scholarly journals OXIDATIVE DESULFURIZATION OF PETROLEUM PRODUCTS

2021 ◽  
Vol 297 (3) ◽  
pp. 199-203
Author(s):  
VIRA RUDENKO ◽  
VITALY CHUMAK ◽  
VALERIY YEFIMENKO ◽  
OLENA KOSENKO ◽  
ОLENA SPAS’KA ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Activated Carbon ◽  
Sulfur Content ◽  
Oxidative Desulfurization ◽  
Petroleum Products ◽  
Advantages And Disadvantages ◽  
Petroleum Fractions ◽  
Sulfur Containing ◽  
Sulfur Containing Compounds

The modern world market makes stringent requirements for the quality of motor fuels, in particular for sulfur content in them. The main classes of sulfur-containing compounds in petroleum fractions are thiols, dialkyl and cycloalkyl sulfides, alkylaryl sulfides, as well as heteroaromatic compounds – benzothiophene, dibenzothiophene and their alkyl derivatives. They have a negative impact on the quality of petroleum products. Growing demands on the quality of oil and petroleum products have led to the search for ways to reduce the sulfur content in oils and which would not lead to deterioration of physicochemical parameters of oil, such as viscosity, density, acidity, elemental and fractional composition, etc. Among the existing methods of desulfurization of oils and their fractions, special attention is drawn to oxidation methods that allow organic sulfur compounds to be converted into sulfoxides and sulfones which are easily removed by conventional separation methods, in particular by extraction or adsorption. The prospects of the oxidation method are due to the possibility of practical use of sulfoxides and sulfones in various sectors of the economy. The most common oxidants in the processes of oxidative desulfurization of petroleum fractions are hydrogen peroxide and alkylhydroperoxides in combination with catalysts that provide high selectivity and speed of the process. Transition metal compounds (Mo, V, W,) are most often used as catalysts because they are able to form peroxocomplexes in the presence of peroxides. Heterogeneous catalytic systems consisting of various solid carriers (salts, oxides, activated carbon, zeolites) and peroxide oxidants (hydrogen peroxide or alkyl hydroperoxides) are actively developing. Molybdenum-containing catalysts are one of the most efficient heterogeneous systems for oxidative desulfurization of diesel fuel. There is proved the effectiveness of oxidative desulfurization, which is a combination of catalytic oxidation of sulfur-containing compounds in the presence of a heterogeneous catalyst and adsorption on activated carbon. Methods of oxidative desulfurization with their advantages and disadvantages can be logical addition to large-tonnage hydrotreating processes, and also potentially can be used as an independent method of deep purification of oil and petroleum products from sulfur-containing compounds.

Phosphotungstic Acid/Semi-Coke Catalysts for Oxidative Desulfurization of Diesel Fuel

2009 ◽  
Vol 79-82 ◽  
pp. 1683-1686 ◽  
Author(s):  
Liang Wang ◽  
Chun Hu Li ◽  
Ying Fei Hou
Keyword(s):  
Hydrogen Peroxide ◽  
Phosphotungstic Acid ◽  
Oxidative Desulfurization ◽  
Diesel Oil ◽  
Oxidizing Agent ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sulfur Containing ◽  
Sulfur Containing Compounds ◽  
Scanning Electron

This work presents the results obtained in the development of phosphotungstic acid/semi-coke catalysts in the oxidative desulfurization (ODS) process of diesel oil using hydrogen peroxide as the oxidizing agent. Phosphotungstic acid /semi-coke (60wt%) prepared by impregnation. These catalysts were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM), The effect of the amount of catalyst used , on the efficiency of desulfurization was investigated. In addtion. the diesel after oxidation and extraction was analyzed by GC-FPD for sulfur content. The chromatograph shows that virtually all the sulfur containing compounds in diesel were removed.

scholarly journals Nanocatalysts for Oxidative Desulfurization of Liquid Fuel: Modern Solutions and the Perspectives of Application in Hybrid Chemical-Biocatalytic Processes

Catalysts ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1131
Author(s):  
Olga Maslova ◽  
Olga Senko ◽  
Argam Akopyan ◽  
Sergey Lysenko ◽  
Alexander Anisimov ◽  
...  
Keyword(s):  
Liquid Fuel ◽  
Oxidative Desulfurization ◽  
Liquid Fuels ◽  
Bacterial Cells ◽  
Advantages And Disadvantages ◽  
4S Pathway ◽  
Oil Fractions ◽  
Hybrid Technologies ◽  
Sulfur Containing ◽  
Sulfur Containing Compounds

