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

  • 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

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

Biomass carbohydrates are fractionated very cleanly (>99%) from unreacted insoluble lignin by a dilute acid hydrolysis (0.35-1.5% H 3PO4), wherein the incipient aldoses are intercepted by catalytic hydrogenation (Ru/C) to produce a solution of C5-C 6 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 filtered from the product slurry. This "intercepted dilute acid hydrolysis" (IDAH) of biomass to polyols affords 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.

Original languageEnglish (US)
Pages (from-to)473-483
Number of pages11
JournalBiomass and Bioenergy
Volume26
Issue number5
DOIs
StatePublished - May 2004

All Science Journal Classification (ASJC) codes

  • Forestry
  • Renewable Energy, Sustainability and the Environment
  • Agronomy and Crop Science
  • Waste Management and Disposal

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