Polycondensation depressor additives for oil products using higher fat alcohols

There are polycondensation ester depressant additives, obtained by the condensation of polyhydric alcohols, synthetic fatty acids and dicarboxylic acids. The effectiveness of such additives is limited to oils and petroleum products containing high melting solid hydrocarbons. Such additives are not effective in diesel fuels. Therefore, it was of interest to synthesize condensation ester depressor additives with a different combination of starting materials. We used pyromellitic dianhydride (it is a product derived from polyhydric acid) as a base, also higher fatty alcohols as substances that add additives to the surface-active properties and solubility in oils and petroleum products, and glycols, for example ethylene glycol, as substances that regulate the molecular weight of additives.  Depressor additives were synthesized by condensation of higher fatty alcohols fractions C10 – C20 and pyromellitic dianhydride with the subsequent introduction of ethylene glycol into the structure of additives.  We evaluated the depressor properties of the additives when they were introduced into the diesel component of the Surgut condensate stabilization plant. Additives were considered all the more effective, the higher the depression of the pour point of the oil in their presence and the lower their consumption.  We introduced into the diesel component of the Surgut condensate stabilization plant, and then evaluated their properties. The higher the depression of the pour point of the oil when using depressor additives and the lower their consumption, the additives were considered more effective.  Taking into account the simplicity of the technology, waste-free production and sufficiently high efficiency, we can recommend the depressor additives synthesized in the study to reduce the solidification temperature of diesel fuels.