Isobaric　vapor-liquid　equilibrium　(VLE)　data　for　three　binary　systems　(PM　+　PMA,　MeAc　+　PM　and　MeOH　+　PMA)　at　101.3　kPa　were　measured　in　a　double　circulating　still　of　modified　Othmer　type.　The　thermodynamic　consistency　of　the　experimental　data　was　checked　by　Herington　method.　The　experimental　data　were　correlated　with　NRTL　and　Wilson　models.　The　binary　interaction　parameters　of　both　models　have　been　obtained　by　simplex　method.　The　root　mean　square　deviations　(RMSD)　for　the　vapor　phase　fraction　and　the　boiling　temperature　are　less　than　0.01　and　0.5　K,　respectively.　The　results　indicate　that　the　calculated　values　by　NRTL　and　Wilson　models　are　in　good　agreement　with　the　experimental　data　and　no　azeotropic　behavior　has　been　found　in　the　three　binary　systems.　The　research　findings　would　provide　basic　data　for　the　design　and　analysis　of　distillation　process.　(C)　2014　Elsevier　B.V.　All　rights　reserved.