Fermentation inhibitors and their recovery from acid wood hydrolyzates as chemicals of value
The principal objective of this study was to demonstrate the technical feasibility of fermentation inhibition removal from acid hydrolyzates of lignocellulosic materials and recovery of the by-products of acid hydrolysis as chemicals of value. The acid hydrolyzates of mixed hardwoods were produced from the continuous flow demonstration unit (CFDU) at the University of California Forest Products Laboratory. Two separate liquid product streams were the prehydrolyzate (S1H) and the second stage hydrolyzate (S2H). Candida utilis NRRL Y-900 and Saccharomyces cerevisiae NRRL 2034 were used to monitor the fermentability of these two product streams, respectively. Two pretreatment methods were investigated in detail: flashing and solvent extraction. For the S1H, flashing was adequate to enable cell production with Candida utilis. The S2H rehired solvent extraction to ensure ethanolic fermentation at high concentrations of glucose (12% or higher). A solvent was selected for the extraction process and process flow designs were proposed to recycle the solvent and isolate commercial by-products, including furfural, methanol, acetic acid and, potentially, formic acid, levulinic acid and 5-hydroxymethylfurfural.
- Research Organization:
- California Univ., Berkeley, CA (United States)
- OSTI ID:
- 5508485
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
090900* -- Biomass Fuels-- Processing-- (1990-)
ACID HYDROLYSIS
ALCOHOLS
BIOCONVERSION
BY-PRODUCTS
CANDIDA
CARBOHYDRATES
CELLULOSE
CHEMICAL FEEDSTOCKS
CHEMICAL REACTIONS
DECOMPOSITION
ETHANOL
EUMYCOTA
EXTRACTION
FEASIBILITY STUDIES
FERMENTATION
FUNGI
GROWTH
HYDROLYSIS
HYDROXY COMPOUNDS
INHIBITION
LYSIS
MANAGEMENT
MATERIALS RECOVERY
MICROORGANISMS
ORGANIC COMPOUNDS
PLANTS
POLYSACCHARIDES
PROCESSING
RECOVERY
SACCHARIDES
SACCHAROMYCES
SACCHAROMYCES CEREVISIAE
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVOLYSIS
WASTE MANAGEMENT
WASTE PROCESSING
YEASTS