Title:
Changes in the Polysaccharide Complex of Lignocellulose after Catalytic Hydrothermal Pre-Treatment Process of Hemp (Cannabis Sativa L.) Shives
Author(s):
Paze, A., Brazdausks, P., Rizhikovs, J., Puke, M., Tupciauskas, R., Andzs, M., Meile, K., Vedernikovs, N.
Document(s):
Paper
Poster
Abstract:
Due to their high amount of pentosans, hemp (Cannabis sativa L.) shives are suitable for the production of furfural - a platform chemical. However, after the catalytic hydrothermal pre-treatment process, 60-85 wt% of lignocellulose (LC) is leftover, which also requires a rational utilization to realize the biorefinery concept. In this study, the polysaccharide complex (cellulose and holocellulose) and its structural changes (a-, ß-, .-cellulose and the average degree of polymerization) in the LC after obtaining furfural were investigated for the first time. The catalytic pre-treatment parameters were as follows: 140-180°C; Al2(SO4)3 - 3, 5 and 7 wt%; 90 min. Autocatalysis was carried out as a reference process. With an increase in the pre-treatment temperature, the degradation changes of cellulose were evidenced by the decreased amount of cellulose (from 41.7 to 20.5 wt%) and the average degree of polymerization (from 800 to 70). The decrease in the holocellulose content (from 71.9 to 29.1 wt%) and the absence of .-cellulose content (from 30.2 to 0.0 wt%) showed that hemicelluloses were removed from LC. The optimal catalytic hydrothermal pretreatment process parameters, when cellulose was slightly depolymerized to be more accessible for further processing, were a temperature of 160°C and 5 wt% Al2(SO4)3. During autohydrolysis in the temperature range 140-180°C the decrease in the average degree of polymerization was much more gradual than in the case of catalytic pretreatment.
Keywords:
lignocellulose, hydrothermal pretreatment, hemp shives, Cannabis sativa L., polysaccharide
Topic:
Biomass Conversion Technologies for Liquid and Gaseous Fuels, Chemicals and Materials
Subtopic:
Biorefineries and chemicals production
Event:
23rd European Biomass Conference and Exhibition
Session:
3AV.3.12
Pages:
1063 - 1069
ISBN:
978-88-89407-516
Paper DOI:
10.5071/23rdEUBCE2015-3AV.3.12
Price:
FREE
