Chemical desulfurization of petroleum fractions for ultra-low sulfur fuels

Ali, Mohammad Farhat; Al-Malki, Abdullah; Ahmed, Shakil

doi:10.1016/j.fuproc.2009.01.005

Cited by 61 publications

(33 citation statements)

References 6 publications

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“…The suspension was filtered and residue was collected, dried and then calcined for 4 h under air at 500˚C. VO x /ZSM-5 was prepared using Na 3 VO 4 and WO x /ZSM-5 by using Na 2 WO 4 as precursors, through similar process. During synthesis of WO x /ZSM-5, pH was adjusted to 9, with NaOH solution.…”

Section: Preparation Of Catalystmentioning

confidence: 99%

Desulphurization of Transportation Fuels by Per-Formic Acid Oxidant Using MoOx Loaded on ZSM-5 Catalyst

Peshawar¹,

Pakistan²

2017

JPEE

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Desulphurization of model and real oil samples was investigated using performic acid as oxidant assisted by air as co-oxidant. The catalysts used were Mo-oxide supported on ZSM-5 zeolite, which was synthesized in the laboratory and characterized by FT-IR, XRD, SEM and SSA analysis. In case of model oil, the optimum condition determined for complete oxidation of all the model compounds including thiophene, DBT and 4,6-DMDBT were; 60˚C, 60 min, ambient pressure and air flow rate of 100 mL/min. The oxidation reactivity decreased from 4,6-DMDBT to DBT and thiophene, which was found to follow pseudo first order kinetics. The real oil sample used in the study included untreated naphtha (NP), light gas oil (LGO), heavy gas oil (HGO) and Athabasca bitumen (Bit.). In case of NP and LGO the sulfur removal of above 78% was attained whereas in case of HGO and Bit. samples about 60% of desulfurization was achieved.

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Section: Preparation Of Catalystmentioning

confidence: 99%

Desulphurization of Transportation Fuels by Per-Formic Acid Oxidant Using MoOx Loaded on ZSM-5 Catalyst

Peshawar¹,

Pakistan²

2017

JPEE

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“…Os sulfetos são oxidados mais rapidamente pelo fato das mercaptanas precisarem ser primeiro oxidadas a sulfetos e/ou dissulfetos para depois chegarem a sulfóxidos e sulfonas. Tendo em vista o maior peso molecular e polaridade, esses compostos são adsorvidos com maior facilidade (Ali et al, 2009). …”

Section: Figura 1 -Curvas De Breakthrough Para O Tetrahidrotiofeno E unclassified

Dessulfurização Do Gás Natural Por Adsorção Com Carbonos Ativados Modificados

Aguiar¹,

Guimaraes²,

Coelho³

2017

Blucher Chemical Engineering Proceedings

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ácido nítrico frente a sete compostos de enxofre presentes em uma amostra de gás natural sintetizada foi avaliado. Os dois métodos de modificação melhoraram a capacidade de adsorção. Após a impregnação com ferro, o composto que obteve maior aumento da capacidade de adsorção foi o tercbutilmercaptana (TBM), e com o carbono ativado oxidado pelo HNO3 foi o metiletilsulfeto (DMS). INTRODUÇÃOCom diversas aplicações na indústria e outros setores, o gás natural é uma importante fonte de energia, além de ser a principal matéria-prima em vários segmentos da indústria química. Entretanto, problemas como o envenenamento de catalisadores, corrosão de equipamentos e entre outros, podem advir de compostos organosulfurados presentes na composição desse combustível fóssil (Malvesti et al., 2009).Com a gradativa necessidade de emissões mais limpas por parte dos órgãos ambientais, novas tecnologias tendo em vista à remoção adicional de enxofre mediante processos de adsorção vêm sendo estudadas. Uma técnica promissora, menos complexa e de alta eficiência, porém o adsorvente utilizado necessita ter elevada área superficial e propriedades texturais que contribuam no desempenho cinético e de equilíbrio de adsorção (Ruthven,1984). O carbono ativado é um dos principais adsorventes empregados em processos adsortivos devido a sua estrutura de poros bem desenvolvida, área superficial e dos grupos funcionais em sua superfície (Cooney, 1999).Estudos recentes analisam métodos de modificação para adaptar e alterar propriedades físicas e químicas na superfície do carbono ativado. Segundo Cui e colaboradores (2008), resultados superiores são obtidos provenientes da modificação de adsorventes. Quer por oxidação, geralmente com um ácido forte, sulfúrico ou nítrico ou por impregnação com cloreto de ferro III. Tais alterações adicionam mais grupos ácidos à superfície e formam locais de adsorção ativos na superfície do carbono, respectivamente, favorecendo reações de oxidação/adsorção.

