Multi-stage catalytic conversion of aldoses to alditols

Details Multi-stage catalytic conversion of aldoses to alditols Multi-stage catalytic conversion of aldoses to alditols

1981-04-27

1984-02-21

Gerstl, Robert

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

Organic compounds

Oxygen containing

C07H 100

Patent

active

044331843

ABSTRACT:
Monosaccharides, such as glucose-water solution, are catalytically hydrogenated by being passed through multiple reaction zones connected in series and each containing a high-activity supported nickel catalyst to produce 99.8 W % overall conversion to an alditol solution such as sorbitol. The pH of liquid in each reaction zone is controlled to between 4.5 and 7 by adding an alkali solution such as sodium hydroxide to the feed to prevent acid leaching of catalyst metal and to help maintain catalyst activity therein. Reaction zone conditions used are 130.degree.-180.degree. C. temperature, 500-2000 psig hydrogen partial pressure, and a ratio of hydrogen gas/feed liquid within the range of about 500-5000. Feedstream liquid space velocity is maintained within range of 0.5-16 V.sub.f /Hr/V.sub.c, with higher space velocities being used for achieving lower incremental conversion desired in the subsequent reaction zones to help maintain pH of the effluent liquid within the desired range. The first reactor is preferably a back-mixed ebullated-catalyst-bed type to achieve 60-80 W % incremental conversion, the last reactor is a fixed-catalyst-bed type to achieve 5-20 W % incremental conversion, and three catalytic reaction zones are preferred.

REFERENCES:
patent: 2650941 (1953-09-01), Koome et al.
patent: 3329729 (1967-07-01), Brundner et al.
patent: 4258222 (1981-03-01), Mohring
patent: 4322569 (1982-03-01), Chao et al.

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