POLYMERIC ADDITIVES FOR IMPROVING THE FLOW PROPERTIES OF WAXY DISTILLATE FUELS AND CRUDES

Propenoxylated tetraethylenepentamine adduct was prepared by the react ion of tetraethylenepentamine (TEPA) with propylene oxide (PO). Four a -olefin-maleic anhydride copolymers (OMACs) previously synthesized wer e esterified with the synthesized adduct successively. They were also subjected to esterification with saturated long-chain alcohol blend NA FOL 20(+) and amidation with TEPA. The prepared polymeric products wer e purified and characterized, then evaluated for improving the cold fl ow properties of a waxy gas oil blend and Umbarka waxy crude. In addit ion, they were compared with a commercial wax dispersant. The results show the high efficiency of these additives in improving the flowabili ty of both distillate fuel and crude, while the filterability of the g as oil blend was slightly ameliorated. The results are interpreted on the basis of the structure of the additives and distillate composition . Copyright (C) 1996 Elsevier Science Ltd.