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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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07 Sep 1977TL;DR: In this paper, a process has been developed for the oxidation of organic substances, dissolved or dispersed in an aqueous system, with a gas containing molecular oxygen at elevated temperature and under elevated pressure chiefly to carbon dioxide and water, with subsequent phase separation of the reaction mixture into a gaseous phase substantially containing inert gas, carbon dioxide, steam and organic constituents and a liquid phase substantially including water.
Abstract: of the Disclosure A process has been developed for the oxidation of organic substances, dissolved or dispersed in an aqueous system, with a gas containing molecular oxygen at elevated temperature and under elevated pressure chiefly to carbon dioxide and water, with subsequent phase separation of the reaction mixture into a gaseous phase substantially containing inert gas, carbon dioxide, steam and organic constituents and a liquid phase substantially containing water, characterized in that the pressure is adjusted, at the given temperature, so that by evaporation of water from the aqueous system, more steam than the exotherm-icity of the oxidation reaction gives rise to,goes into the gaseous phase, which is fed to a heat exchanger in which the amount of heat required to maintain the oxidation temperature is completely or partially transferred to a mixture of water and a gas containing molecular oxygen, which mixture flows in on the other side of the heat exchanger and is subsequently fed to the reactor. A particular advantage of the process of the invention is that, in addition to the oxidation of organic substances, it is possible to fed inorganic constituents, after the oxidative degradation of the organic substances, to a re-use or recovery process.
49 citations
TL;DR: In this article, an ordered mesoporous carbon was synthesized by chemical vapor deposition using SBA-15 silica as solid template and propylene as carbon precursor, which was submitted to several liquid oxidation treatments by means of HNO3 and H2O2 under different oxidation conditions.
49 citations
TL;DR: In this article, the catalytic wet oxidation of phenol was studied in a slurry phase continuous stirred tank reactor (CSTR) using platinum on graphite support as a catalyst.
49 citations
TL;DR: In this article, aniline, phenol, carboxylic acids and ammonia were processed in a batch reactor over noble metals (Ru, Pd, Pt) supported on ceria.
Abstract: Catalytic wet air oxidation (CWAO) of aniline, phenol, carboxylic acids and ammonia was carried out in a batch reactor over noble metals (Ru, Pd, Pt) supported on ceria. Ruthenium is very active for the conversion of a wide range of organic compounds and selective into carbon dioxide. The ability of ceria to transfer oxygen is essential for good performances in CWAO. However, Ru/CeO2 is not selective for ammonia oxidation into N2. Addition of small amount of Pd enhances both activity and selectivity of Ru in this reaction. Finally, oxidation of nitrogenous organic compounds requires moderate temperature and oxygen pressure and needs to adjust the oxidizing capacity of the catalyst.
49 citations
TL;DR: In this article, the removal of organics from paper and pulp industrial waste was investigated employing wet oxidation and catalytic wet oxidation (CWO) techniques using a high-pressure reaction system.
Abstract: The removal of organics from paper and pulp industrial waste was investigated employing wet oxidation (WO) and catalytic wet oxidation (CWO) techniques using a high-pressure reaction system. Different types of catalysts prepared from single metals (transition/noble) and mixed metals (transition–transition/transition/noble metal) were used in the CWO studies. The paper and pulp liquor treatments were conducted in selected different environments such as (i) liquors with different organic concentrations, (ii) liquors with different pH (11–14), (iii) a range of reaction temperatures (413–463 K), (iv) different catalysts (Cu, Mn, Pd, Cu/Mn, Mn/Pd, Cu/Pd), (v) catalyst loading (1–8 g). The single transition (Cu, Mn) or noble metal (Pd) catalysts showed appreciable total organic removal, but the bi-metal catalysts (Cu/Mn, Cu/Pd, Mn/Pd ) exhibited even higher activity for organics removal. Much higher total organic carbon (TOC) removal (>84%) was achieved by using the CWO process. The TOC removed by the Cu/Pd catalyst was the highest, followed by the Mn/Pd and Cu/Mn catalytic system.
49 citations