Development of a novel hybrid process for the conversion of cellulose into high-value chemicals by applying voltage in hot compressed water
tarafından
Akın, Okan, author.
Başlık
:
Development of a novel hybrid process for the conversion of cellulose into high-value chemicals by applying voltage in hot compressed water
Yazar
:
Akın, Okan, author.
Yazar Ek Girişi
:
Akın, Okan, author.
Fiziksel Tanımlama
:
xiii, 101 leaves: illustrarions, charts;+ 1 computer laser optical disc.
Özet
:
In this study, a novel hybrid method of hydrothermal electrolysis implemented for the decomposition of microcrystalline cellulose (MCC) into high value added chemicals such as levulinic acid, 5-hydroxymethylfurfural (5-HMF), and furfural. The hypothesis of the study was that, when direct current (DC) is applied the formation of ionic and radical species can alter the hydrolysis of cellulose. Based on this hypothesis, the purpose of the study was to build an integrated method of hydrothermal electrolysis that can lower energy requirement of cellulose hydrolysis by altering the selectivity. In order to investigate the individual and coupled effect of operating parameters such as reaction temperature (170-200 ℃), time (30-120 min.), electrolyte concentration (1-50 mM H2SO4), constant current (0-2 A), statistical analysis was conducted by a fractional factorial design. Analysis of variance (ANOVA) test was applied to the main hydrolysis products yields of MCC, total organic carbon (TOC) and cellulose conversion. Based on the response surface plots, 1A of current at 200 ºC maximized TOC yield and cellulose conversions to 62% and 81%, respectively. In order to enhance the selectivity, constant voltage (2.5, 4.0 and 8.0 V) was applied at 200℃. Application of 2.5 V increased TOC (54%) and alter the selectivity of 5-HMF (30%) and levulinic acid (21%). The structural changes in solid residues were analyzed by Fourier Transform Infrared Spectroscopy (FTIR) and found that MCC particles functionalized by carboxylic acid and sulfonated groups by application of 2.5 V. Therefore, change in the selectivity values were conducted with the functionalization of MCC particles due to applied voltage under sub-critical conditions.
Konu Başlığı
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Supercritical fluids.
Biomass chemicals.
Yazar Ek Girişi
:
Yüksel Özşen, Aslı,
Tüzel Kişi Ek Girişi
:
İzmir Institute of Technology. Chemical Engineering.
Tek Biçim Eser Adı
:
Thesis (Doctoral)--İzmir Institute of Technology: Chemical Engineering.
İzmir Institute of Technology: Chemical Engineering--Thesis (Doctoral).
Elektronik Erişim
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Library | Materyal Türü | Demirbaş Numarası | Yer Numarası | Durumu/İade Tarihi |
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IYTE Library | Tez | T001671 | TP156.E8 A31 2017 | Tez Koleksiyonu |