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Wet oxidation

About: Wet oxidation is a research topic. Over the lifetime, 3094 publications have been published within this topic receiving 61536 citations.


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Journal ArticleDOI
TL;DR: In this article, the authors evaluated a plausible pretreatment for rice straw based on the 23-factorial experimental design with a goal to reduce biomass recalcitrance by enhancing the cellulose recovery, hemicellulose solubilization, lignin removal and concomitantly generating limited degradation products.
Abstract: Biomass recalcitrance is considered to be one of the impediments in bioconversion of lignocellulosic biomass (LCB) to sugars. Rice straw, a potential lignocellulosic waste, owing to the surplus availability, renewability and high carbohydrate content was used as a model LCB in the present study. The alkaline hydrogen peroxide-assisted wet air oxidation (APWAO) was evaluated as plausible pretreatment for rice straw based on the 23—factorial experimental design with a goal to reduce biomass recalcitrance by enhancing the cellulose recovery, hemicellulose solubilization, lignin removal and concomitantly generating limited degradation products. APWAO resulted in an overall cellulose recovery ranging from 80.54 to 93.02%, hemicellulose solubilization of 36.44–82.08% and lignin removal of 65.95–81.11% (all on w/w basis) respectively and absence of potent inhibitors viz. furfural and 5-hydroxymethylfurfural. The statistically significant pretreatment factors that affected each of these responses were assessed and optimum pretreatment conditions were determined to be biomass soaking in 0.5% H2O2 for 14 h succeeded by wet air oxidation (WAO) at 190 °C, 6 bar, 20 min by multi-objective numerical optimization. Further, the morphological and structural changes occurring as a result of pretreatment were scrutinized using SEM and FT-IR. APWAO further ensued in enhanced cellulose accessibility during enzymatic saccharification indicated by the glucose yield ranging from 113.97 to 200.34 g/kg untreated rice straw. Thus, the combined pretreatment (APWAO) i.e. pre-soaking in alkaline H2O2 followed by WAO was shown to enhance glucose yields owing to significant delignification.

20 citations

Journal ArticleDOI
TL;DR: Wet electrolytic oxidation under mild condition was investigated and it was found that this novel process showed synergistic effect for TOC removal compared with that by the individual WAO and EO, and presented much higher dye removal efficiency.

20 citations

Journal ArticleDOI
TL;DR: In this paper, a series of Pt-doped, tubular ceramic membranes were prepared by the evaporation-crystallization technique and the activity of these membranes was measured in the process of liquid-phase oxidation of aqueous formic acid solutions (0.2 −10g −L−1), carried out in a semi-batch three-phase reactor system by using air or oxygen.
Abstract: A series of Pt-doped, tubular ceramic membranes were prepared by the evaporation–crystallization technique. The activity of these membranes was measured in the process of liquid-phase oxidation of aqueous formic acid solutions (0.2–10 g L−1), carried out in a semi-batch three-phase reactor system by using air or oxygen. An influence of trans-membrane pressure difference, reaction temperature, catalyst loading, and re-circulation rate on the extent of formic acid removal was measured in a wide range of operating conditions. A mathematical model that captures essential physics of the process, was developed to predict concentration profiles of reactants within the membrane wall and the thickness of reaction zone. The calculations show that the productivity of membrane contactor is influenced by the concentration of dissolved oxygen in the reaction zone as well as by the molar ratio of reactants, the latter being dependent on formic acid conversion.

19 citations

Journal ArticleDOI
TL;DR: In this paper, the catalytic wet air oxidation (CWAO) of non-biodegradable industrial organic raffinate containing pyridine and its derivatives (β-picoline, 3-cyanopyridine) was carried out using MnOx/Al2O3 catalyst at atmospheric pressure.

19 citations

Patent
27 Jan 1988
TL;DR: In this article, the authors proposed a method for effecting accelerated oxidation reactions in a downhole or deep well wet oxidation apparatus, including the processing of aqueous organic waste, such as municipal sludge.
Abstract: The method of this invention is particularly, although not exclusively, adapted for effecting accelerated oxidation reactions in a downhole or deep well wet oxidation apparatus, including the processing of aqueous organic waste, such as municipal sludge. It includes injecting a multiple-phase composition which contains an oxygen or an oxygen-rich gas which is fully saturated with water vapor and which also contains water in the liquid phase into a wet oxidation reaction apparatus which contains an aqueous stream of combustible waste, preferably at the temperature and pressure of the waste stream at the point of injection. This reduces the likelihood of hazardous spontaneous combustion which may otherwise occur if dry spots are allowed to form in the reaction apparatus. The volume of water in the composition should be equal to at least twice the volume of water necessary to saturate the gas with water vapor to maintain at least 50 percent of the water in the liquid phase.

19 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202314
202233
202171
202096
2019116
2018128