Supercritical water oxidation (SCWO) for the removal of N-containing heterocyclic hydrocarbon wastes. Part I: Process enhancement by addition of isopropyl alcohol

Al‐Duri, Bushra; Alsoqyiani, F.; Kings, Iain

doi:10.1016/j.supflu.2016.05.002

Cited by 46 publications

(11 citation statements)

References 17 publications

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“…IPA addition showed some influence on TOC % removal at various temperatures. In effect, this agrees with the experimental results of Part I [16], which showed that IPA addition had a minor influence on TOC % removal. Figure 3 shows the analysis of data to evaluate k 0 and E a .…”

Section: Figuresupporting

confidence: 91%

“…The experimental apparatus designed and constructed at the University of Birmingham (UK), was detailed in previous work [16]. It comprises a 12m plug-flow SS316 reactor of 1/16" diameter (0.6mm ID) and 3.07mL volume.…”

Section: Apparatusmentioning

confidence: 99%

“…Wang et al[15] achieved 99.7% TOC removal for SCWO of cotton dyeing effluents by SCWO in a tubular reactor, and recommended high temperature and oxidant ratio for good ammonia nitrogen (NH 3 -N).This work investigates the kinetics of SCWO of DBU and NH 3 in the presence and absence of isopropyl alcohol (IPA), applying the pseudo first order and the global power law rate expressions to the experimental data[16].…”

mentioning

confidence: 99%

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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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Section: Figuresupporting

confidence: 91%

Section: Apparatusmentioning

confidence: 99%

mentioning

confidence: 99%

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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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“…DiNaro et al [10] investigated the SCWO of benzene at temperature ranging from 479 • C to 587 • C with initial benzene concentration from 0.4 to 1.2 mmol/L. Complete conversion of benzene with stoichiometric oxygen at 246 bar was achieved only when the temperature was higher than 575 • C. Pinto et al [11] conducted a series of SCWO experiments on quinoline with the concentration of about 0.3mmol/L, indicating that 100% TOC removal was not achieved until the temperature approached 650 • C. Also the research on DBU(1,8-diazabicyclo [5.4.0]undec-7-ene) by Al-Duri et al [12] has shown that temperature is the main factor enhancing the oxidation.…”

Section: Introductionmentioning

confidence: 99%

Supercritical water oxidation of quinoline with moderate preheat temperature and initial concentration

Ren

Wang

Yang

et al. 2019

Fuel

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This work reports an experimental study on supercritical water oxidation of quinoline. Moderate preheat temperature (420 • C-510 • C) and initial concentration (1wt%-10wt%) are selected to address the possibility of utilizing the heat released during the reaction, in order to realize high conversion rate at relatively low preheat temperature. The effects of temperature, residence time, oxidation ratio, pressure and concentration are analyzed. The results show that considerable conversion can happen at relatively low preheat temperature, while increase in temperature will significantly promote the complete conversion. The yield of carbon dioxide increases with the residence time but there is an upper limit due to the stronger dependence on oxidizer concentration, for which an estimated reaction order is 1.90. When the quinoline concentration is larger than 8wt%, clear exothermic peaks with temperature rise about 100 • C are detected. These exothermic peaks can be interpreted as a sign of ignition interrupted by the heat loss to the surrounding salt bath. An analogy is made between the start temperatures of these exothermic peaks and the ignition temperatures reported in methanol and isopropanol hydrothermal flame research. We conclude that quinoline solutions can be ignited without co-fuels, at comparable ignition temperature as methanol and isopropanol around 450 • C.

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“…Density and dielectric constant of water beyond the critical point decrease, and this in turn determines high solubility of a huge group of non-polar compounds in water, including gases and organic compounds. At the same time the loss of polarity causes that compounds with an ionic structure practically do not dissolve in it any longer [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

The effect of thermohydrolysis on biological properties of selected chemical compounds

Janas

Zawadzka

2017

E3S Web Conf.

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Abstract.One of the negative effects of the continuous development of civilization which is observed in recent decades is an increase in the number and variety of pollutants released into the environment. These substances have ecotoxic properties and pose a serious threat to humans and proper functioning of the ecosystem. Their presence in the environment forces the development of new pollution control techniques. One of the latest and very promising methods to destroy organic contaminants using the properties of water which exceeded the critical point is thermohydrolysis in supercritical water. The aim of this study was to investigate thermohydrolysis in supercritical water conditions and to check its suitability for removal of hardly biodegradable organic compounds present in wastewater. Tests for toxicity of these compounds to aquatic organisms such as sewage bacteria, crustaceans and guppy fish were also performed and the degree of their biological decomposition was determined. Biological studies were carried out on starting compounds and after the processes of thermohydrolysis. The research material included p-nitrotoluene sulfonic acid (PNTS), 4,4'-dinitrostilbene-2,2'-disulfonic acid (DNSDS) and 4,4'-diaminostilbene-2,2'-disulfonic acid (DASDS). The research leads to the conclusion that the reactions occurring during hightemperature thermohydrolysis of the three tested compounds are extremely complex. Results of biological studies indicate a significant decrease in toxicity and increase in the biodegradability of products obtained after the process of thermohydrolysis.

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Supercritical water oxidation (SCWO) for the removal of N-containing heterocyclic hydrocarbon wastes. Part I: Process enhancement by addition of isopropyl alcohol

Cited by 46 publications

References 17 publications

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

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

Supercritical water oxidation of quinoline with moderate preheat temperature and initial concentration

The effect of thermohydrolysis on biological properties of selected chemical compounds

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