Electrical dewaxing of the oil raffinate fraction 420-490 оС

Abstract

Industrial dewaxing of oil raffinates remains the most expensive, complex, low-temperature process in the production of mineral base oils in refining. The development of an alternative, simpler and less energy-intensive method of dewaxing is an urgent task.This article investigates the possibility of dewaxing oil refining in the presence of different classes of depressor additives in a constant inhomogeneous electric field at positive temperatures.A correlation was established between the depressant properties of the additives and their effectiveness in electric field dewaxing.The maximum depressant effect of the additive in the oil raffinate corresponds to the highest indicators of the electrical dewaxing process.The effect of separating oil raffinate in an electric field with ester additives depends on the chemical structure of the dicarboxylic acids used in their synthesis.The nature of the distribution of the additive between the phases has been revealed by changes in the pour point of the resulting dewaxed oil.This article shows the relationship between the magnitude of the electrical charge of paraffin crystals and the time of dewaxing. This is related to the polarisation of the double electric layer of particles in an electric field and their subsequent dipole-dipole interaction.