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A techno-economic assessment of the potential for combining supercritical water oxidation with ‘in-situ’ hydrothermal synthesis of nanocatalysts using a counter current mixing reactor

Al-Atta, Ammar; Huddle, Thomas ; Rodríguez, Yoana García; Mato, Fidel; García-Serna, Juan ; Cocero, María J. ; Gomes, Rachel ; Lester, Edward

Authors

Ammar Al-Atta

Thomas Huddle

Yoana García Rodríguez

Fidel Mato

Juan García-Serna

María J. Cocero

Rachel Gomes

Edward Lester



Abstract

A combined process of supercritical water oxidation (SCWO) and supercritical water hydrothermal synthesis (SCWHS) in a continuous counter current reactor is reported. Acrylic acid was used as a model unsaturated carboxylic acid compound and the effects of the reaction temperature, residence time, oxidant ratio and acrylic acid concentration on chemical oxygen demand (COD) were all investigated. Two different experimental configurations for oxidant delivery were carried out in ‘pre-heated’ and ‘non-preheated’ oxidant configurations. With a stoichiometric excess of 100% oxygen, COD reduction levels of 80% (non-preheated) and 15% (preheated) were achieved with very short residence times. SCWHS was achieved through the addition of small amounts of various soluble metal salts in the cold upflow resulted in nanoparticles forming which increased the reaction rate and hydrothermal oxidation efficiency. The addition of small amounts of chromium nitrate (>5mM) results in nearly 100% COD reduction at 380 °C and residence times of 0.75 s. The potential economic benefits of combining the two processes together, in the different configurations, were also evaluated.

Journal Article Type Article
Publication Date Jul 15, 2018
Journal Chemical Engineering Journal
Print ISSN 1385-8947
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 344
Pages 431-440
APA6 Citation Al-Atta, A., Huddle, T., Rodríguez, Y. G., Mato, F., García-Serna, J., Cocero, M. J., …Lester, E. (2018). A techno-economic assessment of the potential for combining supercritical water oxidation with ‘in-situ’ hydrothermal synthesis of nanocatalysts using a counter current mixing reactor. Chemical Engineering Journal, 344, 431-440. https://doi.org/10.1016/j.cej.2018.03.058
DOI https://doi.org/10.1016/j.cej.2018.03.058
Keywords Industrial and Manufacturing Engineering; General Chemistry; General Chemical Engineering; Environmental Chemistry
Publisher URL https://www.sciencedirect.com/science/article/pii/S1385894718304169?via%3Dihub
Additional Information This article is maintained by: Elsevier; Article Title: A techno-economic assessment of the potential for combining supercritical water oxidation with ‘in-situ’ hydrothermal synthesis of nanocatalysts using a counter current mixing reactor; Journal Title: Chemical Engineering Journal; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.cej.2018.03.058; Content Type: article; Copyright: © 2018 Elsevier B.V. All rights reserved.

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