KRAFT PULPING OF EUCALYPTUS GLOBULUS AS A PRETREATMENT FOR BIOETHANOL PRODUCTION BY SIMULTANEOUS SACCHARIFICATION AND FERMENTATION

The kraft pulping process was evaluated in this study as a pretreatment of Eucalyptus globulus for bioethanol production. Wood chips were pretreated under different pulping conditions (155°C and 165°C; 15 and 20 % alkali active AA, 15-60 min). A total of 12 pulps were obtained, with pulp yields rang...

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Autores principales:	MONRROY,MARIEL, RENÁN GARCÍA,JOSÉ, TEIXEIRA MENDONÇA,REGIS, BAEZA,JAIME, FREER,JUANITA
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2012
Materias:	kraft pulping E. globulus SFS and bioethanol
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072012000200012
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spelling	oai:scielo:S0717-970720120002000122014-03-10KRAFT PULPING OF EUCALYPTUS GLOBULUS AS A PRETREATMENT FOR BIOETHANOL PRODUCTION BY SIMULTANEOUS SACCHARIFICATION AND FERMENTATIONMONRROY,MARIELRENÁN GARCÍA,JOSÉTEIXEIRA MENDONÇA,REGISBAEZA,JAIMEFREER,JUANITA kraft pulping E. globulus SFS and bioethanol The kraft pulping process was evaluated in this study as a pretreatment of Eucalyptus globulus for bioethanol production. Wood chips were pretreated under different pulping conditions (155°C and 165°C; 15 and 20 % alkali active AA, 15-60 min). A total of 12 pulps were obtained, with pulp yields ranging from 49 to 57%. Glucan remained in pulps were from 77% and 90%, while 50% of the hemicelluloses were solubilized. Lignin removal increased with increased severity of cooking (high active alkali charge, pretreatment time and temperature) reaching delignification over 78%. The enzymatic hydrolysis of kraft pulps with cellulase presented a rapid glucan conversion rate to glucose with values over 90%. Lignin, hemicellulose removal, as well as, cellulose polymerization degree showed an effect on the increment of enzymatic hydrolysis. The degree of crystallinity increased slightly between 1-5%, having no effect on the enzymatic hydrolysis. The simultaneous saccharification and fermentation was performed (SFS) at 10% substrate consistency with a production at 30-38 g ethanol/L. The maximum amount of ethanol that could be produced from E. globulus is 258 g ethanol/kg wood, assuming total glucose conversion into ethanol. The amounts of ethanol obtained from the different pulps varied between 168-202 g ethanol/kg wood. The ethanol yields obtained from kraft pulps varied between 65 and 78% (wood basis). The maximum ethanol yield was 78% at 155°C, 15% AA and 60 min reaction, while the yield was 74% at 165°C, 15% AA and 30 min of reaction time. Results showed that an efficient enzymatic hydrolysis at low enzyme loads could be obtained from kraft pulps employing less severe conditions than those used to produce bleachable -grade pulps.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.57 n.2 20122012-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072012000200012en10.4067/S0717-97072012000200012
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	kraft pulping E. globulus SFS and bioethanol
spellingShingle	kraft pulping E. globulus SFS and bioethanol MONRROY,MARIEL RENÁN GARCÍA,JOSÉ TEIXEIRA MENDONÇA,REGIS BAEZA,JAIME FREER,JUANITA KRAFT PULPING OF EUCALYPTUS GLOBULUS AS A PRETREATMENT FOR BIOETHANOL PRODUCTION BY SIMULTANEOUS SACCHARIFICATION AND FERMENTATION
