Liquid-liquid　equilibrium　(LLE)　data　were　determined　in　the　following　systems:　three　ternary　systems　of　methyl　acetate　+　toluene　+　water,　methyl　acetate　+　benzene　+　water,　and　benzene　+　toluene　+　water　and　the　methyl　acetate　+　benzene　+　toluene　+　water　quaternary　system　at　283.2　K　under　atmospheric　pressure.　The　experimental　data　were　correlated　by　the　nonrandom　two-liquid　(NRTL)　and　universal　quasichemical　(UNIQUAC)　activity　coefficient　models,　and　the　comparison　between　calculated　and　experimental　data　shows　good　agreement.