Разделение водонефтяной эмульсии полиакрилонитрильными мембранами, модифицированными в коронном разряде

Abstract

It is investigated the influence of the parameters of the unipolar corona discharge (the treatment time, voltage) on the performance and selectivity of separation of model emulsions “oil in water” based on the oil in the Devonian deposits Tomatocage field (Republic of Tatarstan) using polyacrylonitrile membranes with a molecular weight cut-off of 60 kDa particles. Determined COD values of the original emulsions and filtrates. The values of the processing time (30 seconds) and voltage of the corona (5 kV) membranes, which achieved the best performance and selectivity of the separation process of oil-water emulsion. Sitting drop methods, x-ray diffraction and atomic force microscopy showed changes of the surface structure and internal structure of treated membrane. In particular, there was decrease in the wetting angle from 45.1 to 43.3 and an increase in the degree of crystallinity from 0.15 to 0.18, which is due to the flow on the surface of PES membrane processes of etching and oxidation resulting from exposure to a unipolar corona discharge ozone, which is also confirmed by images of the surface of the filter elements and the histograms of the topography, based on which it showed a decrease in height and number of protrusions from 42 nm and 7500 to 10 nm and 2500.