Abstract
The gas-oil feedstock was solvent extracted with pyrrolidone (NMP) at different temperatures (50°C–70°C) and at different solvent feed ratios (ranging from 2/1 to 5/1). The raffinates were treated with four flow improver additives—two synthesized improvers (poly NAFOL 1822C palmitate-Co-N,N ditallowamine phthalic diamide and poly NAFOL 1822C palmitate Co-N,N ethanolamine phthalic diamide) and two available commercial improvers 2437 (Com. 1) and commercial wax dispersant CWD-11 (Com. 2) to study their efficiencies and suitabilities for improving the rheological properties. The efficiency of the additives in reducing the pour point of gas oil and their raffinates is in the order: Sec. > Et. > Com. 1 > Com. 2.
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