Tag Archives: Diesel Fuel

Desulfurization of diesel fuel

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Desulfurization of diesel fuel. Thus, the consumer receives fuel with strictly limited sulfur content. Obviously, the less sulfur, the more expensive the product. A way to save on the fuel bill is to take lower grade diesel fuel and process it to satisfy the requirements of the vehicle fleet.

GlobeCore offers the desulfurization process based on the AVS-150 magnetic nano-mill and the UVR unit.

The process equipment for continuous desulfurization is a 1 cubic meter tank, a pump to supply the fuel to the AVS-150, a vessel with a dosage pump to supply reagent, a portioning device to supply ferromagnetic particles into the chamber of the AVS-150 and a UVR vacuum fuel regeneration unit.

The 1 cubic meter tank is filled with the fuel to process. The pump supplies it to the chamber of the AVS-150 along with the reagent from the 30 liter tank. After treatment in the unit, which only takes a fraction of a second, the fuel flows to the UVR unit, where is passes through a layer of adsorbent to remove the products of the reaction between the reagent and sulfur. The treatment and mixing of the reagent with the diesel fuel is performed by steel ferromagnetic particles. Particle wear is 5 grams per 1 hour of operation, that is, 0.01 gram per 1 liter of processed fuel. Particles are loaded automatically by a portioning device. The rate of processing is 0.5 m3/hour.

The efficiency of chemical processing depends on the intensity of mixing and completeness of reaction product removal. Intensive mixing of reagents, even at high temperature and low concentration of of solution, forms emulsions which require more time to separate. To intensify this process, the AVS is used to facilitate intensive mixing of the fuel with the reagent.

As a result of our tests, we reduced the amount of sulfur in diesel fuel from 337 to 8 mg/kg, while retaining other important quality parameters, such as flashpoint, fraction content etc.

GlobeCore Diesel Fuel Desulfurization Unit

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Diesel Fuel Desulfurization. Sulfur is a common component in crude oil, where it can be present both in elementary form and in the form hydrogen sulfide and organic substances, such as disulfides, mercaptan etc. Generally, the influence of sulfur and its compounds on oil products is negative, due to its corrosive properties. That is why it is recommended to eliminate sulfur and hydrogen sulfide and limit the content of mercaptan. The content of other sulfur compounds is regulated by such parameter as “sulfur content by weight”.

The strict the requirements on sulfur content in fuel, the deeper the purification and the cost of the process. This is the reason that this chemical element is present in practically all fuels in the market.

Nevertheless, the weight part of sulfur in oil products is limited by regulations for environmental reasons. Sulfur compounds increase toxicity of exhaust gases and are under close scrutiny of environmental protection agencies.

Desulfurization begins at the stage of crude oil refining. This is achieved in the processes of catalytic hydrotreatment, biodesulfurization, oxidation of sulfur compounds by hydroperoxides etc. The content of sulfur in finished product is also one of the criteria of grading it. Euro-2 diesel fuel contains no more than 500 mg/kg of sulfur compounds, Euro-3 – 350 mg/kg, Euro-4 – 50 mg/kg and Euro-5 -10 mg/kg.

How to Remove Water and Mechanical Impurities from Diesel Fuel?

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The Contamination Process of oil products traces its roots to oil refineries and accelerates at each subsequent stage of the petroleum’s life cycle.  The concentration of pollutants in an automobile fuel tank can reach up to between 0.04 to 0.06 g/kg (for gasoline) and 0.15 to 0.6 g/kg (for diesel fuel).  It is also nearly impossible to prevent water from getting into petroleum products.

Watering occurs due to the tanks “breathing” during the period of storage as well as from condensation of moisture from the air.  Water therefore, can remain in fuel in both a dissolved or an emulsified form.

Emulsified water has the most dangerous influence on the performance characteristics of petroleum products.  The formation of water-fuel emulsions, which can occur for any reason at an oil refinery, will inevitably lead to significant financial losses.

Water contaminated petroleum products can cause:

  • corrosion of equipment;
  • product loss during the process of tank drainage;
  • excessive preparation time of raw material, intermediates and finished products;
  • freeze damage of equipment in winter time; and
  • decreasing of the catalytic process efficiency and reduction of catalyst service life.

Today various processes and machines are used in industry, and their operational principles are based on both traditional (influence of gravitational and electric fields, chemical treatment, filtration through special baffles) and modern approaches (ultrasound and magnetic fields effect).  As a general matter, the necessary quality of petroleum products is achieved through usage of the full range of measures aimed to remove all or the majority of impurities.

Cleaning mechanical admixtures with the help of various filters is one of the most common methods of controlling contamination in oil products.  Centrifugal separators can be used to remove water and mechanical particles.  Corrective Maintenance however, can be a quite problematic and time-consuming process. Additionally, corrective maintenance can be very expensive.

The efficiency of coalescence filters, subject to the presence of large amounts of mechanical impurities in feedstock, leaves much to be desired.

The problem of purifying light petroleum products can be solved most effectively using GlobeCore UVR-type plants.  GlobeCore equipment is suitable for diesel fuels, transformer oils, hydraulic oils and industrial oils and can clean and remove free and dissolved water and mechanical impurities as well as water-soluble acids and alkalis.

Porous polymer compositions are used as the filtering materials for UVR plants.  They were tested for the first time back in the 1970’s, and even at that time they were proven to be reliable water and mechanical impurity retainers.  Effective purification is achieved due to the filtering material’s volume as well as the filtering material’s tortuosity.

One of the main advantages of the UVR plants is the filters’ recoverability.  UVR filters can be used multiple times before replacement is required.

The machines are divided into two groups according to the type of the filter element installed and used by the machine:

  • equipment that provides purification by removing mechanical impurities only;
  • equipment that provides purification by removing free and dissolved water as well as mechanical impurities.

When using the GlobeCore UVR plants, you can provide diesel fuel of high quality as well as the reliability and efficiency of the equipment in which this fuel is used.