Journal
BIOMASS CONVERSION AND BIOREFINERY
Volume -, Issue -, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s13399-022-02392-6
Keywords
1-Ethyl-3-methylimidazolium acetate; Dimethyl sulfoxide; Reused pretreatment; Delignification; Cellulose conversion
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Funding
- National Research Council of Thailand
- King Mongkut's University of Technology Thonburi through the KMUTT Research Center of Excellence Project
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This study introduces a method of high delignification by reusing [EMIM]OAc:DMSO with additional DMSO, showing promising results in cellulose conversion and ethanol yield. The research demonstrates a novel protocol and mechanism for efficient cellulose hydrolysis to ethanol, with up to 17 rounds of reuse possible under controlled conditions.
In this work, a method of reusing 1-ethyl-3-methylimidazolium acetate and dimethyl sulfoxide ([EMIM]OAc:DMSO) with additional DMSO has been developed for high delignification. From the results, the delignification in the first reuse of [EMIM] OAc:DMSO with at a ratio of 1:1 is 1.66-folds higher than that of the initial pretreatment. By considering a percentage cellulose conversion higher than 80%, [EMIM]OAc:DMSO in the ratio of 1:1 can be reused up to 17 rounds. Especially with the first reuse, 87.97 +/- 0.11% cellulose conversion and 92.45 +/- 0.14% ethanol yield can be determined according to the high enzymatic hydrolysis and ethanol fermentation. Furthermore, the decreases in the values of Lateral Order Index by FT-IR and Crystallinity Index by XRD demonstrate decreases in crystalline cellulose by 1.05- and 1.59-fold of original cellulose structure, respectively, suggesting a novel protocol and mechanism of pretreatment for high yield efficiency of cellulose hydrolysis to ethanol.
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