Conditions of phase stability in gasoline-methanol systems

Phase stability in gasoline-methanol systems was investigated in a wide range of methanol concentrations. The effect of added isobutanol (from 3 to 15%) and water (from 0.07 to 2%), and the hydrocarbon makeup of the gasolines, on the stratification of the systems was studied. It is shown that an increase of the concentration of aromatic hydrocarbons in the gasolines and the addition of isobutanol permits the stratification temperature of the gasoline-methanol mixtures to be lowered. The addition of water in the amount of 0.3 to 0.5% leads to stratification of mixtures at temperatures above 0/sup 0/C. 6 references, 5 figures, 1 table.