Density and speed of sound measurements of 1- and 2-butanol

Liquid density of biofuel mixtures: (Dibutyl ether+1-butanol) system at pressures up to 140MPa and temperatures from (293.15 to 393.15)K

“…The density of pure DBE is reported in [6] and the density of pure 1-butanol is reported in [5]. Note here that very recently [15] the density of pure 1-butanol has been measured from (278.15 to 470) K, and up to 50 MPa. The agreement of data reported in [15] with our data reported in [5] is quite good, being the absolute average difference less than 0.04% in the same temperature and pressure ranges (290 to 410 K and up to 50 MPa).…”

“…Figure 1(b) and (c) show the variation of density as a function of pressure at T = (333. 15 and 393.15) K at different mole fractions of dibutyl ether: x 1 = 0.1553, 0.4979, and 0.8501. Following the same behaviour, density increases when pressure increases.…”

Liquid density of oxygenated additives to biofuels: 2-Butanol at pressures up to 140MPa and temperatures from (293.15 to 393.27)K

“…Therefore, the database for thermophysical properties of this compound, at present, is scarce and limited (five papers). Notice that in the recent studies [7,8] the declared uncertainty is around 0.025% and 0.001% but with narrow pressure interval (up to 25 and 50 MPa). There are only 3 old references [4][5][6] with maximum pressure above 206.5 MPa but with temperature below 348.15 K. Moreover, the results of 2-butanol density have not measured directly from experimental data but it was calculated from other properties; specific volume [4,5] compression [6] and therefore the deviations obtained do not reflect the accuracy of experimental data of 2-butanol density.…”

“…BðTÞ Figure 2 shows the deviation plots between the measured and calculated densities for 2-butanol with equations (6)- (8) successively. Notice that the D AAD is lower than the experimental uncertainty and that the maximum deviation D MD , the standard deviation (r) and D RMSD are quite low (see table 2).…”

“…At high pressure, liquid densities for 2-butanol have been measured successively by Sahli et al [4] [8].…”