Speeds of Sound, Densities, and Isentropic Compressibilities of 1-Chlorohexane at Temperatures from (293.15 to 413.15) K and Pressures up to 200 MPa

Abstract

Experimental speeds of sound and densities are presented for the liquid phase of 1-chlorohexane. The measurements were carried out along seven isotherms from (293.15 to 413.15) K at pressures from saturation up to 200 MPa. The speed of sound was measured by a pulse-phase echo ultrasonic device at a frequency of (1 and 5) MHz with an uncertainty of ± 0.2 %. The density was measured by an acoustic piezometer with an uncertainty of ± 0.3 %. The experimental results have been used to calculate isentropic compressibility (k S)with an uncertainty of ± 1 %. The temperature and pressure variation of sound speed, density, and isentropic compressibility are discussed. The experimental results were used to calculate various thermophysical properties such as isobaric thermal expansion coefficient (α P), isothermal compressibility (k T), temperature coefficient of pressure at constant volume ((∂P/∂T) V ), and internal pressure (P i).

Thermophysical Properties of the Medium-Chain 1-Alkyl Halides in a Wide Range of Conditions: New Experimental Data and Predictions of CP-PC-SAFT and FT-EOS

“…These procedures have been described in great detail in previous studies. 4,5 The highest temperature limit of measurements was defined by the boundary of a thermal stability of the substances around 413.15−423.15 K. The results are displayed in Tables S2 and S3.…”

“…This time we report experimental and interpolated data on thermophysical properties of 1-chloroheptane and 1-iodoheptane at 216.08 ≤ T ≤ 423.1 K and 0.1 ≤ P ≤ 196.1 MPa. The current analysis covers also the previously published results for 1-iodohexane, 4 1chlorohexane, 5 and 1-chloropropane 6 in similar P−T ranges, along with the volumetric properties of 1-alkyl bromides 7,8 and the eminent 9 data 10−13 of Percy Williams Bridgman at very high pressures. Unfortunately, no elevated pressure data are available in open sources for the medium-chain 1-alkyl fluorides.…”

Speed of Sound and Density of 1-Chloropropane in the Range of Temperatures 180–373 K and Pressures up to 196.1 MPa

“…The temperature of samples placed into the thermostat (the absolute error of temperature stabilization is equal to ±0.05 K), which was measured by the platinum resistance thermometer providing the absolute error 0.01 K. The corrections respectively to the temperature and pressure dependence of the acoustic path were taken into account; see more details on the experimental setup and methodology elsewhere. 12,13 The isobaric heat capacity was measured by the industrial dynamical calorimeter ITC p -400 at atmospheric pressure. The resulting calculations of the isobaric heat capacity gave results, which have the relative error not exceeding ±5% over the whole temperature region explored.…”

“…Within the single phase region, the measurements of the density and the speed of sound were evaluated along isotherms with the step 20 K. The external pressure was produced by the dead-weight pressure gauge MP-2500 with the step 10 MPa with the relative error ±0.02%. The temperature of samples placed into the thermostat (the absolute error of temperature stabilization is equal to ±0.05 K), which was measured by the platinum resistance thermometer providing the absolute error 0.01 K. The corrections respectively to the temperature and pressure dependence of the acoustic path were taken into account; see more details on the experimental setup and methodology elsewhere. , …”

CHAPTER 13. Ultrasonics 2: High Pressure Speed of Sound, Isentropic Compressibility

“…Bolotnikov et al [45][46][47][48] and Hasanov et al 49,50 reported the u(T,P) for mainly liquid n-alkanes. Daridon and colleagues 51-68 have measured u(T,P), for ethers, esters and n-alkanes.…”