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Separation of short-chain glucan oligomers from molten salt hydrate and hydrolysis to glucose.
- Source :
-
Green Chemistry . 6/7/2021, Vol. 23 Issue 11, p4114-4124. 11p. - Publication Year :
- 2021
-
Abstract
- Selective production of glucose from the hydrolysis of cellulose is the key step for efficient utilization of lignocellulose biomass. Crystalline cellulose can be dissolved and hydrolyzed into glucose with a high selectivity in molten salt hydrates (MSHs). However, the separation of the formed glucose is challenging due to its high solubility in the MSHs. To address this issue, a stepwise method is introduced, where cellulose is hydrolyzed into short-chain glucan oligomers in the MSH of LiBr. We demonstrate that compared to glucose, the formed glucan oligomers with a degree of polymerization of 4–11 can be efficiently separated from the MSH hydrolysate using an anti-solvent precipitation method. The separated oligomers can be readily converted into glucose under mild conditions and used for other applications. Under optimized conditions, 90.3% of glucan oligomer can be produced from crystalline cellulose and separated from the MSH with the addition of methanol, and the precipitated glucan oligomer can be hydrolyzed into glucose with a yield of 99.7% using dilute sulfuric acid. We show that the precipitation efficiency is influenced by the glucan oligomer chain length, glycoside bond type and concentration. Moreover, the separation of a glucan oligomer from a cotton straw hydrolysate was also investigated in the MSH. 79.2% yield of glucan oligomer was obtained from the hydrolysis of cotton straw at 130 °C for 2 h. With the addition of methanol, the glucan oligomer was precipitated with a selectivity of 60.8%. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14639262
- Volume :
- 23
- Issue :
- 11
- Database :
- Academic Search Index
- Journal :
- Green Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 150825272
- Full Text :
- https://doi.org/10.1039/d1gc00851j