Thermophysical properties of 1-butanol over a wide range of temperatures and pressures up to 200 MPa

摘要

(p,rho,T) Data of 1-butanol over a wide range of temperatures IT = (263.15 to 468.15) K] and pressures up top = 140 MPa are reported with an estimated experimental relative combined standard uncertainty in density of.6,p/ p = +/- (0.01 to 0.03) %. The measurements were carried out with a newly constructed Anton Paar DMA HPM vibration tube densimeter. The system was calibrated using double-distilled water, aqueous NaCI solutions, methanol, toluene and acetone. An equation of state (EDS) for fitting of the (p,rho,T) data of 1-butanol has been developed as a function of pressure and temperature. The experimental (p,rho,T) data have been successfully extrapolated up to temperatures T = 253.15 K and pressures up top = 200 MPa using the equation of state. After a thorough analysis of literature values and validity of the constructed equation of state, various thermophysical properties such as isothermal compressibility, isobaric thermal expansibility, differences in isobaric and isochoric heat capacities, thermal pressure coefficient, internal pressure at temperatures [T = (253.15 to 468.15) K] and pressures up top = 200 MPa were calculated. Additionally, heat capacity of 1-butanol at temperatures T = (253.15 to 468.70) K and at ambient pressure were measured using a differential scanning calorimeter. After these measurements some more calculations of further thermophysical properties at temperatures [T= (253.15 to 468.70) K] and pressures up top = 200 MPa, like specific heat capacities at constant pressure and volume, speed of sound and isentropic expansibility, have been executed. (C) 2015 Elsevier B.V. All rights reserved.