The method of dehydration of the oil

 

(57) Abstract:

The invention will otnositsa to the oil industry and can be used to clear the water motor and other oils. For dewatering of flooded engine oils heated to 65-70oWith the oil centrifuged at disc separator and then assembled in an open tank, the oil is again heated to a temperature 100-108oC to achieve a desired water content in the oil. The proposed method is much simpler and more effective known. 1 Il.

The invention relates to the refining industry and can be used in the dewatering of flooded engine oils containing additives, as well as other oils.

There is a method of dehydration of oils by water precipitation during heating oil up to 80o(Rules of technical operation of the tank farms. - M.: Nedra, 1986; ed. St. USSR N 1260387, CL 10 G 33/06, 1988). As a result of sedimentation, the water settles and is then drained from the tank through the lower discharge pipe.

The disadvantages of this method are as follows.

Dissolved water in the oil contained in the oil in a monomolecular state, cannot be deleted.

Emulsion water in oil, the train in the mechanical crushing suck water pumps, having a particle size of several microns or less, also almost is not removed. To mineral and synthetic oils to improve or maintain for a long period of their operational properties add additives - viscous, depressant, corrosion and oxidation inhibitors, detergents, anti-wear and others. The total amount of additives contained in the oil, depending on its brand reaches 5-7% and more.

For example, in the oil M-8B according to is the following additive composition: 4% VNII NP-360, 2% of PMS, 0,9% DF-11, 1-1,5% AFK and 0.003% PMS-200A ('products, their properties and application. The Handbook. Edited by N. He Puchkova. - M.: Chemistry, 1971). The total content of additives from 7.9 to 8.4%. Some of the additives are soluble in water, others are typical surfactants to the system maslovoza. In the presence of water in oil, the formation of colloidal systems, hydration additives, the formation of micelles consisting of water, additives and oils.

Linked so the water gets properties other than free water, and remove its way to defend the impossible. At the same time, the amount of bound water in the oil may be superior compared to eMule and storage (Japan Patent N 1-S, CL 10 G 177/00; 105/40, 107/34, 1989). For this purpose, the oil is brought into contact with the zeolite having a particle diameter of 0.1-10 μm, such as molecular sieve 3A or 4A. The lubricating oil is brought into contact with the zeolite, in microporous bag, and kept in a vessel at 15-40oC for 5 h to 1 month. The disadvantages of this method are as follows: required disposal watered zeolite, the inability to remove the water in the oil in the bound form, i.e. in the form of crystalline.

The method of dehydration of recoverable oil and a device with a blowdown drum for water evaporation is the evaporation of water from the oil at a temperature above the dew point temperature of the water in the drum (U.S. Patent N 5223-152, CL 10 G 33/00, 1993). Thus it is possible to evaporate pure water emulsion and water dissolved in oil, but it is impossible to remove bound water of crystallization.

The method of dehydration of the bitumen is heated bitumen to a temperature not lower than the boiling temperature of the contained water (ed. St. USSR N 1273376, CL 10 G 33/00, 1985). The method of thermal dehydration of bitumen consists in evaporation of moisture from the mixture watered and dewatered bitumen in the presence of additives surfactants (ed. with oil without substantial degradation of the engine oil during prolonged heating it to a temperature of 150oC.

Method of destruction of the emulsion type water in oil refers to the dehydration and desalting of the emulsion type water in oil) in strong electric fields (ed. St. USSR N 1353802, CL 10 GG 33/02, 01 D 17/06, 1986). This method is used to remove water from oils, additives which are missing or in a small amount.

Other ways to remove water from oil and oil products involve the use of volatile hydrocarbons (U.S. patent N 4762609, CL 10 G 33/00, 1988), the hydrocarbon diluent (ed. St. USSR N 1609824, CL 10 G 33/04, 1988) and demulsifier (ed. St. USSR 1397473, CL 10 G 33/04, 1986, N 1361169, CL 10 G 33/00, 1986, N 1288617, CL 10 G 33/004, 1984, N 1273384, CL 10 G 34/04, 1984), alkalizing means and hydrocarbon diluent (U.S. patent N 4466885, class C 10 G 33/04, 1984, other chemical compounds (U.S. patent N 4477337, CL 10 G 33/04, 1984). Disadvantages of these methods as applied to motor oils lies in the fact that the oils are introduced chemical compounds that can alter the characteristics of the oils.

