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The use of catalytic hydrogenation to intercept carbohydrates in a dilute acid hydrolysis of biomass to effect a clean separation from lignin

✍ Scribed by J. Michael Robinson; Caroline E. Burgess; Melissa A. Bently; Chris D. Brasher; Bruce O. Horne; Danny M. Lillard; José M. Macias; Hari D. Mandal; Samuel C. Mills; Kevin D. O'Hara; Justin T. Pon; Annette F. Raigoza; Ernesto H. Sanchez; José S. Villarreal

Publisher
Elsevier Science
Year
2004
Tongue
English
Weight
355 KB
Volume
26
Category
Article
ISSN
0961-9534

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✦ Synopsis

Biomass carbohydrates are fractionated very cleanly (¿ 99%) from unreacted insoluble lignin by a dilute acid hydrolysis (0.35 -1.5% H3PO4), wherein the incipient aldoses are intercepted by catalytic hydrogenation (Ru/C) to produce a solution of C5-C6 polyols (xylitol, sorbitol) and anhydro polyols (sorbitan) in which no phenols could be detected (¡ 100 ppm). A screen removes granular catalyst and lignin is simply ÿltered from the product slurry. This "intercepted dilute acid hydrolysis" (IDAH) of biomass to polyols a ords high conversion for a variety of biomass types within 3-6 h at ∼ 185 • C. Minimum polyols cost (not including catalyst cost) is calculated to range from $0.055 -$0:070 kg -1 . Polyols, rather than aldoses, are required for subsequent chemical conversion into hydrocarbon fuels.

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