Physical properties of 3-methyl-N-butylpyridinium tetracyanoborate and 1-butyl-1-methylpyrrolidinium tetracyanoborate and ternary LLE data of [3-mebupy]B(CN)4 with an aromatic and an aliphatic hydrocarbon at T = 303.2 K and 328.2 K and p = 0.1 MPa

► Density, viscosity, surface tension, heat stability, and heat capacity of two new ILs are determined. ► LLE data were measured for [3-mebupy]B(CN)4 and an (aromatic + aliphatic) hydrocarbon. ► The LLE data were modeled with the NRTL model.