Ethanol production from wood via concentrated acid hydrolysis, chromatographic separation, and fermentation

Abstract

BACKGROUND: Production of bioethanol from wood using concentrated acid hydrolysis has received less attention than the dilute acid hydrolysis route. The feasibility of producing lignocellulosic bioethanol from spruce and birch via concentrated acid hydrolysis was studied experimentally. Hydrolysis with sulfuric acid, chromatographic purification of the hydrolysate, and fermentation of the monosaccharides were investigated.

Effect of torrefaction for the pretreatment of rice straw for ethanol production

“…Unfortunately, wild‐type S. cerevisiae cannot utilise pentose sugars (xylose, arabinose and ribose) in the hydrolysates of lignocellulosic biomass. However, naturally occurring yeasts such as P. stipitis are able to ferment both glucose and xylose to ethanol . Therefore, in order to investigate the potential ethanol fermentation of torrefied rice straw, both S. cerevisiae (KCCM 11304) and P. stipitis (KCCM 12009) were used.…”

“…However, naturally occurring yeasts such as P. stipitis are able to ferment both glucose and xylose to ethanol. 37 Therefore, in order to investigate the potential ethanol fermentation of torrefied rice straw, both S.cerevisiae (KCCM 11304) and P. stipitis (KCCM 12009) were used. Saccharified rice straw samples were treated under three different conditions during fermentation, i.e.…”

Chromatographic Recovery of Monosaccharides and Lignin from Lignocellulosic Hydrolysates

“…Monosaccharides can be produced from lignocellulosic biomass by hydrolysis during which the polysaccharides, i.e., cellulose and hemicelluloses, in the biomass are cleaved into monosaccharides with mineral acids, e.g., sulfuric acid, or enzymes as the catalysts . During acidic hydrolysis, a number of other components are also formed or dissolved from the biomass, and end up to a monosaccharide‐rich solution.…”

Organosolv Fractionation of Softwood Biomass for Biofuel and Biorefinery Applications

“…Another benefit is its high content in carbohydrates -mainly cellulose-that could provide the fermentable sugars required for production of bioethanol, i.e., biomass derived ethanol as a fuel to substitute gasoline. Although an acid catalysed hydrolysis reaction can easily release these polysaccharides in the form of simple sugars [3,4], the requirements for the development of green technologies have driven efforts towards the more benign enzymatic hydrolysis of the carbohydrates in biomass. An array of cellulolytic enzymes is required to reduce the rigid crystalline structure of cellulose into free glucose molecules [5].…”