Process developments in the acid hydrolysis of cellulose
Thesis/Dissertation
·
OSTI ID:5351500
A continuous countercurrent reactor was designed, constructed and operated to investigate its potential for acid hydrolysis of cellulosic materials. The diffusional influence was found to reduce reactor yield considerably. Therefore, a model was developed to account for the effect of glucose diffusion in the acid hydrolysis of wood chips in a counter current reactor. Fundamental studies were also conducted pertaining to diffusion of glucose through wood chips. Specifically, the effect of prehydrolysis, cellulose acid hydrolysis, temperature and the grain direction were investigated. The diffusivity was found to be a strong function of temperature and extent of cellulose conversion. It was correlated to the absolute temperature by an Arrhenius type of equation. Diffusivity was found to increase rapidly after 40-60% conversion of cellulose. The diffusional influence was analyzed quantitatively in terms of Thiele modulus and Effectiveness factor using data collected in diffusion experiments for thin and thick chips. Both these parameters were found to vary during the course of acid hydrolysis. A linear relationship was found between these parameters and the extent of cellulose conversion. The effectiveness factor approached unity as cellulose approached 100% for both thin and thick chips.
- Research Organization:
- Auburn Univ., AL (USA)
- OSTI ID:
- 5351500
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
09 BIOMASS FUELS
090222* -- Alcohol Fuels-- Preparation from Wastes or Biomass-- (1976-1989)
140504 -- Solar Energy Conversion-- Biomass Production & Conversion-- (-1989)
ACID HYDROLYSIS
ALDEHYDES
BIOCONVERSION
BIOREACTORS
CARBOHYDRATES
CELLULOSE
CHEMICAL REACTIONS
CONTROL
DATA
DATA COMPILATION
DECOMPOSITION
DIFFUSION
GLUCOSE
HEXOSES
HYDROLYSIS
INFORMATION
LYSIS
MATHEMATICAL MODELS
MONOSACCHARIDES
NUMERICAL DATA
ORGANIC COMPOUNDS
POLYSACCHARIDES
PROCESS CONTROL
PRODUCTIVITY
SACCHARIDES
SOLVOLYSIS
TEMPERATURE EFFECTS
090222* -- Alcohol Fuels-- Preparation from Wastes or Biomass-- (1976-1989)
140504 -- Solar Energy Conversion-- Biomass Production & Conversion-- (-1989)
ACID HYDROLYSIS
ALDEHYDES
BIOCONVERSION
BIOREACTORS
CARBOHYDRATES
CELLULOSE
CHEMICAL REACTIONS
CONTROL
DATA
DATA COMPILATION
DECOMPOSITION
DIFFUSION
GLUCOSE
HEXOSES
HYDROLYSIS
INFORMATION
LYSIS
MATHEMATICAL MODELS
MONOSACCHARIDES
NUMERICAL DATA
ORGANIC COMPOUNDS
POLYSACCHARIDES
PROCESS CONTROL
PRODUCTIVITY
SACCHARIDES
SOLVOLYSIS
TEMPERATURE EFFECTS