Synthesis and Evaluation of Wax Dispersant for Diesel

Abstract

In this paper, the content and carbon number distribution of n-alkanes in the three diesel fuels were analyzed by high-temperature gas-phase chromatography. The diesel distillation ranges were determined by a distillation analyzer. Phthalic anhydride−polyethylene glycol ester (PAP) was prepared by using phthalic anhydride and polyethylene glycol (PEG) as the reactant; after that, PAP was reacted with hexadecanol to produce PAPE. The expected products were identified by 1 H NMR spectra. Factors such as the molecular mass of PEG on the wax dispersant for the diesel effect of PAP and PAPE for Yanhua hydrogenation diesel were studied. It is shown that the cold filter plugging point (CFPP) can be depressed 5 and 4 °C, respectively. The compositions of wax dispersant and the pour point depressants (PPDs) were investigated. At the same time, the suppressing wax separation test was evaluated, and the effects on reducing the CFPP of diesel oils were studied also. The results showed that the complex of wax dispersant and PPD with vinyl acetate monomer had good synergism. What's more, both PAP and PAPE have the effect on depressing the CFPP for three diesel samples for a certain degree; besides, it had the function of suppressing the wax separation.

Effect of Pour Point Depressants Combined with Dispersants on the Cold Flow Properties of Biodiesel‐Diesel Blends

“…The use of biodiesel from waste cooking oil (BWCO) as engine fuel can reduce the consumption of petroleum‐based diesel, thereby reducing waste oil emissions and improving the environment (Cao et al, 2014b; Wang et al, 2015; Xue et al, 2016a). However, the poor cold flow properties lead to the quickly gel or solidification of biodiesel in the fuel tanks at low temperature, which eventually affect the use of biodiesel fuels in the diesel engine (Feng et al, 2014; Moser, 2014b; Xue et al, 2016b; Zheng et al, 2014).…”

Effect of Pour Point Depressants Combined with Dispersants on the Cold Flow Properties of Biodiesel-Diesel Blends

“…The use of biodiesel from waste cooking oil (BWCO) as engine fuel can reduce the consumption of petroleum-based diesel, thereby reducing waste oil emissions and improving the environment Wang et al, 2015;. However, the unpleasant cold flow properties always prevent biodiesel fuels from being directly added to diesel engines Zheng et al, 2014;Feng et al, 2014).…”

Influence of Tetradecyl Methacrylate-N-α-methacrylamide Copolymers as Pour Point Depressants on the Cold Flow Property of Diesel Fuel

“…Diesel fuel is a product with a middle distillation range from petroleum, which easily crystallizes and gelatinizes at low temperatures. − The crystallization and precipitation of wax at low temperatures tend to result in the formation of a three-dimensional network structure and thus in the blockage of filters and nozzles of diesel engines, thereby leading to poor cold flow properties. , The weaker cold flow properties of diesel are one of the key factors limiting its cryogenic application. − …”