A known method of purification of processed oils from water and light fractions by author. St. USSR N 1616980, CL 10 M 175/02, 1988 prototype. Original oil pre-dispersed with water and contact in cyclone camshow average droplet size of the oil to about 600 microns. The temperature of the oil 20oWith the water content in experiments 2%, flashpoint 100oC. Modifying the fuel consumption down to 26.6 23.3 kg per ton of oil, the consumption of additional water from 240 to 120 l/h, when the supply of oil in the amount of 600 l/h, the following relevant characteristics of the refined oil: temperature of the refined oil was changed from 117 to 175oWith the temperature of the gas mixture was changed from 190-220 to 350oWith water in the oil was absent, the flash point was changed from 140 to 196oC. Disadvantages of this method are as follows. Original oil pre-dispersed in water, and therefore part of the additive is dissolved in the water. In the cyclone chamber dissolved additives can go together with gas-vapor mixture. When the temperature of the flash 196oWith, indicating almost complete removal of the oil light fractions and water, the temperature of the gas mixture is equal to 350oC. At this temperature, the chemical composition of the oil may change as a result of its oxidation.

The aim of the invention is to develop a method of removing water from flooded oils containing additives, and first removing water from flooded engine oils.

is his centrifuged for separation maslootdelitelnogo installing PSM 2-4 (mobile macroeconomically PSM 2-4. Passport 08.00.00.00=04 PSM. - M.: Westergeest, 1991), working in the mode of purification. The rotational speed of the drum of the separator 110-1(6600 rpm), the diameter of the drum 346 mm, the number of separation plates 78. When the centrifugation in the large shear stress changes the state of a colloidal system - micelles dissolved hydrated water is allocated in its pure form. The oil passing centrifugation on a plate separator is heated to the evaporation temperature of water. While heating oil at a constant speed, the oil temperature at the beginning of the linearly increasing to a temperature of about 100oWith, then when the temperature reaches 105-108oSince it remains constant despite further heating oil. In this case, the heat supplied to the oil consumed in the evaporation of water. Heating is carried out up until the water content will not meet the requirements on oil. Is the method in the following way. In the tank with heaters, such as prepodavatel, the oil is heated to 65-70oWith, and bottom drain connection connect the pipe or hose to the inlet side of the separator. The oil is treated at a temperature of 65-70oWith on disc separator and sent to the free Renaut, thus the top hatch of the tank is opened to remove water vapor. Water is evaporated by heating oil. During the evaporation of the water, the oil analyzed for water content and other indicators. Upon reaching the desired results on the water content of the heat off.

In this way was dehydrated 1000 kg engine oil MV. The initial water content in oil, as determined by the method of Dean-stark was 0.25 per cent. The oil was opaque, light brown color.

After heating to 70oWith oil was processed in the separator-oil cleaner PSM-4 mode of purification at atmospheric pressure. During centrifugation of the oil was allocated to 5 l of water, what is 0.5% of the original water-cut oil. The water content in oil, as determined by the method of Dean-stark was 0.3%. These results on the water indicate that by centrifugation separator bound water becomes free water, in the form of fine droplets. Part of the released water removes the separator. The original oil had a light brown color, but opaque. After processing on the separator color changes to yellow, the oil also remained opaque.

After that theoC. the oil Temperature rose to 105oWith temperature variation was within 103-108oC. the Oil was heated up until the water content in the oil was below 0.03% of traces of water. The apparent evaporation of water began in the 90oC.

After processing the oil by heating to 105oWith oil in appearance has changed - it became transparent and acquired color characteristic of oil MV.

The original water-in-oil MV and the same oil treated in the separator-oil cleaner without subsequent heating to 105oWith, were subjected to additional testing.

The drawing shows the dependence of the temperature of the source water-cut oil MV from time to time at a constant heating rate, and the same oil after centrifugation separator PSM-4 mode of purification. The experiments were conducted as follows. 400 g butter, pour in one litre chemical beaker was heated on the stove-top, without changing the power of the heaters. At the same time was measured oil temperature to determine the dependence of temperature on time. From the drawing it is seen that when the heat source watered oil on the curve, there are two grounds - first at a temperature of 168-166oWith, when the second temperature is division-free water. When water evaporates heat is spent on its evaporation, and the oil temperature is not growing. After centrifugation of the oil plate separator dependence is different. Oil temperature above 108oLong time never rises - is the evaporation of water. Water is formed during the destruction of micelles and crystalline with a strong shear stresses arising in the oil during processing in the disc centrifuge separator - oil cleaner PSM 2-4.

The proposed method can be applied in various industrial sectors of the economy, for example, in petroleum refining, petroleum, petrochemical and other industries.

The method of dehydration of the oil when heated, wherein a temperature of 65-70oWith water-in-oil centrifuged at disc separator and then assembled in an open tank the oil is heated to a temperature 100-108oWith in a period of time to achieve a desired water content in the oil.

 

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