a reaction pressure of 98 kPa, where reaction time was 1.5 hours at 220 degrees C and 3 hours at 240 degrees C. In second step, the acetol from first step was further reacted in presence of hydrogen to provide propylene glycol (4.3 g) at 1400 kPa hydrogen over pressure using similar catalyst that was used for the formation of acetol. The catalyst used in the first step was used in the condition in which they arrived and the catalyst used in the second step was reduced in presence of hydrogen at 300 degrees C for 4 hours prior to the reaction to give propylene glycol.