Heat Capacities in the Solid and in the Liquid Phase of Isomeric Pentanols

Abstract

Isobaric heat capacities in the liquid and in the solid phases of seven isomeric pentanols were measured by adiabatic calorimetry. Results obtained cover the following temperature ranges: 2-methyl-1-butanol from 85 K to 301 K; 2-methyl-2-butanol from 84 K to 301 K; 3-methyl-1-butanol from 79 K to 158 K; 3-methyl-2-butanol from 85 K to 301 K; 2,2-dimethyl-1-propanol from 6 K to 381 K; 2-pentanol from 80 K to 301 K; and 3-pentanol from 5 K to 309 K. The temperature and enthalpy of phase transition were also determined. Solid to solid and solid to liquid phase transitions were detected for 2-methyl-2-butanol and for 2,2-dimethyl-1-propanol, and a solid to liquid phase transition was detected for 3-pentanol. Only a glass to liquid phase transition was detected for all the remaining compounds. The heat capacity data in the liquid phase obtained in this work were merged with available experimental data from the literature and critically assessed, and sets of recommended data were developed by correlating selected data as a function of temperature.

Molar heat capacities for (2-methyl-2-butanol+heptane) mixtures and cyclopentanol at temperatures from (284 to 353)K

“…Additionally, the isobaric specific heat capacities of 2-methyl-2-butanol and cyclopentanol were measured over the temperature range from (284 to 368) K and (284 to 353) K, respectively. To the best of our knowledge, the temperature dependence of the molar heat capacities of these liquids has been reported for the temperature range from (267.6 to 347.6) K [17,36,39] and from (256.3 to 302.9) K [17], respectively.…”

“…This work Literature Heptane a n D 1.3852 1.3851 [18], 1.3852 [19,20], 1.3853 [21], 1.3855 [22] q/(kg Á m À3 ) 679.53 679.48 [23], 679.56 [21], 679.57 [24], 679.60 [25], 679.7 [26] 2-Methyl-2-butanol n D 1.4025 1.40237 [27], 1.40238 [28,29], 1.4024 [30] q/(kg Á m À3 ) 804.32 804.25 [31], 804.257 [32], 804.33 [33,34], 804.37 [35], 804.5 [28,30] C p,m /(J Á mol À1 Á K À1 ) 247.44 242.96 [36], 247.61 [17], 251.1 [37] Cyclopentanol n D 1.4512 1.4505 [38], 1.45159 [38] q/(kg Á m À3 ) 942.86 942.91 [38], 942.97 [35] C p,m /(J Á mol À1 Á K À1 ) 181.82 182.21 [17] a Comparison of C p was given in [16].…”

Reversible and irreversible colossal barocaloric effects in plastic crystals

“…3) so that S (T, p) = S(T, p) − S(T 0 , p atm ). For this purpose we have followed the procedure described in Refs 5,52,53 according to which we need integration of our pressure-dependent calorimetric peaks after baseline subtraction and temperature-dependent heat capacity C p from literature (NPA: 54 ; AMP: 55 ; PG: 56 ; TRIS: 57,58 ). The fact that C p data is available only at normal pressure prevents us to determine the pressure dependence of the isobaric entropy in each phase directly from this quantity.…”

Study of the Effects of Temperature and Pressure on the Thermodynamic and Acoustic Properties of 2-Methyl-1-butanol at Temperatures from 293K to 318K and Pressures up to 100MPa

“…Speed of sound (m · s −1 ) 1253.09 1253 [11], 1253.29 [12] Density (kg · m −3 ) 815.02 814.87 [11,12], 815.02 [13], 815.09 [14] Refractive index 1.4086 1.4086 [12], 1.40872 [12] Molar heat capacity (J · mol −1 · K −1 ) 213.88 212.16 [15], 215.0 [16] method. Two measuring vessels of the same acoustic path and construction (a single transmitting-receiving ceramic transducer and an acoustic mirror) have been used.…”