Catalytic hydrogenolysis of alditols

Details Catalytic hydrogenolysis of alditols Catalytic hydrogenolysis of alditols

C - Chemistry, Metallurgy

07

C

260/633.5, 260/6

C07C 31/18 (2006.01) C07C 29/00 (2006.01)

Patent

CA 1191870

ABSTRACT Alditols such as 15-40 W % sorbitol solution in water are catalytically hydrocracked in a fixed bed reaction process using a high activity nickel catalyst to produce at least about 30 W % conversion to glycerol and glycol products. The feedstream pH is controlled to prevent catalyst damage by adding a basic promoter material such as calcium hydroxide Reaction zone conditions are maintained at 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 rege- nerated to provide a catalyst age of 8-200 hours. The reaction products are separated in a recovery step, and any alditols can be recycled to the reaction zone for further hydrogenolysis to produce 40-90 W % glycerol product. Sorbitol conversion is maintained preferably at between about 30-70 W % by catalyst regeneration following 10 to 50 hours use, comprising washing with solvent to remove deposits and by heating the catalyst with reducing gas at 500-600°F temperature and at reduced pressure to remove surface oxidation.

389943

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