乙酸酯对甲醇-直馏汽油体系相稳定性的影响

通过对甲醇-直馏汽油体系相分离温度的测定，考察了一系列乙酸酯作助溶剂对甲醇-直馏汽油体系低温相稳定性的影响。结果表明：在实验温度-27~36 ℃范围内，乙酸甲酯、乙酸乙酯、乙酸丙酯、乙酸丁酯、乙酸戊酯和乙酸异戊酯对M15，M30，M50，M65甲醇-直馏汽油体系皆有一定的相稳定作用，且随着烷烃中碳数由1增加到5，其作用效果增强；在各体系中，乙酸丁酯和乙酸戊酯相对于其它乙酸酯对甲醇-直馏汽油体系起到了较好的相稳定作用，-20 ℃时乙酸戊酯作用效果最好，加量约15%时保持体系处于相稳定状态；通过乙酸丁酯、乙酸戊酯和乙酸异戊酯对甲醇-直馏汽油体系的相稳定作用的研究，探讨了烷氧基异构化对甲醇-直馏汽油体系相稳定的影响。

EFFECT OF ACETATE ESTER ON THE PHASE STABILITY OF METHANOL-STRAIGHIT-RUN GASOLINE BLENDS

Effect of a series of acetate ester co-solvents on the phase stability of methanol-straight-run(SR) gasoline blends was studied by testing the phase separate temperature of these blends.Results show that methyl acetate,ethyl acetate,propyl acetate,butyl acetate,amyl acetate and isoamyl acetate all have positive effect on the phase stability of a series of methanol-SR gasoline blends with various blending ratios(M15,M30,M50 and M65) in the temperature range of-27 ℃ to 36 ℃,and this effect enhances with the increase of carbon number in the oxyalkyl of acetate ester.The effect of alkoxy isomerization on the phase stability of methanol-SR gasoline blends was studied by comparing the phase stabilities of these blends containing butyl acetate,amyl acetate and isoamyl acetate respectively.