Two-stage aldoses to polyols process

Details Two-stage aldoses to polyols process Two-stage aldoses to polyols process

C - Chemistry, Metallurgy

07

C

260/632.2

C07C 31/18 (2006.01) B01J 23/755 (2006.01) C07C 29/10 (2006.01) C07C 29/60 (2006.01) C07C 29/80 (2006.01) C07C 31/26 (2006.01)

Patent

CA 1202643

ABSTRACT Aldoses such as glucose solution are catalytically hydrogenated in a two-stage fixed bed reaction process to produce glycerol and other polyol products. The feedstream pH to each reactor is controlled to between about 7 and 14 by adding an alkaline promoter material such as calcium hydroxide. First stage reaction zone conditions are 130-180°C temperature, 500-2000 psig hydrogen partial pressure, and feedstream liquid space velocity is within range of 0.5-3.5 Vf/Hr/Vc. The first reactor uses a high activity nickel catalyst to produce at least about 90 W % conversion to alditol such as sorbitol solution. The resulting alditols such as 15-40 W % sorbitol solution in water, are catalytically hydrocracked in a second stage fixed bed reaction zone preferably using a high acti- vity nickel catalyst to produce at least about 30 W % con- version to glycerol and glycols products. Second stage reaction zone conditions are 420-520°F temperature, 1200-2000 psig hydrogen partial pressure, and liquid hourly space velocity of 1.5 to 3Ø To maintain desired activity and glycerol yield, the catalyst is regenerated to provide catalyst age of 8-200 hours. The reaction products are separated in a recovery step, and unconverted alditol feed is recycled to the second stage reaction zone for further hydrogenolysis to produce 40-90 W % glycerol product. Sorbitol conversion is maintained preferably at between about 30-70 W % and a purge stream portion containing unconverted sugars is recycled to the first stage reaction zone for further conversion to alditols and polyols.

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