Understanding Hydrogen in Bayer Process Emissions. 2. Hydrogen Production during the Degradation of Unsaturated Carboxylic Acids in Sodium Hydroxide SolutionsClick to copy article linkArticle link copied!
Abstract
This is the second in a series of studies of the production of hydrogen from the degradation of organic compounds in sodium hydroxide solutions. Unsaturated carboxylates, which are intermediate products in the wet oxidation of the types of monoaromatic compounds typically present in Bayer process liquors, have been found to produce significant amounts of hydrogen during alkaline degradation. The alkaline degradation of nine unsaturated carboxylates was investigated under anaerobic conditions in an autoclave, and the effect of temperature (175–275 °C) and NaOH concentration (0–6 M) on the degradation of acrylate, 2-butenoate, maleate, and 2-hexenoate was studied in detail for reaction times up to 120 min. All of the compounds investigated decompose to produce about 1 mol of hydrogen gas per mole of organic compound consumed, as well as a range of low molecular weight (LMW) carboxylates. The stoichiometries of the formation of hydrogen and LMW carboxylates from the unsaturated carboxylates observed here are consistent with the regioselective hydration of the C═C double bond to form the corresponding β-hydroxycarboxylates, which then undergo further degradation by an ionic mechanism involving base-catalyzed oxidation by water. These findings significantly advance the understanding of the production of hydrogen in Bayer process digestion and have implications for the safe application of wet oxidation of Bayer process liquors. The results also advance the fundamental understanding of the alkaline degradation of α,β-unsaturated carbonyl compounds in general.
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This article is cited by 8 publications.
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- Allan Costine, Joanne S. C. Loh, Francesco Busetti, Cynthia A. Joll, and Anna Heitz . Understanding Hydrogen in Bayer Process Emissions. 3. Hydrogen Production during the Degradation of Polyols in Sodium Hydroxide Solutions. Industrial & Engineering Chemistry Research 2013, 52
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- Ye Zhang, Rui Xu, Honghu Tang, Li Wang, Wei Sun. A review on approaches for hazardous organics removal from Bayer liquors. Journal of Hazardous Materials 2020, 397 , 122772. https://doi.org/10.1016/j.jhazmat.2020.122772
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- Greg Power, Joanne S.C. Loh, Chris Vernon. Organic compounds in the processing of lateritic bauxites to alumina Part 2: Effects of organics in the Bayer process. Hydrometallurgy 2012, 127-128 , 125-149. https://doi.org/10.1016/j.hydromet.2012.07.010
- Allan Costine, Joanne S.C. Loh, Greg Power, Mark Schibeci, Robbie G. McDonald. Understanding Hydrogen in Bayer Process Emissions. 1. Hydrogen Production during the Degradation of Hydroxycarboxylic Acids in Sodium Hydroxide Solutions. Industrial & Engineering Chemistry Research 2011, 50
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