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Showing 1 to 20 of 66 for “"desulfurization"”.
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Coal desulfurization with sodium hypochlorite
Wet desulfurization of Pittsburgh No. 8 coal and Illinois No. 6 coal were conducted with sodium hypochlorite in the laboratory. Pittsburgh No. 8 coal was leached by hypochlorite at high pHs in one step only. The hypochlorite concentration varied from 0.2 to 0.6 molar; sodium hydroxide …
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Mechanistic understanding of microbial desulfurization
… oil have motivated the development of alternate desulfurization technologies. Microbial desulfurization or biodesulfurization (BDS) has gained interest due to the ability of certain biocatalysts to desulfurize compounds that are recalcitrant to the currently employed hydrodesulfurization (HDS) …
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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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Modeling and optimization of microbial desulfurization processess
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1999.
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Desulfurization by reactive adsorption on oxide/metal composites
… were studied for high and low temperature desulfurization applications. In addition, the focus was on moving away from the traditional practice of using oxides only as support materials. Oxides have traditionally been assigned the role of support materials in applications involving …
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Models of high-temperature desulfurization using zinc-based sorbents
This study focuses on determining models that are currently available to describe gas-solid reactions to predict the observed (experimental) results from a series of TGA experiments. Variations of the GPM (Grainy Pellet Model) were used and shown to give good agreement with experimental conversion …
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Investigation of hot gas desulfurization utilizing a transport reactor
… transport reactor technology to conduct hot gas desulfurization (HGD). The need or market drivers for this technology were assessed to identify the demand and opportunity. A literature review was conducted to assess the status of HGD and the issues involved with its development.;Design …
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Hollow fiber sorbents for the desulfurization of pipeline natural gas
… in such applications. Packed bed technology for desulfurization suffers from several disadvantages including high pressure drop and slow regeneration rates that require large unit sizes. We describe a novel Rapid Temperature Swing Adsorption (RTSA) system utilizing hollow fibers with polymer …
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Evaluation of modified dry limestone process for flue gas desulfurization
… Dry Limestone Process (MDLP) for flue gas desulfurization. Two types of limestone, one calcitic and one dolomitic, were used. These materials were characterized by ICP analysis, X-ray diffraction, optical microscopy, SEM, and electron microprobe before and after reaction. Performance was …
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The utilization of aplite in ladle desulfurization of cast iron
The desulfurizing powers of aplite, aplite-soda ash mixtures, and aplite-dehydrated lime combinations when added to a ladle of cast iron were tested. Ladle conditions were simulated by melting cast iron in a crucible and introducing the reagent mixtures into the molten metal by means of a cast iron …
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Production of liquid and gaseous fuels from steam desulfurization of coal
The marketability of Illinois coal is severely limited by its high sulfur content. Burning high sulfur coal produces corrosion and pollution problems. Illinois No.6 coal, in particular, contains a high percentage of organic sulfur. Organic sulfur cannot be removed by physical means.
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Desulfurization of vacuum induction melted high strength steel: relation to mechanical properties
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Metallurgy, 1961.
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Electrospun nanofibrous metal oxides as regenerable adsorbents for desulfurization of biomass-derived syngas
… properties have been tried for high temperature desulfurization. However, in spite of numerous efforts to modify chemical and compositional properties, only a limited success has been achieved. It is due to sorbent's failure in meeting one or more of the aforementioned criteria. For instance, in …
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Precombustion desulfurization of coal by photochemical methods and pyrite depression in froth flotation
The precombustion desulfurization of coal was investigated by photochemical methods and by the application of a novel pyrite depressant in froth flotation. Semiconductor photoelectrochemical catalysis was extensively examined. As much as 41% of the organic sulfur was removed and 72% overall …
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Numerical modeling of cold flow and hot gas desulfurization in a circulating fluidized bed
Section I. This work was carried out to understand the behavior of the solid and gas phases in a CFB riser. Only the riser is modeled as a straight pipe. A model with linear algebraic approximation to solids viscosity of the form, mus = 5.34epsilons, (epsilon s is the solids volume fraction) with …
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Composition modification of zinc titanate (Zn₂TiO₄) based sorbents for hot coal gas desulfurization
Advanced power generation systems require regenerable sorbents capable of removing sulfur from coal gas to low ppm levels. Zinc titanate (Zn₂TiO₄) based sorbents are currently the leading sorbent for sulfur removal at high temperatures (~700°C). Zinc titanate sorbents are still in need of …
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Mathematical modeling of the fluid flow, multicomponent slag-metal reactions and desulfurization efficiency in gas-stirred ladles
… as well as the slag-metal reactions and desulfurization efficiency in the gas-stirred ladles. The volume of fluid (VOF) model, discrete phase model (DPM), and realizable k-ε model were applied to describe the argon/steel/slag/air multiphase evolution and the turbulent flow. The model was …
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