SU711099A1 - Method of destroying aqueous oil emulsion - Google Patents

Description

I

The invention relates to methods for destroying water-in-oil emulsions in an electric field and can be used in chemical technology for dewatering oil-water emulsions in the oil industry: the process industry.

A known method for separating a water-in-oil emulsion using sparging gas f1.

However, the process of subsequent sedimentation is not fast enough, it limits processing and requires the use of containers of a relatively large volume.

The closest to the described invention according to the technological essence is a solution in which the destruction of a water-oil emulsion is carried out in a constant electric field of low intensity 2).

The disadvantage of the method is the relatively long duration of the process of subsequent sedimentation.

The aim of the invention is to accelerate the process of subsequent sedimentation.

To achieve this goal, the destruction of the water-oil emulsion is carried out in a constant electric field of high intensity while simultaneously passing air through the emulsion. Electric field strength 0.3-10 kV / cm.

The essence of the method is as follows.

With a constant electric field, water droplets are polarized, enlarged, lined up in conductive chains, contributing to the occurrence of breakdowns and leading to the need to reduce the intensity of the field and the efficiency of the process as a whole.

The bubbling of gas prevents the formation of chains and leads to a localized condensation of the force lines between the bubbles, which contributes to an increase in the destruction efficiency.

Example. Oil-water emulsion prepared from transformer oil and 10% solution of technical sodium chloride in distilled water with a water concentration in the emulsion up to 15% (breakdown strength of 40 kV / cm) is processed at a intensity of 0.3-10 kV / m and air bubbling. When using a porous stainless steel plate with a pore size of 5-10 µm in the form of a circle with a diameter of 60 µm and a thickness of 2 mm, the air flow is about 1.5 liters / min, which corresponds to a specific flow rate of 0.005-0.007 per 1 m of the plate.

The average size of bubbles 800 microns, time

processing 1-60 s.

With an initial water concentration of 5 / o, a field strength of 0.6 kV / cm, an air flow rate of 1.5 l / min, and a treatment period of 75 s, the time of the subsequent settling to a residual concentration of 2.5% compared to the treatment with an electric field the same parameters without sparging decreased from 30 to 5 minutes, i.e., 6 times.

The application of the method allows to accelerate the process of subsequent settling and, therefore, reduce the volume of containers and capital and operating costs.

Claims (2)

Invention Formula I. A method of destroying a water-oil emulsion in a constant high-voltage electric field, characterized in that, with the acceleration of the subsequent settling process, air is simultaneously passed through the emulsion. 2. The method according to p; I, characterized by the fact that the process is carried out at an electric field strength of 0.3-O kV / cm. Sources of information taken into account in the examination 1. For the UK of UK No. 1459687, cl. C 5 E C C, 1976. 2. USSR author's certificate No. 390131, cl. From 10 G 33/02. 1971 (prototype).