description	The kraft pulping process was evaluated in this study as a pretreatment of Eucalyptus globulus for bioethanol production. Wood chips were pretreated under different pulping conditions (155°C and 165°C; 15 and 20 % alkali active AA, 15-60 min). A total of 12 pulps were obtained, with pulp yields ranging from 49 to 57%. Glucan remained in pulps were from 77% and 90%, while 50% of the hemicelluloses were solubilized. Lignin removal increased with increased severity of cooking (high active alkali charge, pretreatment time and temperature) reaching delignification over 78%. The enzymatic hydrolysis of kraft pulps with cellulase presented a rapid glucan conversion rate to glucose with values over 90%. Lignin, hemicellulose removal, as well as, cellulose polymerization degree showed an effect on the increment of enzymatic hydrolysis. The degree of crystallinity increased slightly between 1-5%, having no effect on the enzymatic hydrolysis. The simultaneous saccharification and fermentation was performed (SFS) at 10% substrate consistency with a production at 30-38 g ethanol/L. The maximum amount of ethanol that could be produced from E. globulus is 258 g ethanol/kg wood, assuming total glucose conversion into ethanol. The amounts of ethanol obtained from the different pulps varied between 168-202 g ethanol/kg wood. The ethanol yields obtained from kraft pulps varied between 65 and 78% (wood basis). The maximum ethanol yield was 78% at 155°C, 15% AA and 60 min reaction, while the yield was 74% at 165°C, 15% AA and 30 min of reaction time. Results showed that an efficient enzymatic hydrolysis at low enzyme loads could be obtained from kraft pulps employing less severe conditions than those used to produce bleachable -grade pulps.
author	MONRROY,MARIEL RENÁN GARCÍA,JOSÉ TEIXEIRA MENDONÇA,REGIS BAEZA,JAIME FREER,JUANITA
author_facet	MONRROY,MARIEL RENÁN GARCÍA,JOSÉ TEIXEIRA MENDONÇA,REGIS BAEZA,JAIME FREER,JUANITA
author_sort	MONRROY,MARIEL
title	KRAFT PULPING OF EUCALYPTUS GLOBULUS AS A PRETREATMENT FOR BIOETHANOL PRODUCTION BY SIMULTANEOUS SACCHARIFICATION AND FERMENTATION
title_short	KRAFT PULPING OF EUCALYPTUS GLOBULUS AS A PRETREATMENT FOR BIOETHANOL PRODUCTION BY SIMULTANEOUS SACCHARIFICATION AND FERMENTATION
title_full	KRAFT PULPING OF EUCALYPTUS GLOBULUS AS A PRETREATMENT FOR BIOETHANOL PRODUCTION BY SIMULTANEOUS SACCHARIFICATION AND FERMENTATION
title_fullStr	KRAFT PULPING OF EUCALYPTUS GLOBULUS AS A PRETREATMENT FOR BIOETHANOL PRODUCTION BY SIMULTANEOUS SACCHARIFICATION AND FERMENTATION
title_full_unstemmed	KRAFT PULPING OF EUCALYPTUS GLOBULUS AS A PRETREATMENT FOR BIOETHANOL PRODUCTION BY SIMULTANEOUS SACCHARIFICATION AND FERMENTATION
title_sort	kraft pulping of eucalyptus globulus as a pretreatment for bioethanol production by simultaneous saccharification and fermentation
publisher	Sociedad Chilena de Química
publishDate	2012
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072012000200012
work_keys_str_mv	AT monrroymariel kraftpulpingofeucalyptusglobulusasapretreatmentforbioethanolproductionbysimultaneoussaccharificationandfermentation AT renangarciajose kraftpulpingofeucalyptusglobulusasapretreatmentforbioethanolproductionbysimultaneoussaccharificationandfermentation AT teixeiramendoncaregis kraftpulpingofeucalyptusglobulusasapretreatmentforbioethanolproductionbysimultaneoussaccharificationandfermentation AT baezajaime kraftpulpingofeucalyptusglobulusasapretreatmentforbioethanolproductionbysimultaneoussaccharificationandfermentation AT freerjuanita kraftpulpingofeucalyptusglobulusasapretreatmentforbioethanolproductionbysimultaneoussaccharificationandfermentation
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KRAFT PULPING OF EUCALYPTUS GLOBULUS AS A PRETREATMENT FOR BIOETHANOL PRODUCTION BY SIMULTANEOUS SACCHARIFICATION AND FERMENTATION

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