Title of Paper:Enhancing enzyme hydrolysis of Sorghum stalk by CO2-pressurized liquid hot water pretreatment

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Date of Publication:2017-01-01

Journal:ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY

Included Journals:SCIE、EI、Scopus

Volume:36

Issue:1

Page Number:208-213

ISSN No.:1944-7442

Key Words:liquid hot water pretreatment; carbonic acid pretreatment; Sorghum stalk

Abstract:CO2-pressurized liquid hot water was applied to pretreat Sorghum stalk to increase its accessibility for enzyme hydrolysis. Pretreatment temperatures tested ranged from 180 to 220 degrees C, and reaction times varied between 10 and 30 min. The highest total reducing sugar yield of 81.54% was obtained for the sample pretreated at 200 degrees C and 20 min. Different from the N-2-pressurized liquid hot water process, the generated carbonic acid in the CO2-pressurized method acted as catalyst in the pretreatment process. It was found that the reducing sugar yield increased significantly at lower temperature and shorter reaction time with the addition of CO2. Finally, X-ray diffraction and scanning electron microscope analysis were used to investigate the microstructure of the Sorghum stalk before and after the pretreatment. (c) 2016 American Institute of Chemical Engineers Environ Prog, 36: 208-213, 2017