Catalytic hydrogenolysis of alditols to product glycerol and pol

Details Catalytic hydrogenolysis of alditols to product glycerol and pol Catalytic hydrogenolysis of alditols to product glycerol and pol

1981-01-21

1982-12-28

Evans, Joseph E.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C07C 3122, C07C 3120, C07C 3124, C07C 3126

Patent

active

043663320

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 promotor material such as calcium hydroxide. Reaction zone conditions are maintained at 420.degree.-520.degree. F. temperature, 1200-2000 psig hydrogen partial pressure, and liquid hourly space velocity of 1.5 to 3.0. 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 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.degree.-600.degree. F. temperature and at reduced pressure to remove surface oxidation.

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Lang "Handbook of Chemistry", 10th ed. (1961), pp. 951, 952.

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