Kinetic analysis of the mixture effect in supercritical water oxidation of ammonia/methanol

Shimoda, Eriko; Fujii, Tatsuya; Hayashi, Rumiko; Oshima, Yoshito

doi:10.1016/j.supflu.2016.05.052

Cited by 45 publications

(31 citation statements)

References 34 publications

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“…While the oxidation efficiency of organic carbon increases if treated at reaction conditions far beyond the critical point (e.g., 500 Ce750 C (Cocero et al, 2000)), corrosion of the reactor material becomes more severe (Fang, 2014;Tan et al, 2014). Moreover, high-temperature SCWO typically requires an auxiliary fuel, like methanol or ethanol (Shimoda et al, 2016;Zhang et al, 2019b), considerably increasing the operating costs ( Fig. 1a).…”

Section: Challenges and Needs For Scwo Operationmentioning

confidence: 99%

Effluent recirculation enables near-complete oxidation of organics during supercritical water oxidation at mild conditions: A proof of principle

2020

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Section: Challenges and Needs For Scwo Operationmentioning

confidence: 99%

Effluent recirculation enables near-complete oxidation of organics during supercritical water oxidation at mild conditions: A proof of principle

2020

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“…Eq. (10) and (11) are the rate equations for systems III (NH 4 + ) and IV (NH 4 + + IPA) respectively: Figure 9 and Table 4 show that IPA addition had a significant influence on the reaction rate constant k (in terms of E A and k 0 . IPA addition greatly enhanced the rate of NH 4 + oxidation.…”

Section: Figurementioning

confidence: 99%

Supercritical water oxidation (SCWO) for the removal of nitrogen containing heterocyclic waste hydrocarbons. Part II: System kinetics

Al‐Duri

Alsoqyani

2017

The Journal of Supercritical Fluids

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“…1 Methylamine (CH 3 NH 2 ) represents the simplest organic nitrogen compound, although there have been relatively few studies of its SCWO, 2,3 or of other more complicated nitrogen compounds. [4][5][6][7][8][9][10] Furthermore, although we have a relatively good understanding of the oxidation kinetics of small hydrocarbons, [11][12][13] oxygenated organics, [14][15][16][17] and ammonia [18][19][20] in supercritical water, the detailed chemical kinetic models (DCKMs) developed for methylamine SCWO by Benjamin and Savage 2 and by Li and Oshima 3 demonstrate several shortcomings. In particular, they cannot accurately describe the formation and loss of the major nitrogen containing products and intermediates, such as NH 3 , N 2 O, and N 2 .…”

Section: Introductionmentioning

confidence: 99%

A detailed chemical kinetic model for the supercritical water oxidation of methylamine: The importance of imine formation

Ashraful

Silva

2020

Int J of Chemical Kinetics

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A detailed chemical kinetic model has been developed for supercritical water oxidation (SCWO) of methylamine, CH3NH2, providing insight into the intermediates and final products formed in this process as well as the dominant reaction pathways. The model was adapted from previous mechanisms, with a revision of the peroxyl radical chemistry to include imine formation, which has recently been identified as the dominant gas‐phase pathway in amine oxidation. The developed model can reproduce previous experimental data on methylamine consumption and major product formation to reasonable accuracy, although with deficiencies in describing the induction time. Our simulations indicate that oxidation of the •CH2NH2 radical to methanimine, CH2NH, is the major channel in methylamine SCWO, with subsequent hydrolysis of CH2NH providing the experimentally observed reaction products ammonia and formaldehyde. Integral‐averaged reaction rates were used to identify major reaction pathways, and a first‐order sensitivity analysis indicated that the concentration of CH3NH2 is most sensitive to OH radical kinetics. Overall, this work clarifies the importance of imine chemistry in the oxidation of nitrogen‐containing compounds and indicates that they are necessary to model these compounds in SCWO processes.

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Kinetic analysis of the mixture effect in supercritical water oxidation of ammonia/methanol

Cited by 45 publications

References 34 publications

Effluent recirculation enables near-complete oxidation of organics during supercritical water oxidation at mild conditions: A proof of principle

Effluent recirculation enables near-complete oxidation of organics during supercritical water oxidation at mild conditions: A proof of principle

Supercritical water oxidation (SCWO) for the removal of nitrogen containing heterocyclic waste hydrocarbons. Part II: System kinetics

A detailed chemical kinetic model for the supercritical water oxidation of methylamine: The importance of imine formation

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