Efficiency of H2O2 and O2 in supercritical water oxidation of 2,4-dichlorophenol and acetic acid

Lee, Dong‐Soo; Gloyna, Earnest F.; Li, Lixiong

doi:10.1016/0896-8446(90)90030-p

Cited by 95 publications

(74 citation statements)

References 14 publications

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“…When hydrogen peroxide is injected into the reactor at 20°C, we evidence that H 2 O 2 is a better oxidant than oxygen, as previousely published [97], and when the degradation of H 2 O 2 takes place into the reactor, conversion rates are higher at the same temperature. The mechanism of organic molecule degradation by hydrogen peroxide seems to have an initiation step in which OH radicals are generated, and contribute to decrease the activation energy of the global reaction.…”

Section: Model Compoundssupporting

confidence: 64%

“…Several teams have worked on kinetics and degradation mechanisms, for specific reactions with model compounds. Many model molecules have been studied, such as carbon monoxide, methanol, ethanol and ammonia [93,94,95], p-chlorophenol [96], acetic acid and 2,4 dichlorophenol [97], phenol [98] and sugars and cellulose [94,99,100]. The organic and oxidant orders of the global reaction and the activation energy have been determined.…”

Section: Model Compoundsmentioning

confidence: 99%

See 1 more Smart Citation

Thermodynamic Aspects of Supercritical Fluids Processing: Applications of Polymers and Wastes Treatment

Cansell

Rey

Beslin

1998

Rev. Inst. Fr. Pét.

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La mise en Ïuvre des fluides supercritiques est d'un intŽr•t croissant dans de nombreux domaines : pour la sŽparation (sŽparation et purification en pŽtrochimie, industrie alimentaire) et la chromatographie par fluides supercritiques (sŽparation analytique et prŽ-paratoire, dŽtermination des propriŽtŽs physicochimiques), comme milieux rŽactifs aux propriŽtŽs continžment ajustables allant du gaz au liquide (polyŽthyl•ne de faible densitŽ, Žlimination des dŽchets, recyclage des polym•res), en gŽologie et en minŽralogie (volcanologie, Žnergie gŽothermique, synth•se hydrothermique), dans la formation des particules, fibres et substrats (produits pharmaceutiques, explosifs, rev•tements), pour le sŽchage des matŽriaux (gels).Cet article prŽsente les propriŽtŽs physicochimiques exceptionnelles des fluides supercritiques en rapport avec leurs applications en ingŽnierie. Apr•s un bref rappel des concepts fondamentaux relatifs au comportement critique des fluides purs, nous dŽvelop-pons d'une mani•re plus dŽtaillŽe les propriŽtŽs physicochimiques ajustables des fluides dans le domaine supercritique. La deuxi•me partie de lÕarticle dŽcrit les applications en ingŽnierie des fluides supercritiques relatives aux rŽactions chimiques et au traitement des polym•res. Chaque prŽsentation d'application est divisŽe en deux parties : la premi•re rappelle les concepts de base et le contexte gŽnŽral ainsi que les propriŽtŽs physicochimiques, la seconde dŽveloppe les applications en ingŽnierie se rapportant au domaine concernŽ. THERMODYNAMIC ASPECTS OF SUPERCRITICAL FLUIDS PROCESSING: APPLICATIONS TO POLYMERS AND WASTES TREATMENTSupercritical fluid processes are of increasing interest for many fields: in supercritical fluid separation (petroleum-chemistry separation and purification, food industry) and supercritical fluid chromatography (analytical and preparative separation, determination of physicochemical properties); as reaction media with continuously adjustable properties from gas to liquid (lowdensity polyethylene, waste destruction, polymer recycling); in This paper presents the unusual physicochemical properties of supercritical fluids in relation to their engineering applications. After a short report of fundamental concepts of critical behavior in pure fluids, we develop in more details the tunable physicochemical properties of fluid in the supercritical domain. The second part of this paper describes the engineering applications of supercritical fluids relevant of chemical reactions and polymer processing. Each application presentation is divided in two parts: the first one recalls the basic concepts including general background, physicochemical properties and the second one develops the engineering applications relevant of the advocated domain. ASPECTOS TERMODINçMICOS DEL TRATAMIENTO DE LOS FLUIDOS SUPERCRêTICOS : APLICACIONES PARA LOS TRATAMIENTOS DE LOS POLêMEROS Y DE LOS RESIDUOSLa implementaci-n de los fluidos supercr'ticos presenta un interŽs cada vez mayor en numerosos campos : para la separaci-n (separaci-n y purific...

