SU957933A1 - Oil demineralization method - Google Patents

Description

The invention relates to methods for desalting the diesel oil and can be used both in industry for mixing oil with desalting agents, preparing fuels, etc., as well as in other areas, for example, for preparing coolants (emulsions), mixing liquids with gases, etc.

There is a known method of desalting, including mixing dehydrated oil with washing water in the presence of a demulsifier, the oil being mixed with water in two steps: first, 2050% of the raw material is mixed, then the rest is mixed

This method is ineffective, since the process of mixing oil with water takes a lot of time, as the mixing of components takes place when transporting them by pipeline and the mixing process is not intensive.

The closest to the invention to the technical essence and the achievable result is the method of oil desalination, which includes mixing oil with water and a demulsifier and the subsequent separation of oil 2, The main disadvantages of the method include the following. The components are mixed insufficiently and rapidly - on average, it takes 30-40 minutes. When oil is mixed with water by the turbines, these materials are driven by parallel flows of a vortex nature created by the turbines. Therefore, the contact area of materials is limited to surfaces parallel to the moving flows of oil and water,

 in addition, the crushed components using turbines occurs to particles of sizes 1-3 mm and more, which also limits the contact area, adversely affects the uniformity

20 of the resulting mixture, and, ultimately, on the quality of desalting. In addition, it is necessary to point out the complex instrumentation of the method: the need to use a large capacity, turbines for mixing and at the same time the mixing process is not continuous.

The purpose of the invention is to intensify the process and improve the quality

desalting, as well as simplifying the instrumentation of the method.

To this end, in the method of desalting oil, which includes mixing oil with water and a demulsifier and the subsequent separation of oil, mixing is carried out by acting on the components with low-frequency vibrations in the mode of vibro-cavitation with a frequency of 10-130 Hz with amplitude acceleration of 20-40 d and simultaneously mixing gas is supplied, for example air.

It is advisable to apply gas in the amount of 3-20% of the volume supplied to the mixing components.

The method is carried out as follows.

Components are fed into the container in predetermined quantities of 1X, and a vibrator is simultaneously turned on. Oscillations are set on the vibrator, the parameters of which choose from the limits the frequency F 10–130 Hz, amplitude (amplitude acceleration) and 20–40 g {amplitude acceleration is the acceleration of oscillations aP, where a is the amplitude; F frequency f for convenience, the acceleration of oscillations is expressed as the acceleration of free fall). These parameters were chosen experimentally, and it was found that at frequencies below 10 Hz and above 130 Hz and with an amplitude acceleration of less than 20 g, the mixing effect of the oscillations decreases sharply, almost no mixing occurs. The upper limit of amplitude (amplitude acceleration) is chosen for practical reasons. At amplitudes greater than 40 g, the mixing process goes on intensively, mixing is obtained qualitatively; however, in practice, the use of amplitude accelerations over 40 g results in an unjustified complication of the instrumentation of the method, the loss of equipment, devices, unnecessarily increase energy costs.

The supply of air (or another gas, e.g., Oj) to the tank is a prerequisite for the process. The gas, which is very quickly mixed with the liquid, causes the possibility of the development of intensive macro-motions of a vortex nature when exposed to the components to be mixed with oscillations with the characteristics indicated above. In the absence of gas, the mixing process is shackled, vortex macro-flows do not develop in the liquid, the components cannot be mixed in this case. The minimum amount of gas that must be supplied to the tank in order for the mixing process to start noticeably is 3% of the total volume of the feed components. This value is determined empirically. By increasing the gas supply, the mixing process is intensified. The most acceptable amount of gas is 10-20%. In this case, the mixing goes quickly (3-7 seconds are enough for the components to remain in the tank), the mixing is thin and even. Feeding more than 20% of the gas into the tank has a negative effect on performance. Therefore, for practical reasons, it is desirable to limit the amount of supplied gas to 20% ..

The components fed into the tank under the action of vibrations are quickly mixed, and the mixture is ready to be drained from the mixing tank to the dehydration stage.

The proposed method significantly speeds up the process of oil desalting due to the rapid mixing of oil with water and an emulsifier. If it was previously required 2060 minutes for good fine mixing of these components, then using the described technology, you can subtly and evenly mix them for 3-10 seconds, i.e. 200-400 times faster. In this case, the instrumentation is much simpler known for mixing oil with water. The speed of the blending process allows the desalting of the oil to be continuous in the stream. The quality of desalting is higher than in the prototype and other analogues, since the fragmentation of materials under the action of vibrations occurs to particles of a size of 0.011 mm, water and the demulsifier are evenly distributed throughout the entire volume of oil and rapid and complete desalting of oil occurs. In addition, using the invention, coolant can be made (lubricating fluids, for example, in the form of water-oil emulsions. For example, in one of the experiments, water-oil emulsions were prepared. When 10 mg second was measured and water was used. After ten seconds processing a thin emulsion was obtained, which was not stratified for 7 days.

Claims (2)

1. A method of desalting oil, comprising mixing the oil with water and a demulsifier and subsequent oil separation, characterized in that, with a view. intensifying the process and improving the quality of desalting, as well as simplifying the instrumentation of the method, mixing is performed by affecting the components with low-frequency oscillations in vibrocavitation mode with a frequency of 10-130 Hz, 1FIl amplitude acceleration of 20-40 g, and simultaneously mixing gas is applied, for example air. 2. The method according to claim 1, of which the gas is supplied in the amount of 3-20% of the volume supplied for cftemHfiaHH.e components. Sources of information taken into account during the examination 1. USSR author's certificate O 504832, cl. C 01 G 33/06, 1973. 2. USSR author's certificate number 347341, cl. C 01 G 33/06, 1967 (prototype /.