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Effect of transient acid diffusion on pretreatment/hydrolysis of hardwood hemicellulose |
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| Authors: | Tillman L. M. Lee Y. Y. Torget R. |
| Affiliation: | 1.Department of Chemical Engineering, Auburn University, 36849, Auburn, AL ;2.Solar Energy Research Institute, CO 80401, Golden ; |
| Abstract: | Diffusivities of sulfuric acid in Aspen wood were experimentally determined at various diffusional temperatures and fitted to Arrhenius equations. These equations were subsequently incorporated into a theoretical model to establish the effect of transient acid concentration gradients within a solid substrate during acid-catalyzed hydrolysis of hemicellulose. Total xylose yield was found to decrease for increasing chip size, and this effect was intensified by increasing reaction temperature. Quantitative criteria were established for assessment of transient acid concentration effects upon xylose yield and reaction time at various reaction conditions. |
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