6 research outputs found
Sugar cane bagasse as feedstock for second generation ethanol production. Part I: Diluted acid pretreatment optimization
Tons of sugar cane bagasse are produced in Brazil as waste of the sugar
and ethanol industries. This lignocellulosic material is a potential
source for second-generation ethanol production. Diluted acid
hydrolysis is one of the most efficient pretreatments for
hemicellulosic solubilization. The hydrolysate obtained is rich in
xylose, which can be converted to ethanol by Pichia stipitis. This work
used a statistical approach and the severity factor to investigate the
effects of factors associated with the diluted acid hydrolysis process
(acid concentration, solid:liquid ratio and time of exposure) on
various response variables (xylose concentration, hydrolysis yield,
inhibitor concentration and hydrolysate fermentability). The severity
factor had a strong influence on the generation of inhibitors. The
statistical analysis was useful for determining the effects of the
individual factors and their interactions on the response variables. An
acid concentration of 1.09% (vv), an S:L ratio of 1:2.8 (g:ml), and an
exposure time of 27 min were established and validated as the optimum
pretreatment conditions for the generation of hydrolysates with high
xylose concentration and low contents of inhibitors. In such
conditions, hydrolysate with 50 g/l of xylose was obtained
Sugar cane bagasse as feedstock for second generation ethanol production. Part II: Hemicellulose hydrolysate fermentability
Sugar cane bagasse is produced in Brazil as waste of the sugar and
ethanol industries. This lignocellulosic material is a potential source
for second-generation ethanol production; however a pretreatment stage
is essential, which aims at removing the hemicellulose component by
disorganizing the lignocellulosic complex. In this work sugar cane
bagasse was pretreated by diluted acid hydrolysis resulting in
xylose-rich hydrolysates, which could be fermented to ethanol by a
strain of the yeast Pichia stipitis. Statistical approach was used to
investigate the effects of factors associated with the diluted acid
hydrolysis process (acid concentration, solid:liquid ratio and time of
exposure) on the fermentability of different hydrolysates. The
statistical analysis was useful for determining the effects of the
individual factors and their interactions on the response variables. An
acid concentration of 1.09% (v/v), a solid:liquid ratio of 1:2.8
(g:ml), and an exposure time of 27 min were established and validated
as the optimum pretreatment conditions for ethanol production from
hemicellulose hydrolysates of sugar cane bagasse. Under these
conditions, a hydrolysate with 50 g/l of xylose, 6.04 g/l of acetic
acid, 0.55 g/l of hydroxylmethylfurfural and 0.09 g/l of furfural was
obtained and its fermentation yielded roughly 20 g/l of ethanol in 40
hrs
Sugar cane bagasse as feedstock for second generation ethanol production. Part I: Diluted acid pretreatment optimization
Tons of sugar cane bagasse are produced in Brazil as waste of the sugar
and ethanol industries. This lignocellulosic material is a potential
source for second-generation ethanol production. Diluted acid
hydrolysis is one of the most efficient pretreatments for
hemicellulosic solubilization. The hydrolysate obtained is rich in
xylose, which can be converted to ethanol by Pichia stipitis. This work
used a statistical approach and the severity factor to investigate the
effects of factors associated with the diluted acid hydrolysis process
(acid concentration, solid:liquid ratio and time of exposure) on
various response variables (xylose concentration, hydrolysis yield,
inhibitor concentration and hydrolysate fermentability). The severity
factor had a strong influence on the generation of inhibitors. The
statistical analysis was useful for determining the effects of the
individual factors and their interactions on the response variables. An
acid concentration of 1.09% (vv), an S:L ratio of 1:2.8 (g:ml), and an
exposure time of 27 min were established and validated as the optimum
pretreatment conditions for the generation of hydrolysates with high
xylose concentration and low contents of inhibitors. In such
conditions, hydrolysate with 50 g/l of xylose was obtained
Biota Colombiana Volumen 18 No. 1 (2017)
Volumen 18 Número 1 de la revista Biota ColombianaBogotá, Colombi
Volumen 18 Número 1
Revista seriada del Instituto Humboldt en asocio con el Invemar, el Instituto de Ciencias Naturales (ICN) y el Missouri Botanical Garden, como una estrategia para ampliar la base del conocimiento de uno de los países con mayor diversidad biológica del mundo.
Inicia como una publicación de listados de especies pero en 2005 amplía su espectro temático hacia la sistemática y la biogeografía. En 2010, a propósito del Año Internacional de la Biodiversidad y en pro del conocimiento, la conservación y el uso sostenible de la biodiversidad, se abre a un público más amplio, considerando trabajos inéditos de investigación sobre botánica, zoología, ecología, biología, limnología, pesquerías, conservación, manejo de recursos y uso de la biodiversidad, con buena aceptación por parte de la comunidad científica y académica. En 2013, en asocio con el SiB Colombia y con el apoyo de la GBIF, se institucionaliza la inclusión de Artículos de Datos (Data Papers) en Biota Colombiana
Volumen 18 Número 1
Revista seriada del Instituto Humboldt en asocio con el Invemar, el Instituto de Ciencias Naturales (ICN) y el Missouri Botanical Garden, como una estrategia para ampliar la base del conocimiento de uno de los países con mayor diversidad biológica del mundo.Inicia como una publicación de listados de especies pero en 2005 amplía su espectro temático hacia la sistemática y la biogeografía. En 2010, a propósito del Año Internacional de la Biodiversidad y en pro del conocimiento, la conservación y el uso sostenible de la biodiversidad, se abre a un público más amplio, considerando trabajos inéditos de investigación sobre botánica, zoología, ecología, biología, limnología, pesquerías, conservación, manejo de recursos y uso de la biodiversidad, con buena aceptación por parte de la comunidad científica y académica. En 2013, en asocio con el SiB Colombia y con el apoyo de la GBIF, se institucionaliza la inclusión de Artículos de Datos (Data Papers) en Biota Colombiana.Artículo revisado por pare