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Section: Model Compoundssupporting

confidence: 64%

Section: Model Compoundsmentioning

confidence: 99%

Thermodynamic Aspects of Supercritical Fluids Processing: Applications of Polymers and Wastes Treatment

Cansell

Rey

Beslin

1998

Rev. Inst. Fr. Pét.

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“…Acetic acid was singled out as the key organic intermediate because it is a frequent product of wet-air oxidation. Further, kinetics studies showed that acetic acid oxidized more slowly than some other organic compounds (Lee et al, 1990). We note, however, that there are conflicting reports (Wightman, 1981;Rice et al, 1993) showing that the reactivity of acetic acid exceeds that of several other organics.…”

Section: Products and Pathwaysmentioning

confidence: 96%

“…Kodra and Balakatoiah (1992) recently modeled this type of deep-well reactor. Air or 0, are the most common oxidants used in SCWO, but H,O,, KMnO,, Cu-H202, Fe-H,O,, and MnS0,-H,O, mixtures have also been explored as potential oxidants (Lee and Gloyna, 1992;Lee et al, 1990;Shanableh and Gloyna, 1991;Chang et al, 1993). Although these alternative oxidants are more costly than 0, or air, they may facilitate oxidation at lower temperatures, which could offset these higher costs.…”

Section: Oxidation Reactionsmentioning

confidence: 97%

Reactions at supercritical conditions: Applications and fundamentals

et al. 1995

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“…After treatment, the major component in MLSS was maybe changed to be a char in which orthophosphate was contained. Some other researchers also found that the refractory intermediates were produced in subcritical and supercritical water process (Lee et al, 1990). As a result, MAP process could recover about 95 % of the phosphate from the solubilized excess sludge.…”

Section: Analytical Parametersmentioning

confidence: 90%

Resource Recovery from Excess Sludge by Subcritical Water Process with Magnesium Ammonium Phosphate Process

Arakane

Imai

Murakami

et al. 2005

J. of Wat. & Envir. Tech.

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The amount of excess sludge produced in municipal wastewater treatment plants in Japan is increasing every year as the urban population increases. Phosphorus in excess sludge could be a potential phosphorus resource since at present, phosphate rock is being exhausted all over the world. Every year, Japan imports large quantities of phosphorus from abroad but much are discharged as excess sludge. Therefore, solubilization process, one method of recovering phosphorus from sludge, could be a promising solution. In this study, subcritical water process, a new technology that solubilizes sludge under subcritical condition, was applied before the phosphorus in sludge was recovered with magnesium ammonium phosphate (MAP) process. As a result, the solubilization rate of excess sludge achieved approximately 80% and about 94-97% of the phosphorus could be recovered.Keywords Subcritical water; Solubilization; Excess sludge; Resources recovery; MAP process Introduction Activated sludge (AS) process is the most commonly used biological treatment process for municipal wastewater treatment plants all over the world. However, one of its major disadvantages is the high production of excess sludge. Every year about 2000 million tons of excess sludge are to be treated in Japan, accounting for approximately 48 % of the total amount of industrial solid waste, and this number is still increasing with the increase in urban population (Environmental white paper, 2005). Although recently, excess sludge is being increasingly used for soil amendment or construction materials, this part takes only about 45 % of the total, and the residual part has to be dewatered, incinerated and then landfilled. Because the area for landfill is becoming less and less available in Japan, new treatment methods and disposal technologies, as well as effective utilization, are strongly expected. In this study, a new method of applying subcritical water to hydrolyze and solubilize excess sludge, as shown in Figure 1, was examined. In addition, UASB process for methane recovery and MAP process for nitrogen and phosphorus recovery from the solubilized excess sludge were also investigated.

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Efficiency of H2O2 and O2 in supercritical water oxidation of 2,4-dichlorophenol and acetic acid

Cited by 95 publications

References 14 publications

Thermodynamic Aspects of Supercritical Fluids Processing: Applications of Polymers and Wastes Treatment

Thermodynamic Aspects of Supercritical Fluids Processing: Applications of Polymers and Wastes Treatment

Reactions at supercritical conditions: Applications and fundamentals

Resource Recovery from Excess Sludge by Subcritical Water Process with Magnesium Ammonium Phosphate Process

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