Modeling the conversion of glucose to hydroxymethylfurfural Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/zw12z933c

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  • Cellulosic biomass materials have three principal components: cellulose, hemicellulose, and lignin. Under mild acid conditions and high temperature, the first two components yield a variety of sugars: hexoses and pentoses, which are subject to decomposition on continued exposure to hot dilute acid. In the process hexoses yield hydroxymethylfurfural (HMF) which, on continued heating, yields levulinic acid and formic acid and some uncharacterized solid products. Biomass hydrolysis research has now progressed to the point where process analysis and optimization requires a generalized kinetic correlation for hexose degradation. The kinetics for the reaction of glucose to HMF has been studied previously. However, not all of the rate constants for the dehydration of glucose and HMF had been modeled to fit the experimental data. This research had two parts. The first was to model the kinetics for the formation of HMF from glucose in the aqueous phase using the three-constant model suggested by S. W. McKibbins et al. (1962). The other was to study the aqueous-phase reaction carried in the presence of an organic solvent, o-nitrotoluene (ONT), for the purpose of extracting HMF as it is produced; thereby minimizing subsequent degradation of HMF to levulinic acid, formic acid, and solid materials. The HMF distribution coefficient for o-nitrotoluene was measured at different temperatures and modeled as the integrated Van't Hoff equation. Predicted glucose, HMF, and organic acids concentration profiles were compared to the experimentally determined values. The predicted concentration profiles are in good agreement with the experimental data, indicating that the proposal three-constant model is consistent with the true reaction system. In the two-phase system case study, the process was diffusion limiting due to lack of agitation of the mixture.
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  • File scanned at 300 ppi (Monochrome) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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  • description.provenance : Submitted by Kim Stowell (ksscannerosu@gmail.com) on 2013-05-21T23:17:05Z No. of bitstreams: 1 LiuDaming1989.pdf: 637893 bytes, checksum: 6261f272cb4ec5dbbab456cfa9f33961 (MD5)
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