«Environmental protection in oil and gas complex»

Separation of oil-water emulsions polluting the environment by acetate cellulose membranes modified by a unipole corona discharge

UDC: 628.54
DOI: 10.33285/2411-7013-2022-4(307)-14-20

Authors:

¹ Kazan National Research Technological University, Kazan, Russia
² Tupolev Kazan National Research Technical University, Kazan, Russia

Keywords: oil-water emulsion, cellulose acetate membrane, corona discharge, membrane separation, hydrocarbons

Annotation:

Separation of oil-water emulsion based on oil from Carboniferous deposits by flat acetate cellulose membrane filters with a pore size of 0,45 μm was studied in order to prevent environmental pollution. To increase the resistance to oiling, cellulose acetate membranes were treated in the corona discharge field at a voltage of 5…25 kV within 1…5 min. An increase in the productivity from 2,5 to 8,6 dm3/(m2∙h) and the efficiency of emulsion separation from 80 to 99 % was revealed. Instrumental methods of the analysis proved a decrease of the wetting edge angle from 72,5 to 64,6°, a decrease of protrusions height from ≈ 1,6 to 0,5 microns, the formation of positive charges, thus indicating the course of restructuring processes that contribute to a change in the mass transfer characteristics of the filter. It was revealed that modification of membranes by corona discharge brings an increase of their productivity and the degree of oil-water emulsion purification as well as the improvement of the hydrophilic properties of the membrane itself.

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