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Title: Kinetic modeling of hardwood prehydrolysis. Part 1. Xylan removal by water prehydrolysis

The kinetics of xylan removal from quaking aspen, paper birch, American elm, and red maple by water prehydrolysis (autohydrolysis) was reevaluated, and additional data for the water prehydrolysis of southern red oak were obtained. Xylan removal from these hardwood species can be modeled kinetically as the sum of two parallel first-order reactions - one fast and one slow. The rate constant for the fast reaction is highly correlated with the rate constant for the slow reaction for all species studied. The rate constant for initial xylan removal usually reported in the literature is actually a complex function of the rate constants for both the fast and slow reactions and is based solely on the initial data points. This paper presents an improved method for modeling xylan removal that allows modeling throughout the course of its reactions. The reason there are two different rates of xylan removal can be more easily explained on the basis of accessibility rather than any variability in the polymeric structure of the xylan being removed. Thus, the slow rate may be due to a portion of the xylan being embedded within or attached to the lignin via lignin-carbohydrate bonds.
Authors:
Publication Date:
OSTI Identifier:
6655128
Resource Type:
Journal Article
Resource Relation:
Journal Name: Wood Fiber; (United States); Journal Volume: 16:2
Research Org:
Improved Chemical Utilization of Wood, Forest Products Lab, Forest Service, US Dept of Agriculture, Madison, WI 53705
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; WOOD; HYDROLYSIS; XYLANS; REMOVAL; CHEMICAL REACTION KINETICS; MATHEMATICAL MODELS; CARBOHYDRATES; CHEMICAL REACTIONS; DECOMPOSITION; HEMICELLULOSE; KINETICS; LYSIS; ORGANIC COMPOUNDS; POLYSACCHARIDES; REACTION KINETICS; SACCHARIDES; SOLVOLYSIS 090222* -- Alcohol Fuels-- Preparation from Wastes or Biomass-- (1976-1989); 140504 -- Solar Energy Conversion-- Biomass Production & Conversion-- (-1989)