The one-fluid model of equation of state and thermodynamic description of boundary states are used to study global equilibrium surface of two-component Lennard-Jones fluids. The global phase diagram for equal size molecules with seventeen separate regions is reported. The new type of phase behaviour is distinguished.The great variety of phase behaviour which was found for binary fluid mixtures is conditioned by intermolecular interaction. The successive theoretical approach to the analysis of the observed phase phenomena in terms of microscopic characteristics is usually restricted by the models of lattice gas in the local regions of the thermodynamic equilibrium sur. face. The global analysis of the equilibrium surface of coexisting fluid phases was reported only for the binary van der Waals mixtures [1,2]. The topological structure, created by the one-fluid van der Waals model, is of such a kind that it reflects many qualities of phase behaviour which were discovered by means of the binary systems that were already studied experimentally. There are, however, some reasons to require this model to be defined more exactly. In the first place, there is no direct correlation between the equation of state parameters and the characteristics of the intermolecular potentials; secondly, essential quantitative discrepancy in predicting the properties for the given binary mixtures is observed; thirdly, the true asymptotic behaviour of the equation of state at the high density limit is not realized. Among more f= ~
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