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Acetosolv delignification of Dichrostachys cinerea biomass for ethanol production
University of Borås, School of Engineering.
2009 (English)Independent thesis Advanced level (degree of Master (One Year))Student thesis
Abstract [en]

The interest in production of fuel ethanol from lignocellulosic materials is continuously increasing due to the urgency of finding non-food substrates for production of bio-fuels. Marabou (Dichrostachys cinerea) is one of the abundant lignocellulosic bio-resources in Cuba, and it could be useful to produce bio-ethanol. Pre-treatment is an important step to produce ethanol from lignocellulosic materials since it allows the separation of cellulose, hemicellulose and lignin, and activates cellulose towards enzymatic hydrolysis. During the past few years, organosolv methods have been reported for effective separation of the main components of lignocellulosic materials and improvement of the enzymatic hydrolysis of cellulose. By using acetosolv method lignin is separated under mild conditions and many of the lignin properties are well preserved. The present work was aimed to perform a chemical characterisation of marabou biomass and to evaluate acetosolv delignification of the material. In this work the content of moisture, ash, extractives, easy-to-hydrolyze polysaccharides, difficult-to-hydrolyze polysaccharides, and Klason lignin of marabou biomass were analyzed. Klason lignin of the marabou biomass was 23.4% of the mass. Acetosolv delignification was performed at normal boiling temperature (NBT) and 121oC, using 50-50, 70-30 and 90-10 acetic acid – water mixtures with 10% of solids load during 1h. Hydrochloric acid (0.2g / 100g of mixture) was used as catalyst. The delignification of marabou biomass was also evaluated for the combination of dilute acid prehydrolysis (DAPH) and acetosolv with the same reaction conditions. This investigation proved that acetosolv pretreatment was effective for solubilizing lignin contained in marabou biomass. The degree of lignin solubilisation increased with increasing acetic acid concentration in the reaction mixture. Lignin removals above 80% were achieved consistently both at NBT and 121oC with 90% acetic acid, while only around 44.6 and 6.8% of the initial lignin was removed using, respectively, 70 and 50% acetic acid at 121oC. The effect of temperature on delignification was only marginal when acetosolv was conducted with 90% acetic acid, but it was remarkable for lower acetic acid concentrations. A two-fold decrease of lignin removal was observed for the NBT acetosolv compared with the process performed at 121oC using both 70 and 50% acetic acid. The insertion of a DAPH step prior to acetosolv considerably improved lignin removal using 70 and 50% acetic acid at both temperatures, but its effect on the processes using 90% acetic acid was minimal. High lignin yields were achieved upon its precipitation from acetosolv liquors.

Place, publisher, year, edition, pages
University of Borås/School of Engineering , 2009.
Series
Magisteruppsats
Keywords [en]
dichrostachys cinerea, delignification, acetosolv
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:hb:diva-19582Local ID: 2320/5482OAI: oai:DiVA.org:hb-19582DiVA, id: diva2:1311516
Available from: 2019-04-30 Created: 2019-04-30

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CiteExportLink to record
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Citation style
  • apa
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