Impact of Alkyl Methacrylate-maleic Anhydride Copolymers as Pour Point Depressant on Crystallization Behavior of Simulated Diesel Fuel

摘要

The alkyl methacrylate-maleic anhydride copolymer (RMC-MA) is widely used as a pour point depressant. In order to develop more efficient RMC-MA, it is necessary to study the crystallization behaviour of N-alkanes when adding RMC-MA to simulated diesel fuel. In this study, RMC-MA was prepared by the reaction of long-chain alkyl methacrylate and maleic anhydride. The simulated diesel fuel before and after adding C14MC-MA were filtered at the cold filter plugging point (CFPP )in a manual CFPP apparatus, Extensive measurements of the variation of the composition of N-alkanes was done by gas chromatography and the results were compared. The experimental results show that, (1) the recover ratio of the stimulated diesel fuel and fuel with additive are 98.6% and 98.1%, respectively; (2) the distribution of the concentrations of N-alkanes in the filtrate is basically similar to that of the simulated fuel. The distribution of concentrations of N-alkanes in the precipitate exhibits a slight decrease in the concentration of low carbon number N-alkanes concomitant with an increase in the concentration of high carbon number N-alkanes, and no octane existed in the solid; (3) The crystalloid of N-alkanes in stimulated diesel fuel and fuel with additive increase with the increasing N-alkanes number. With the C14MC-MA copolymers added into stimulated diesel fuel, the crystallirity of octadecane and eicosane were decline, and those of N-alkanes with carbon number from 12 to 16 show a tiny increased trend.