Desulfurization of Vacuum Gas Oil Based on Chemical Oxidation Followed by Liquid−Liquid Extraction

Shiraishi, Yasuhiro; Hirai, Takayuki

doi:10.1021/ef0301396

Cited by 65 publications

(38 citation statements)

References 11 publications

(48 reference statements)

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“…Studies have shown that hydrogen peroxide appears to be a promising oxidizing agent in the catalyzed oxidation of sulfur compounds in fuels due to the fact that it offers a high amount of active oxygen and produces only water as a by-product. [18][19][20][21][22][23][24][25] The activity and selectivity of metal complexes immobilized on polymer microspheres have been reported in our previous studies to be as efficient as unsupported metal complexes. [26][27][28][29] In an attempt to improve the surface area of the polymeric support, electropsun polymer fibres have also been reportedly employed as an alternative.…”

Section: Introductionmentioning

confidence: 73%

The oxidation of dibenzothiophene using oxidovanadium(IV)-containing nanofibres as catalyst

OGUNLAJA,

HOSTEN,

TSHENTU

2015

S.Afr.j.chem

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Polyvinylbenzylchloride nanofibres were fabricated by the electrospinning technique and subsequently functionalized with a tetradentate ligand, 2,2'-(1E,1'E)-(1,2-phenylenebis(azan-1-yl-1-ylidene))bis(methan-1-yl-1-ylidene)bis(4-aminophenol). VO 2+ was then incorporated into the nanofibres to produce the catalyst VO-fibres. Microanalysis, TG and FT-IR were used for the characterization of VO-fibre, and EPR also confirmed the presence of oxidovanadium(IV) within the nanofibres. Oxidation of dibenzothiophene (DBT) was investigated by varying the catalyst amount, substrate amount, oxidant and temperature, and the progress of oxidation was followed with a gas chromatograph fitted with a flame ionization detector. An increase in the amount of oxidant caused an increase in the amount of dibenzothiophene sulfone (DBTO 2 ), while a decrease in the quantity of dibenzothiophene resulted in an increase in the overall yield of dibenzothiophene sulfone under a constant temperature and oxidant (H 2 O 2 ) concentration. Dibenzothiophene sulfone was confirmed as the oxidation product through 1 H-NMR spectroscopy and single crystal X-ray diffraction. KEYWORDSVanadium(IV) catalyst, nanofibres, dibenzothiophene, oxidation, hydrogen peroxide (H 2 O 2 ).

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Section: Introductionmentioning

confidence: 73%

The oxidation of dibenzothiophene using oxidovanadium(IV)-containing nanofibres as catalyst

OGUNLAJA,

HOSTEN,

TSHENTU

2015

S.Afr.j.chem

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“…The alkyl sulfide is a neutral liquid substance, and the disulfide has a poor stability. Both are prone to be oxidized to sulfoxide or sulfonic acid [17], and then removed by extractant. As shown in Table 3, alkylthiophene (96.18 %), benzothiophene (42.95 %) and dibenzothiophene (35.38 %) in gasoline–diesel fraction have been removed after oxidative–extractive reaction.…”

Section: Resultsmentioning

confidence: 99%

Desulfurization of Saudi Arabian crudes by oxidation–extraction method

et al. 2015

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The oxidation–extraction desulfurization of Saudi Arabian crudes was conducted with hydrogen peroxide–acetic acid oxidation system. The selection of extractant, the optimization of oxidation–extraction conditions, and the exploration of desulfurization mechanism were studied. As DMF was used as the extractant, the optimal desulfurization rate of 35.11 % and oil recovery of 95 % were obtained at 70 °C with the molar ratio of peracetic acid to sulfur of 8:1, the molar ratio of acetic acid to hydrogen peroxide of 2:1 and the volume ratio of extractant to oil of 1:1. The desulfurization effect of different fractions in the treated Saudi Arabian crudes was found to obey the following order: gasoline–diesel fraction >VGO fraction >VR fraction, due to different types and structures of sulfur compounds. The oil quality was less affected and most sulfides were mainly extracted via DMF.

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“…Gore et al (2003) developed a patent in which peracetic acid was used as an oxidant for CODS of light atmospheric gas oil (LAGO) and at the same time using 2 parts H 2 O to 98 parts AcOH as an extraction solvent SR of 82% was achieved at 15°C. In another work presented by Shiraishi and Hirai (2004), the viscosity of VGO was reduced by diluting it with n-decane and subsequently oxidizing with peroxyacetic acid at 70°C. The generated sulfones were then extracted using ACN (84%).…”

Section: Organic and Inorganic Acidsmentioning

confidence: 99%

Deep oxidative desulfurization of liquid fuels

Mjalli

Ahmed

Al-Wahaibi

et al. 2014

Reviews in Chemical Engineering

164

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Increase in energy demand and consumption has been accompanied by a corresponding increase in sulfur emissions. These pollutants have both health and economic consequences. Furthermore, it significantly reduces the efficiency of advanced emission control systems of diesel engines, thereby indirectly causing more harm to the environment. This resulted in stringent sulfur emission limit down to about 15 ppm or less and in turn served as an incentive for research into alternative sulfur reduction technologies. Although feasible improvements to hydrodesulfurization are currently under investigation, adsorptive, extractive, oxidative and biodesulfurization have also been studied in recent years. Oxidative desulfurization appears to be one of the most promising desulfurization technologies due to its broadness and compatibility with other technologies such as extractive, adsorptive and biodesulfurization. The advent of ionic liquids as extraction solvents has made this even more so. This work, therefore, reviews the different approaches and investigations carried out on oxidative desulfurization while identifying research gaps and giving important recommendations.

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Desulfurization of Vacuum Gas Oil Based on Chemical Oxidation Followed by Liquid−Liquid Extraction

Cited by 65 publications

References 11 publications

The oxidation of dibenzothiophene using oxidovanadium(IV)-containing nanofibres as catalyst

The oxidation of dibenzothiophene using oxidovanadium(IV)-containing nanofibres as catalyst

Desulfurization of Saudi Arabian crudes by oxidation–extraction method

Deep oxidative desulfurization of liquid fuels

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