Synthesis of a new type of pour point depressant and its effect on the rheological properties of model wax oil

Abstract

Graft modification of commercial EVA PPDs to prepare new PPDs with high performance is a research hotspot in the crude oil pipelining industry. However, the acting law and mechanism of the grafted EVA PPDs were still unclear. In this paper, based on commercial EVA PPD (EVA2803), EVA-18 with side alkyl chain length 18 was synthesized by a new reaction pathway of " alcoholysis-acyl substitution ". The effect of EVA on asphaltene-free model wax oil before and after modification was studied. Through a series of experiments, the influence mechanism was revealed. We believe that the eutectic effect between modified EVA PPD and paraffin determines the properties of ppd. With the increase of the length of the side alkyl chain, the eutectic effect is enhanced and the freezing point decreases to 4℃. These findings provide valuable insights into the role of alkyl side chain length in optimizing EVA-based PPD, offering promising approaches to addressing flow assurance issues in the pipeline transport of waxy crude oils.