Multi-stage aldoses to polyols process

Details Multi-stage aldoses to polyols process Multi-stage aldoses to polyols process

C - Chemistry, Metallurgy

07

C

260/632.2

C07C 31/18 (2006.01) C07C 29/00 (2006.01) C07C 29/141 (2006.01) C07C 31/26 (2006.01)

Patent

CA 1208240

ABSTRACT Aldoses such as glucose solution are catalytically hydrogenated in a multiple-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 98 W % conversion to alditol such as sorbitol solution. The resulting alditols such as 15-40 W % sorbitol solu- tion in water are catalytically hydrocracked in a second-stage fixed-bed reaction zone preferably using a high-activity nickel catalyst to produce at least about 30 W % conversion 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 The reaction products are separated in a recovery step, and unconverted heavy alditol feed can be diluted and 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 containing unconverted sugars is passed to a third-stage catalytic reaction zone for further conversion to alditols and polyols.

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