Topic
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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Patent•
02 Aug 1978
TL;DR: In this article, the first chemical reactions of a Wet Air Oxidation (WAO) taking place in the presence of a large amount of water at temperatures of 175° C. to 325° C and pressures of 10 to 100 atmospheres were described.
Abstract: Peat, lignite, coal, many forms of biomass (land or marine) and solid wastes may have from 1/2 to 30 times as much water associated with the dry solids. Some of this water may be chemically bound or otherwise may be practically inseparable by mechanical means. The solids may be partially oxidized by oxygen or air in the first chemical reactions of a Wet Air Oxidation (WAO) taking place in the presence of the large amount of water at temperatures of 175° C. to 325° C. and pressures of 10 to 100 atmospheres--preferably 240° to 300° C. and 70 to 100 atmospheres. All sulfur in high sulfur coal is oxidized selectively to the sulfate radical; and heat to bring the combustible up to the necessary temperature is supplied by burning part of the combustible itself. The sulfur free coal may be used as conventionally. Residual solids (now 70 to 95% of the original fuel) have a higher heating value on a dry basis, and are mechanically separated from all but 1/2 to 2 pounds of water. These solids come from the dewatering unit at a high pressure and may be passed, without loss of pressure or temperature, to be gasified in conventional processes and gasifiers, again by partial oxidation.
19 citations
TL;DR: A new way to obtain carboxyl-rich activated carbon with large surface area and better adsorption capacity is provided, which will have high potential application in water remediation which requires pre-heating and emergency water treatment in the wild.
19 citations
TL;DR: In this paper, the authors conducted a wet air oxidation with 1.5% Pt/Al 2 O 3 and 1.1% CeO 2 catalysts and found that carbonaceous materials were formed and deposited on the catalyst surface and deactivated the catalysts.
19 citations
TL;DR: In this paper, multi-walled carbon nanotubes (MWCNTs), functionalized by O3, were used as catalysts in the absence of any metals to investigate the catalytic activity in catalytic wet air oxidation (CWAO) of phenol, nitrobenzene (NB) and aniline in a batch reactor.
Abstract: Wet air oxidation (WAO) is one of effective technologies to eliminate hazardous, toxic and highly concentrated organic compounds in the wastewater. In the paper, multi-walled carbon nanotubes (MWCNTs), functionalized by O3, were used as catalysts in the absence of any metals to investigate the catalytic activity in the catalytic wet air oxidation (CWAO) of phenol, nitrobenzene (NB) and aniline at the mild operating conditions (reaction temperature of 155°C and total pressure of 2.5 MPa) in a batch reactor. The MWCNTs were characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM), gas adsorption measurements (BET), fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). The functionalized MWCNTs showed good catalytic performance. In the CWAO of phenol over the functionalized MWCNTs, total phenol removal was obtained after 90 min run, and the reaction apparent activation energy was ca. 40 kJ·mol−1. The NB was not removed in the CWAO of single NB, while ca. 97% NB removal was obtained and 40% NB removal was attributed to the catalytic activity after 180 min run in the presence of phenol. Ca. 49% aniline conversion was achieved after 120 min run in the CWAO of aniline.
19 citations
Patent•
11 Aug 1981
TL;DR: In this paper, the authors proposed a method of heavy oil recovery from deep formations using in-situ wet oxidation steam generation, and a generator for such purpose, comprising a feed for a coal/water slurry and a feed of oxidative gas from ground level to the formation, forming a cavity in the formation where the sluration and gas meet for "wet oxidation" under the inherent pressures and temperature of the deep cavity, augmented by pressurizing the feeds and, if necessary by use of a primary ignitor, to generate carbon dioxide and steam which forces the heavy oil
Abstract: Method of heavy oil recovery from deep formations using in-situ wet oxidation steam generation, and a generator for such purpose, comprising a feed for a coal/water slurry and a feed of oxidative gas from ground level to the formation, forming a cavity in the formation where the slurry and gas meet for "wet oxidation" under the inherent pressures and temperature of the deep cavity, augmented by pressurizing the feeds and, if necessary by use of a primary ignitor, to generate carbon dioxide and steam which forces the heavy oil through one or more producing regions located in the formation in the neighborhood of the cavity. Packing may be set in place above the formation to limit escape of productive gas products of the wet oxidation.
19 citations