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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/2551
Title: Supercritical water gasification of glycerol and methanol mixtures as model waste residues from biodiesel refinery
Authors: Reddy, Sivamohan N.
Nanda S.
Kozinski J.A.
Published in: Chemical Engineering Research and Design
Abstract: The eco-friendly processing in biodiesel refineries is feasible with effective utilization of the byproducts and waste residues. The motive of this research is to convert the model byproducts of biodiesel refineries to H2. In this study, different glycerol–methanol mixtures were gasified in supercritical water at variable temperatures (450–600 °C) and pressures (23–25 MPa) for 45 s in a continuous-flow tubular reactor. Glycerol and methanol concentrations were varied from 5 to 20 wt% individually in the mixtures, and their impacts on gas yields were investigated both experimentally and thermodynamically. The thermodynamic simulations were performed using Aspen Plus based on Gibbs free energy minimization method. The thermodynamic yield (25.3 mmol/g) of H2 was higher compared to experimental yields (19 mmol/g) at 600 °C, 25 MPa and 1:1 glycerol-to-methanol feed solution. To enhance the gas yields, the effects of four alkali catalysts such as KOH, NaOH, K2CO3 and Na2CO3 at 0.5 wt% concentration were examined. Among all the catalyst, 0.5 wt% K2CO3 resulted in highest H2 yields (24.8 mmol/g), total gas yields (1.24 g/L) and carbon gasification efficiency (96.7%) at 600 °C and 25 MPa with 1:1 glycerol-to-methanol feed solution. The results suggest that effluents from biodiesel refineries can be used as potential feedstock for waste-to-energy conversion. © 2016 Institution of Chemical Engineers
Citation: Chemical Engineering Research and Design (2016), 113(): 17-27
URI: https://doi.org/10.1016/j.cherd.2016.07.005
http://repository.iitr.ac.in/handle/123456789/2551
Issue Date: 2016
Publisher: Institution of Chemical Engineers
Keywords: Alkali catalysts
Gibbs free energy minimization
Glycerol
Hydrogen
Methanol
Supercritical water
ISSN: 2638762
Author Scopus IDs: 56923787200
56350215900
7003265926
Author Affiliations: Reddy, S.N., Department of Earth and Space Science and Engineering, Lassonde School of Engineering, York University, Ontario, Canada, Department of Chemical Engineering, Indian Institute of Technology RoorkeeUttarakhand, India
Nanda, S., Department of Earth and Space Science and Engineering, Lassonde School of Engineering, York University, Ontario, Canada
Kozinski, J.A., Department of Earth and Space Science and Engineering, Lassonde School of Engineering, York University, Ontario, Canada
Funding Details: We thank Natural Sciences and Engineering Research Council of Canada (NSERC) for funding this research.
Corresponding Author: Reddy, S.N.; Department of Chemical Engineering, Indian Institute of Technology RoorkeeIndia; email: nsiva.fch@iitr.ac.in
Appears in Collections:Journal Publications [CH]

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