Sunday, May 3, 2009
3-22

Organosolv pretreatment of Liriodendron tulipifera with acid and alkali catalysts

Bon-Wook Koo1, Nahyun Park1, Hwanmyung Yeo1, Su-Yeon Lee1, Ho-Yong Kim1, Hoon Kim2, and In-Gyu Choi1. (1) Department of Forest Sciences, Seoul National University, Gwanak-ro 599 Daehak-dong Kwanak-gu, Seoul, South Korea, (2) HaidongEokom Co,.Ltd, Jangchung-dong 1-Ga, Jung-gu, Seoul, South Korea

To confirm the pretreatment behavior on catalyst in organosolv pretreatment, pretreatments of Liriodendron tulipifera were carried out. Grounded materials and Meicelase were used. All pretreatments were carried out in minibomb (500ml) and the ratio of mixture was 1:20 (10g/200ml). 50% of EtOH was used as solvent and 1% of H2SO4 and NaOH were applied as catalysts. The mixtures were pretreated at 180 and 200°C for 30 and 60 min. Pretreated mixtures were washed with distilled water and divided into the solid and liquid fraction.

 First, chemical composition of pretreated material was very similar in case of both catalysts. Hemicellulose was decreased largely but lignin was decreased a little, compared to control. Crystallinity was very different on catalyst. Although, crystallinity of the alkali was almost similar to the control, crystallinity of the acid was increased largely by the degradation of amorphous cellulose. It might indicate that crystallinity is not an important pretreatment factor. In the case of the digestibility, both of acid (8.09→74.21%) and alkali (8.09→63.66%) improved the digestibility, however, pretreatment behavior on catalyst was very different. Alkali improved the digestibility at all conditions, but acid improved the digestibility at specific conditions with 200 °C and 60 min in this study. The SEM image on catalyst was also different. In the case of acid, the increase of pore was observed by the preceding of hemicellulose degradation, and it might improve the accessibility of cellulase. However, fiber exposure by the lignin degradation in alkali catalyst pretreatment might improve the digestibility.


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See more of The 31st Symposium on Biotechnology for Fuels and Chemicals (May 3-6, 2009)