In this paper, the current advantages and disadvantages of using metal-containing nanocatalysts (NCs) for deep chemical oxidative desulfurization (ODS) of liquid fuels are reviewed. A similar analysis is performed for the oxidative biodesulfurization of oil along the 4S-pathway, catalyzed by various aerobic bacterial cells of microorganisms. The preferences of using NCs for the oxidation of organic sulfur-containing compounds in various oil fractions seem obvious. The text discusses the development of new chemical and biocatalytic approaches to ODS, including the use of both heterogeneous NCs and anaerobic microbial biocatalysts that catalyze the reduction of chemically oxidized sulfur-containing compounds in the framework of methanogenesis. The addition of anaerobic biocatalytic stages to the ODS of liquid fuel based on NCs leads to the emergence of hybrid technologies that improve both the environmental characteristics and the economic efficiency of the overall process. The bioconversion of sulfur-containing extracts from fuels with accompanying hydrocarbon residues into biogas containing valuable components for the implementation of C-1 green chemistry processes, such as CH4, CO2, or H2, looks attractive for the implementation of such a hybrid process.

scholarly journals Titanium-Modified MIL-101(Cr) Derived Titanium-Chromium-Oxide as Highly Efficient Oxidative Desulfurization Catalyst

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1091
Author(s):  
Xiaolin Li ◽  
Liang Zhang ◽  
Yinyong Sun
Keyword(s):  
Reaction Time ◽  
Surface Area ◽  
Chromium Oxide ◽  
Oxide Catalyst ◽  
Specific Activity ◽  
Oxidative Desulfurization ◽  
Titanium Content ◽  
Titania Content ◽  
Sulfur Containing ◽  
Sulfur Containing Compounds

A titanium-chromium-oxide catalyst was prepared by a facile calcination of titanium-modified MIL-101(Cr). The resulting material, possessing a surface area of 60 m2 g−1 and a titania content of 50.0 wt%, can be directly used as the catalyst for oxidative desulfurization (ODS) reaction of dibenzothiophene (DBT). This novel ODS catalyst can remove 900 ppm sulfur-containing compounds in a reaction time of 30 min at 60 °C. The experimental results showed that the specific activity increased with the titanium content. The specific activity of the catalyst with 50%Ti reached 129 μmol/m2, which was much higher than that of reported Ti-based catalysts.

scholarly journals Impact of bitumen composition on empirical properties

2018 ◽  
Vol 196 ◽  
pp. 04038
Author(s):  
Eva Remišová ◽  
Michal Holý
Keyword(s):  
Crude Oil ◽  
Sulfur Content ◽  
Vacuum Distillation ◽  
Petroleum Products ◽  
The Other ◽  
Distillation Residue ◽  
Heavy Fractions ◽  
Further Development ◽  
Vacuum Distillation Residue

In recent years, there has been a further development of refining technology, which make it possible to better use of crude oil, which also has a major impact on the quality of bitumen. Most European refineries, of course, are processing, for reasons of the resale of petroleum products, especially petroleums suitable for the recovery of light and middle fractions. Therefore, light petroleums are required, with low yields of heavy fractions, which are highly economically and in dispositions efficient for processors on the petroleum market. Emphasis is placed on the sulfur content, the paraffin content is no longer the most important aspect. Less important from the perspective of the refinery is the content and the ratio of asphaltenes and maltenes. There is no doubt that we will have to change our view on petroleum products. Their availability will continue to decline, their price, on the other hand, is likely to grow in relation to falling supplies of resources. Therefore, the view of the bitumen must be changed. The most common way of production of PG bitumen is vacuum distillation, which is carried out in such a way that the vacuum distillation residue satisfies it´s properties bitumen requirements for the relevant penetration.

scholarly journals ALKALINE WOOD PULPING WITH QUINONE PRESENCE AND ITS INFLUENCE ON QUALITY OF DESIRED PRODUCT USED FOR PACKING PRODUCTION

2017 ◽  
Vol 16 (5) ◽  
pp. 432-436
Author(s):  
I. I. Karpunin
Keyword(s):  
Lignin Content ◽  
Positive Influence ◽  
Raw Material ◽  
Output Increase ◽  
Cost Efficient ◽  
Alkaline Delignification ◽  
Sulfur Containing ◽  
Qualitative Characteristics ◽  
Sulfur Containing Compounds

Application of waste liquor at a rate of 25% that contains the used quinone and is applied as an additive has shown that qualitative characteristics of the obtained desired product do not differ from a product while using fresh quinone for pulping of cellulose-containing vegetable raw material. For this reason process of obtaining the desired product (cellulose or semicellulose) becomes economically cost-efficient on the basis of calculation and with due account of ecology. While analyzing investigation results pertaining to production of wood pulp from vegetable raw material (sprucewood) it is possible to point out the fact that qualitative characteristics of the desired product have been improved due to addition of quinone in the process of alkaline wood pulping (sulphate and sodic). A number of research publications have described a positive influence of additives on alkaline delignification of vegetable raw material. It subsequently improves the quality of the desired product: reduction of lignin content in the product; an output increase in cellulose and hemicellulose, α-cellulose in cellulose; upgrading of physical and mechanical indices. All the above-mentioned elements and components contribute to better quality of the manufactured packing products. In this case formation of hazardous sulfur-containing compounds is fully excluded.

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