Viscosities of binary mixtures containing 1-butanol + 2,2,4-trimethylpentane or + 1,2,4-trimethylbenzene at high pressures for the thermophysical characterization of biofuels

•Viscosity behaviour of 1-butanol and its mixture with 2,2,4-trimethylpentane or 1,2,4-trimethylbenzene is reported.•Measurements were carried out up to 140 MPa and temperature range from (293.15 to 353.15) K.•The data were correlated using a modified VFT.•The fitting results are good and agree with the measurement uncertainties.

A wide variety of oxygenated additives from renewable origin may be used in next-generation biofuels.In order to contribute to the international effort aimed at developing and using environmentally sustainable fuels, the present study focuses on the thermophysical characterization of new blends of hydrocarbons and 1-butanol (known as a second generation biofuel) through viscosity measurements.A vibrating-wire viscometer was developed to accurately measure dynamic viscosities at T = (293.15–373.15) K and p = (0.1–140) MPa. The relative expanded uncertainty of the dynamic viscosity was estimated at 1.5% for a coverage factor k = 2.As an initial characterization of biofuels, the dynamic viscosities of (1-butanol + 2,2,4-trimethylpentane) and (1-butanol + 1,2,4-trimethylbenzene) mixtures, as well as 1-butanol, are reported at different temperature and pressure conditions.