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Showing 1 to 20 of 67 for “"supercritical water"”.
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Supercritical Water Gasification of Biomass
… can be overcome by a novel technology: supercritical water gasification (SCWG). SCWG is based on reacting biomass with water above its critical point (T > 374.1°C; P > 22.1 MPa). Thanks to the unique properties of supercritical water, high gaseous yields can be achieved, as well as …
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Development of a heat-transfer correlation for supercritical water in supercritical water-cooled reactor applications
… analyzed and a new heat-transfer correlation for supercritical water was developed. This experimental dataset was obtained within conditions similar to those for proposed SuperCritical Water-cooled nuclear Reactor (SCWR) concepts. Thus, this new correlation, for forced convective heat transfer in …
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Supercritical water gasification of waste residues
… conversion of motor oil as a model compound, in supercritical water. Used motor oil was identified as a main waste compound leading to increased land fill concerns and supercritical water gasification is introduced as a method of decomposing such waste residues with high efficiencies. This study …
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Supercritical Water desulfurization of crude oil
Supercritical Water (SCW) desulfurization was investigated for both model sulfur compounds and Arab Heavy crude. In part 1, the reactions of alkyl sulfides in SCW were studied. During hexyl sulfide decomposition in SCW, pentane and CO+CO₂ were detected in addition to the expected six-carbon …
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Stability analysis of supercritical water cooled reactors
The Supercritical Water-Cooled Reactor (SCWR) is a concept for an advanced reactor that will operate at high pressure (25MPa) and high temperature (500°C average core exit). The high coolant temperature as it leaves the reactor core gives the SCWR the potential for high thermal efficiency (45%). …
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An evaluation of supercritical water oxidation technology
Water exists in a supercritical state above its supercritical temperature, 374.2 °C, and pressure, 22.1 :MPa. When organic waste is placed in a reactor with supercritical water, the vaporization, oxidation, and destruction of the organic compounds is achievable in a short time span, typically less …
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Molecular dynamics and self-diffusion in supercritical water
Supercritical water (SCW) which exists beyond the critical point (Tc=647.2K, Pc=221bar) is an innovative solvent to dissolve organic material. Many applications of this new solvent such as oxidation of organic wastes and separation of metals have been researched; however, the properties of SCW have …
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The effect of supercritical water on crude glycerin solution
… conventional biodiesel process, was reacted in supercritical water using a specially designed Haynesʼ Alloy 282 reactor system for the production of hydrogen rich syngas. The effects of temperature, pressure, water-to-carbon molar ratio, reactor residence time, and glycerin-to-methanol weight …
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Catalytic supercritical water oxidation of nitrogen-containing organic compounds
The results of the catalytic oxidation in supercritical water of two non-biodegradable and highly toxic nitrogen-containing organic compounds (DBU and quinoline) are presented. The reactions were studied in a tubular xed-bed reactor over three catalysts: Pt/Al\(_2\)O\(_3\), CuO/Al \(_2\)O\(_3\) and …
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Fundamental oxidation kinetics of simple compounds in supercritical water
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1990.
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Investigations on hydrodesulfurization reactions using slurry catalysts and supercritical water
… than the majority of the tested catalysts. Supercritical water, as very cheap additive, supported solely conversion reactions yielding large amounts of oil, while leaving a high sulfur residue behind. Investigations on sulfur containing model compounds underlined the absence of …
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Supercritical water gasification of lignocellulosic biomass materials for hydrogen production
The primary aim of this research is to optimize supercritical water gasification process operating conditions and develop a cost effective heterogeneous catalyst to reduce reaction temperature and improve H2 yield. Furthermore, a detailed techno- economic feasibility study was performed to evaluate …
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Phase behavior of inorganic salts in sub- and supercritical water
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1998.
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Study on heat transfer to supercritical water in application to SMRs
… a small modular reactor (SMR) concept with a supercritical water coolant, was subjected to a thermalhydraulic analysis and an economic analysis of its Levelized Unit of Energy Cost (LUEC). Heat transfer data was examined for the onset of deteriorated heat transfer using three correlations that …
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Homogeneous Catalysis in the Oxidation of P-Chlorophenol in Supercritical Water
… catalyzed oxidation of p-chlorophenol in water near the critical point. The temperatures and pressures studied range from 310$\sp\circ$C to 400$\sp\circ$C and 75 to 240 atm, respectively. The rate expression for the disappearance of chlorophenol appears to be first order in the organic at …
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Exposure and Characterization of Candidate Materials for Use in Supercritical Water Reactors
The use of supercritical water as the heat transfer medium between a power source and the steam generating system lead to an increase in thermodynamic efficiency. Supercritical water systems have already been employed in fossil fuel power generation, and a proposed Gen IV nuclear reactor is …
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Oxidation and hydrolysis reactions in supercritical water : chlorinated hydrocarbons and organosulfur compounds
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1995.
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Forced convective heat transfer to supercritical water in micro-rocket cooling passages
An investigation of heat transfer to supercritical fluids in micro-channels was completed to assess the cooling characteristics of the MIT micro-rocket engine. Previous results from supercritical ethanol heat transfer tests were compared to water tests to establish a baseline for future fuel …
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Oxidation chemistry and kinetics in supercritical water : hydrogen, carbon monoxide, and glucose
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1993.
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