Research And Application Of Additives On Gasoline Which Modified By Methanol

Methanol, as the chemical basis energy,comperes with a great number of different raw and renewable materials, which get more attention by the word gradually for its several physical and chemical properties similar to gasoline, simple synthesis, wide variety of sources, low price et al. The development and promotion of the coal-based methanol fuel as a gasoline alternative fuel is one of the feasible options in the case of that the oil resources is dwindling and the worsening environment pollutions.In this paper, the best single additive could be filtered out by examining the phase separation temperature which conclude alcohols, esters, surfactants in different ratios of methanol gasoline (M10, M20, M30, M40, M50, M60). Then, Effect of the compound additives of the phase stability were studied through investigating phase separate temperature under different category and content of different compound.Therefore, the final compound solution and content were confirmed. Experimental results showed that:methanol and gasoline was miscible with high aromatic hydrocarbon content and the phase separate temperature could drop3"C per the aromatic hydrocarbon increased2%. For the alcohol additives, high alcohols performed a better hydrotropy than low alcohols, and the additives compound of high-low carbon alcohols were better than the compound of high-high carbon alcohols or low-low carbon alcohols. The hydrotropy of two-component alcohols is better than the single while the additives were large, on the contrary, compered with the two-component alcohols, the single phase alcohols had superior hydrotropy under the small amount of additive. Compared with alcohols and surfactants, the esters performed poor inter-solubility.For the surfactants under the same composition system in anhydrous methanol-gasoline blends, as the HLB lessen, the phase separate temperature lessen, that is to say the phase stability of the blends was better. However, for the surfactants with different composition, the hydrotropy of the blends was diverse even if the HLB were equally. The study revealed that the anhydrous methanol-gasoline blends displayed the best hydrotropy when the HLB of the compound surfactants is2.In addition to investigated the hydrotropy of additives of methanol-gasoline blends, the study found that the phase separation temperature and the minimum dosage of additives could be used to evaluate the phase stability of methanol-gasoline and the two evaluations had a similar results. The additive of optimal hydrotropy were used to exam the maximum water content of methanol gasoline at room temperature. In addition to these, draw the methanol-gasoline-water triphase diagram,and discussed the the water-resisting property of methanol-gasoline. and test the physical and chemical properties of the M30with the additive of optimal hydrotropy such as the phase stability, vapor pressure, distillation range, the content of benzene and aromatics. Finally combined the blends with the theory of solubility parameter, although the solubility parameter were not entirely suitable for the screening of the additive in methanol-gasoline blends, but had a certain value for reference.