Phase equilibria for the [{water + 1-methylnaphthalene + p-xylene}] system at T = (573, 623 and 653) K

► Phase equilibria for water + hydrocarbon ternary mixture were measured by flow method. ► Phase equilibrium measurements were performed in various feed compositions. ► Region of VLE is expanded by increasing feed compositions of heavy oil. ► Vapor + liquid + liquid equilibria were found at 573 K for this ternary system.