| A comprehensive kinetic model for dilute-acid hydrolysis of cellulose. | |
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MedLine Citation:
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PMID: 12721457 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Acid-catalyzed hydrolysis is controlled not only by temperature and acid concentration but also by the physical state of the cellulose. Under low temperature and acid condition the cellulose structure stays in stable crystalline form. Therefore, the prevailing reaction mode is endwise hydrolysis. Glucose then becomes the main sugar product. However, when temperature and/or acid concentration is raised to a certain level, the cellulose structure becomes unstable by breakage of hydrogen bonding, the primary force that holds the cellulose chains. Once the crystalline structure of the cellulose is disrupted, acid molecules can penetrate into the inner layers of the cellulose chains. In support of this hypothesis, we have experimentally verified that a substantial amount of oligomers is formed as reaction intermediates under extremely low-acid and high-temperature conditions. We also found that the breakage of hydrogen bonds occurs rather abruptly in response to temperature. One such condition is 210 degrees C, 0.07% H2SO4. Glucose, once it is formed in the hydrolysate, interacts with acid-soluble lignin, forming a lignin-carbohydrate complex. This occurs concurrently with other reactions involving glucose such as decomposition and reversion. On the basis of these findings, a comprehensive kinetic model is proposed. This model is in full compliance with our recent experimental data obtained under a broad range of reaction conditions. |
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Authors:
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Qian Xiang; Jun Seok Kim; Y Y Lee |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Applied biochemistry and biotechnology Volume: 105 -108 ISSN: 0273-2289 ISO Abbreviation: Appl. Biochem. Biotechnol. Publication Date: 2003 |
Date Detail:
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Created Date: 2003-04-30 Completed Date: 2003-08-01 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8208561 Medline TA: Appl Biochem Biotechnol Country: United States |
Other Details:
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Languages: eng Pagination: 337-52 Citation Subset: IM |
Affiliation:
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Department of Chemical Engineering, 230 Ross Hall, Auburn University, Auburn, AL 36849, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animal Feed Carbohydrate Sequence Catalysis Cellulose / chemistry* Hydrogen-Ion Concentration Hydrolysis Indicators and Reagents Kinetics Models, Theoretical Molecular Sequence Data Populus / chemistry |
| Chemical | |
Reg. No./Substance:
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0/Indicators and Reagents; 9004-34-6/Cellulose |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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