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Alcohol SCWG Manuscript.pdf (954.43 kB)

Gasification Pathways and Reaction Mechanisms of Primary Alcohols in Supercritical Water

preprint
revised on 22.12.2019, 04:51 and posted on 23.12.2019, 22:36 by Brian Pinkard, John Kramlich, Igor V. Novosselov

Supercritical water gasification is a promising waste-to-energy technology with the ability to convert aqueous and/or heterogeneous organic feedstocks to high-value gaseous products. Reaction behavior of complex molecules in supercritical water can be inferred through knowledge of the reaction pathways of model compounds in supercritical water. In this study methanol, ethanol, and isopropyl alcohol are gasified in a continuous supercritical water reactor at temperatures between 500 and 560 °C, and for residence times between 3 and 8 s. In situ Raman spectroscopy is used to rapidly identify and quantify reaction products. The results suggest the dominance of chain-branching, free radical reaction mechanisms that are responsible for decomposing primary alcohols in the supercritical water environment. The presence of a catalytic surface is proposed to be highly significant for initiating radical reactions. Global reaction pathways are proposed, and mechanisms for free radical reaction initiation, propagation, and termination are discussed in light of these and previously published experimental results.


History

Email Address of Submitting Author

pinkardb@uw.edu

Institution

University of Washington

Country

United States

ORCID For Submitting Author

0000-0002-4517-4712

Declaration of Conflict of Interest

No conflict of interest to declare

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