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Support effects on the chemical property and catalytic activity of Co-Mo HDS catalyst in sulfur recovery

Journal of Natural Gas Chemistry 2010年第1期19卷 91-95页

作者： Ali Nakhaei Pour Ali Morad Rashidi Kherolah Jafari Jozani Ali Mohajeri Payman Khorami Research Institute of Petroleum Industry of National Iranian Oil Company P. O. Box 114665-137 Tehran Iran

Effects of carbon nanotubes （CNT） and alumina （γ-Al2O3） supports on the catalytic activities of hydrodesulfurization （HDS） process over Co- Mo catalyst have been studied. XRD results indicated that the main active phases in CNT and γ-Al2O3 supported Co-Mo catalysts are MoO2 and MOO3, respectively. The TPR results reveal that the reduction peak temperatures of the active species on CNT supported Co-Mo catalyst is lower than those on alumina supported Co-Mo catalyst, indicating that the CNT supports favor the reduction of active species. Catalytic evaluation results displayed that the sulfur content in the reaction products on the CNT supported Co-Mo catalyst is lower than that on the alumina supported Co-Mo catalyst if the HDS reaction was carried out at a temperature above 583 K.

关键词： sulfur recovery Co-Mo catalyst carbon nanotubes HDS process

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An investigation of reaction furnace temperatures and sulfur recovery

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Frontiers of Chemical Science and Engineering 2011年第3期5卷 362-371页

作者： S.ASADI M.PAKIZEH M.POURAFSHARI CHENAR Chemical Engineering Department Faculty of EngineeringFerdowsi University of MashhadMashhad P.O.Box 91775-1111Iran

In a modern day sulfur recovery unit(SRU),hydrogen sulfide(H_(2)S)is converted to elemental sulfur using a modified Claus unit.A process simulator called TSWEET has been used to consider the Claus process.The effect of the H_(2)S concentration,the H_(2)S/CO_(2) ratio,the input airﬂow rate,the acid gasﬂow of the acid gas(AG)splitter and the temperature of the acid gas feed at three different oxygen concentrations(in the air input)on the main burner temperature have been studied.Also the effects of the tail gas ratio and the catalytic bed type on the sulfur recovery were studied.The bed temperatures were optimized in order to enhance the sulfur recovery for a given acid gas feed and air input.Initially when the fraction of AG splitterﬂow to the main burner was increased,the temperature of the main burner increased to a maximum but then decreased sharply when theﬂow fraction was further increased;this was true for all three concentrations of oxygen.However,if three other parameters(the concentration of H_(2)S,the ratio H_(2)S/CO_(2) and theﬂow rate of air)were increased,the temperature of the main burner increased monotonically.This increase had differ-ent slopes depending on the oxygen concentration in the input air.But,by increasing the temperature of the acid gas feed,the temperature of the main burner decreased.In general,the concentration of oxygen in the input air into the Claus unit had little effect on the temperature of the main burner(This is true for all parameters).The optimal catalytic bed temperature,tail gas ratio and type of catalytic bed were also determined and these conditions are a minimum temperature of 300°C,a ratio of 2.0 and a hydrolysing Claus bed.

关键词： Claus unit concentration of H_(2)S tail gas ratio sulfur recovery catalytic bed

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Regeneration of Fe_(2)O_(3)-based high-temperature coal gas desulfurization sorbent in atmosphere with sulfur dioxide

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Frontiers of Chemical Science and Engineering 2010年第4期4卷 423-428页

作者： Ruizhuang ZHAO Ju SHANGGUAN Yanru LOU Jin SONG Jie MI Huiling FAN Key Laboratory of Coal Science and Technology (Ministry of Education and Shanxi Province)Taiyuan University of TechnologyTaiyuan 030024China

Regeneration of a high-temperature coal gas desulfurization sorbent is a key technology in its industrial applications.A Fe_(2)O_(3)-based high-temperature coal gas desulfurizer was prepared using red mud from steel factory.The influences of regeneration temperature,space velocity and regeneration gas concentration in SO_(2) atmosphere on regeneration performances of the desulfurization sorbent were tested in a fixed bed reactor.The changes of phase and the composition of the Fe_(2)O_(3)-based high-temperature coal gas desulfurization sorbent before and after regeneration were examined by X-ray diffraction(XRD)and X-ray Photoelectron spectroscopy(XPS),and the changes of pore structure were characterized by the mercury intrusion method.The results show that the major products are Fe3O4 and elemental sulfur;the influences of regeneration temperature,space velocity and SO_(2) concentration in inlet on regeneration performances and the changes of pore structure of the desulfurization sorbent before and after regeneration are visible.The desulfurization sorbent cannot be regenerated at 500℃ in SO_(2) atmosphere.Within the range of 600℃-800℃,the time of regeneration becomes shorter,and the regeneration conversion increases as the temperature rises.The time of regeneration also becomes shorter,and the elemental sulfur content of tail gas increases as the SO_(2) concentration in inlet is increased.The increase in space velocity enhances the reactive course;the best VSP is 6000 h^(-1) for regeneration conversion.At 800℃,20 vol-%SO_(2) and 6000 h^(-1),the regeneration conversion can reach nearly to 90%.

关键词： high-temperature coal gas Fe_(2)O_(3)desulfurization sorbent SO_(2)atmosphere regeneration behaviors sulfur recovery

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英文摘要

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石油与天然气化工 2012年第3期41卷 357-362页

The article presents abstracts of papers on chemical engineering of oil and gas, including a traceable calibration procedure for hydrocarbon dew point chilled mirror instruments and research direction and challenges f... 详细信息

关键词： acidizing air oxidation amine value ammonia or ammonium salt analysis anti-swelling agent anti-swelling performance anti-swelling rate anticorrosion coating ASP produced water average particle size bimodal calibration casing--damaged well catalyst cement chimney clay minerals CO2 comparison research complex gas components core damage corrosion inhibitor CPS crude sewage desulphurization determination diversion ejector energy development energy efficiency benchmarking evaluation FCC foam drainage foam mass foam stabilizer foamed acid foaming agent function design Gas field gathering pipelines H2S high temperature high-sulfur hydrocarbon dew point hydrocarbon dew point chilled mirror instruments incinerator inspection integrated equipment kinetic hydrateinhibitors LaFeO3 liquefied petroleum gas dispenser liquid loading load low permeability and low pressure LPG mechanical strength methane methane hydrates metrological verification microbial flocculant multifunctional activated acid natural gas natural gas desulfurization natural gas hydrate network management platform new technology offshore oilfield oil yield oilfield application operation operation points parameter optimization performance evaluation perovskite oxide compound plugging plugging causes analysis polymer polymer-surfactant displacement pore distribution prevention measures removal rate of solid suspensions replacement rate response of performance retarder rotating-strip-port round-port scale inhibitor scaling screening silica gel slight expansion SO2 solid-liquid separation treatment solubilization sour gas field sulfur recovery system construction tail gas treatment hydro-treating heater technical summary thermodynamics titration method traceability transport pipeline treatment technology uncertainty of measurement viscosity waste drilling fluid water content water injection water producing water sensitivity damage water-sensitivity

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