Steam explosion as a pretreatment of Cynara cardunculus prior to delignification
(Figure Presented) Cardoon (Cynara cardunculus) stalks were submitted to steam explosion (183°C, 5 min) with a yield of 88% and a lignin loss of around 7%. Cardoon (C) and steam exploded cardoon (CSE) were characterized by wet chemical analysis and Py-GC/MS. Total lignin and its S/G ratio were 21.6% and 1.35 in C and 22.4% and 1.40 in CSE. These samples were delignified by kraft and organosolv processes. Cardoon pulps were obtained with different yields of 45.1% for kraft and 61.2% for organosolv. Kraft pulps yields were 45.1% and 50.9%, respectively, for Ck and CSE-K, corresponding to a lignin loss of 74.7% and 72.2%. The S/G ratio was similar 1.25 and 1.23. Organosolv pulps presented higher yields (61.2% vs 73.3%) and were less delignified (30.5% vs 13.8%), and the S/G ratio was 1.54 and 1.47, respectively, for Corg and CSE-org. Overall, the condition chosen for steam explosion allowed a low mass loss but did not promote delignification and neither enhanced lignin removal during kraft and organosolv processes. © 2016 American Chemical Society.
| Main Authors: | , , , , , |
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| Format: | journal article biblioteca |
| Language: | eng |
| Published: |
2017
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| Online Access: | http://hdl.handle.net/20.500.12792/2523 |
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