Journal
APPLIED ENERGY
Volume 88, Issue 7, Pages 2472-2479Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2011.01.031
Keywords
Sweet sorghum bagasse; Liquid hot water; Sugar recovery; Lignin; Enzymatic hydrolysis
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Funding
- National High Technology Research and Development Program of China [2010AA101606, 2009AA052436]
- Chinese Academy of Sciences [KSCX2-YW-G-063, KSCX1-YW-11-A3]
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A step-change flow rate liquid hot water (SCFLHW) process was developed with the objective of improving the total sugars recovery including xylose and glucose from sweet sorghum bagasse (SSB). Total xylose yield increased from 60% for batch system (4.25% w/v, 18 min, 184 degrees C) to about 80% at an initial flow rate of 20 ml/min for 8 min, followed by a rate of 10 ml/min for 10 min. It was hypothesized that the flowing water could enhance the mass transfer and improves the sugars recovery. Although little lignin was removed, the 72 h enzymatic digestibility of treated sample was enhanced by the increase of flow rate. The lignin droplet redeposited on the surface of residual solids might play a crucial role in determining the enzymatic digestibility. The total recovery of sugars from SSB, after the pretreatment (first with the flow rate of 20 ml/min for 8 min, then 10 ml/min for 10 min) and 72 h enzymatic digestion, reached 83.7%, which is superior to the recovery using the SO2-steam pretreatment or ammonia fiber expansion. (C) 2011 Elsevier Ltd All rights reserved.
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