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“…Formic acid could effectively enhance the oxidation because it acts as a cocatalyst in oxidation system and not only decreases the pH value of the aqueous phase, but also generates performic acid when it interacts with hydrogen peroxide. In addition to the polarization ability of O-O bond, oxidative catalytic feature of formic acid has been reported as an oxidizing agent by giving its oxygen atom to DBT and enhancing its conversion to sulfones and sulfoxides species [4,5]. In addition, the small size of the formic acid molecule can facilitate its interaction with sulfur without any steric hindrance of alkyl groups.…”

Section: Effect Of O/s Molar Ratiomentioning

confidence: 99%

“…In the first step, sulfur-containing compounds are oxidized by an oxidizing agent such as hydrogen peroxide to their corresponding sulfones or sulfoxides. At the second stage, these highly polarized products are removed from the fuels by adsorption or liquid-liquid extraction [4,5]. Various oxidation systems for ODS process with different oxidants and catalysts have been employed, such as H 2 O 2 /acetic acid [6][7][8], H 2 O 2 /formic acid [4,9,10], H 2 O 2 /heterogeneous catalysts [11][12][13], H 2 O 2 /ionic liquid [14,15] oxygen/aldehyde [16], ozone/heterogeneous catalysts [17], and tert-butyl hydroperoxide/heterogeneous catalysts [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Influential Parameters in Deep Oxidative Desulfurization of Dibenzothiophene with Hydrogen Peroxide and Formic Acid

Mamaghani

Fatemi

Asgari

2013

International Journal of Chemical Engineering

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An effective oxidative system consisting of hydrogen peroxide, formic acid, and sulfuric acid followed by an extractive stage were implemented to remove dibenzothiophene in the simulated fuel oil. The results revealed such a great performance in the case of H 2 O 2 in the presence of formic and sulfuric acids that led to the removal of sulfur compounds. Sulfuric acid was employed to increase the acidity of media as well as catalytic activity together with formic acid. The oxidation reaction was followed by a liquid-liquid extraction stage using acetonitrile as a polar solvent to remove produced sulfones from the model fuel. The impact of operating parameters including the molar ratio of formic acid to sulfur (n F /n S ), hydrogen peroxide to sulfur (n O /n S ), and the time of reaction was investigated using Box-Behnken experimental design for oxidation of the model fuel. A significant quadratic model was introduced for the sulfur removal as a function of effective parameters by the statistic analysis.

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Chemical desulfurization of petroleum fractions for ultra-low sulfur fuels

Cited by 61 publications

References 6 publications

Desulphurization of Transportation Fuels by Per-Formic Acid Oxidant Using MoOx Loaded on ZSM-5 Catalyst

Desulphurization of Transportation Fuels by Per-Formic Acid Oxidant Using MoOx Loaded on ZSM-5 Catalyst

Dessulfurização Do Gás Natural Por Adsorção Com Carbonos Ativados Modificados

Investigation of Influential Parameters in Deep Oxidative Desulfurization of Dibenzothiophene with Hydrogen Peroxide and Formic Acid

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