Basic technical parameters of gasoline
It is not the same for your car what you fill its tank with. It will depend on your choice of petrol whether your car will choke or jerk as a high spirited horse or whether it will fly.
Fractional composition. Gasoline is a mixture of hydrocarbons. Every hydrocarbon in gasoline has its distinct boiling temperature. The interval between the boiling temperatures in the mixture is called fractional composition.
Whether you are able to start a cold engine depends upon the initial boiling temperature of the gasoline and upon the temperature of the boiling out of 10 % of the gasoline volume. The lower is the temperature, the easier it will be to start the engine, especially in winter. But if the temperature is too low, there can be gas jams in the fuel feeding into the combustion system.
The temperature of the boiling out of 50%of the volume. The lower is the temperature the less time it takes for the engine to heat, which means that less fuel is used. It also means that it is easier for the engine to switch from one mode to another, which is very important while driving in town.
The final boiling temperature of the gasoline. If this temperature is too high, the evaporation of the fuel worsens, it spreads unevenly in the cylinders. Microdrops of gasoline can penetrate into them. This is how the lubricant is washed away and the engine wears out faster. Furthermore, the loss due to the unburnt fuel increases. Such temperature is strictly limited by the standards. The world standards anticipate the final gasoline boiling temperature of 215-220°C and for the gasoline produced in AB Mazeikiu Nafta it reaches 210-215°C.The stability of this indicator can be guaranteed only by oil refineries which have suitable conditions for blending the components. The blending of different components in “domestic” conditions does not allow to maintain this indicator.
Octane number. It states the feature of gasoline to burn in the internal-combustion engine without detonation. Detonation is a spontaneous-untimely ignition of the gasoline vapour and air mixture caused not by a plug, but by the pressure as well as by the heated particles of the cylinder. The octane number shows the resistance of the above mentioned blend to the spontaneous detonation. The octane number is determined in two ways: by the engine (characterises driving in the urban environment) and by research (on the highway).
The higher is the indicator, the greater is the level of pressure and the power of the engine. The gasolines are graded according to their octane number. For example, grade 95 indicates that the resistance of the gasoline to detonation is not less than 95. It is for more than 5 years already that ethyl (tetraethyl lead) has not been used for increasing the octane number of gasoline. Methyltretbutylether (MTBE) has been used for high grade gasolines instead. Its octane number is about 118 and its quantity in gasoline does not exceed 7-10 percent. It is to be noted that such gasoline should not be stored in leaky vessels for a long time as the larger part of MTBE will evaporate. At present all the gasolines produced at AB Mazeikiu Nafta are clear and fully meet the European standards.
Recently new gasoline grades appeared in the gas stations. If the gasoline is blended with ethanol, its grade is marked as follows: 95ES, which means that it contains 5% of ethanol. Such fuel is not produced at AB Mazeikiu Nafta. It is blended with the gasoline produced in our company at the fuel depots and is later sold as a separate product.
Corrosive activity of gasoline. It is characterised by the velocity of the chemical reaction between gasoline, its combustion products and materials from which all the systems are made and in which the products circulate: fuel feeding, exhaust systems, combustion chamber. Corrosive activity depends upon the acidity, overall quantity of sulphur, mercaptane sulphur, water deliquescent acids and alkali. The quantity of sulphur in the gasoline produced by AB Mazeikiu Nafta ranges from 0 to 0.015 percent. This is fully in line with the current European standards. When the quantity of sulphur is bigger, after the gasoline combustion corrosion causing SO2 and SO3 emerge.
Gasoline meeting the European quality standards
As the requirements become stricter, the question of quality of oil products becomes more important for consumers. AB Mazeikiu Nafta started to supply the Lithuanian market with gasolines in limited quantities since 2001, and since the autumn of 2003 UAB Mazeikiu Nafta Trading House has fully switched to trading only in high class gasolines meeting the requirements of the EU.
The new fuel fully meets the requirements of the present day European Union market. Since the year 2000 the European Union standards regulate the quantity of benzene as well as the minimum allowed quantity of sulphur in all the grades of motor gasoline. Although these requirements came into force in Lithuania only in 2004, AB Mazeikiu Nafta and UAB Mazeikiu Nafta Trading House have been supplying on demand all wholesalers and consumers with the gasoline meeting the EU requirements since January 2003.
The quantity of benzene in the more environmetally friendly gasoline meeting the EU standards is several times lower than in the gasoline meeting the old requirements of quality: the latter contained 5% benzene of its volume and the gasoline meeting the EU standards has less than 1% benzene of its volume. Moreover, the quantity of the sulphur in the gasoline which UAB Mazeiku Nafta trades in has decreased as much as 3 times, which is up to 10-50 milligrams per kilogram. (In Lithuania it is allowed to trade in gasoline with the quantity of sulphur not exceeding 50 milligrams per kilogram).
Gasoline with multifunctional additives VENTUS
It has been established by experiments that even a very high quality gasoline leaves scale after thecombustion. Multifunctional additives are used to remove the scale;they are added to the gasoline just before the deliveryto theconsumer. As a result, the scale does not stick to the walls, and so the cylinders, the combustion chamber, the valves andthe fuel jets are cleaned out– in this way all the fuel system starting with a gasoline tank is washed. Multifunctional additives stimulate a better fuel combustion in the cylinders due to which the fuel consumption falls by 2.5 percent. They cover the engine fuel system with anticorrosive layer, remove water from the system and prevent the filters from blockage, which is especially important in winter.
The gasoline with multifunctional additives produced by AB Mazeikiu Nafta has a trademark VENTUS. When using such gasoline the capacity of the engine improves considerably due to the effect of the multifunctional additives and the quantity of the harmful exhaust gas emitted into the atmosphere decreases.