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Marzena Dzida, Mirosław Chorążewski

T he effect of temperature and pressure on the thermodynamic and acoustic properties of pentanols at temperatures from (293 to 318) K a nd pressures up to 100 MPa. Marzena Dzida, Mirosław Chorążewski University of Silesia, Institute of Chemistry, Szkolna 9, Katowice. Investigated alcohol.

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Marzena Dzida, Mirosław Chorążewski

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  1. The effect of temperature and pressure on the thermodynamic and acoustic properties of pentanols at temperatures from (293 to 318) K and pressures up to 100 MPa Marzena Dzida, Mirosław Chorążewski University of Silesia, Institute of Chemistry, Szkolna 9, Katowice

  2. Investigated alcohol CH3  CH3  CH2  CH  CH2  OH 2-methyl-1-butanol CH3 CH2  CH2  CH2  CH2  OH pentan-1-ol CH3  CH2  CH  CH2 CH3  OH pentan-3-ol CH3  CH3  CH2  C  CH3  OH 2-methyl-2-butanol

  3. Aim: Study of the influence of the structureof the alcohol and the positionofthe hydroxyl group in the alcohol molecules on temperature and pressure dependence of the thermodynamic properties

  4. Physicochemical properties of isomeric pentanols at 298.15 K 2-methyl-1-butanolpentan-1-ol2-methyl-2-butanolpentan-3-ol K1531531085 b.p. / 0C 127.7 137.3 102.4 115.5 Hvap / kJ mol-1 54.1 56.9 51.5 52.9 Cp / J mol-1K-1213.88208.14 247.60 253.39 /kg m-3815.02810.84 804.29 817.18 r15.6315.135.78 13.35  / D 1.88 1.65 1.70 1.64 gk 2.42 2.75 0.9 2.63

  5. Experiment Ultrasonic speedmeasurements temperature range293 – 318K pressure range0.1 – 100 MPa method pulse-echo-overlap accuracy0.5 ms-1 (0.1 MPa); 1ms-1 (p  0.1 MPa) Densitymeasurements temperature range293 – 318K pressure 0.1 MPa method vibrating-tube densimeter (Anton Paar DMA 5000) accuracy0.05 kg m-3 Heat capacitymeasurements temperature range 284–368.75K pressure 0.1 MPa method differential scanning calorimeter Micro DSC III (University of Łódź) accuracy0.25 %

  6. High pressure ultrasonic cell • pressure chamber • plug • transducer • reflector • acoustic tube • high pressure capillary • high pressure cable Żak A., Dzida M., Zorębski M., Ernst S., A high pressure system for measurements of the speed of sound in liquids, Rev. Scient. Instr. (2000) 71, 1756-1768. Dzida M., Chorążewski M., Zorębski M., Mańka R., Modification of a high pressure device for speed of sound measurements in liquids, J. de Physique IV (2006)137, 203-207.

  7. Speeds of sound in 2-methyl-1-butanol plotted against temperature at elevated pressures: (●) 0.1 MPa, (▲) 30.39 MPa, (■) 60.79 MPa, () 101.32 MPa

  8. Determination of the prT data by the acoustic method Laplace formula: Isothermal compressibility is related to isentropic one by the following relationship: where

  9. Temperature dependences of the molar heat capacities of (▲) 2-methyl-1-butanol, (●) pentan-1-ol**, (■) 2-methyl-2-butanol*, and () pentan-3-ol***at atmospheric pressure *M. Dzida, P. Góralski, J. Chem. Thermodyn. 41(2009) 402-413 **M. Zábranský, V. Růžička and V. Majer, J. Phys. Chem. Ref. Data 19 (1990) 719–762 ***C. A.Cerdeiriña,J. Troncoso, D. González-Salgado, G. García-Miaja, G. Hernández-Segura, D. Bessières, M. Medeiros, L. Romaní and M. Costas, J. Phys. Chem. B 111 (2007)1119–1128

  10. Isobaric molarheat capacitiesas function of pressure of 2-methyl-1-butanol at() 293.15 K and (Δ) 318.15 K,pentan-1-ol* at(●) 293.15 K and (○) 318.15 K, 2-methyl-2-butanol* at(■) 293.15 K and (□) 318.15 K, and pentan-3-ol** at () 293.15 K and () 318.15 K(calorimetric measurement) *M. Dzida, J. Chem. Eng. Data (2009) in press **C. A.Cerdeiriña,J. Troncoso, D. González-Salgado, G. García-Miaja, G. Hernández-Segura, D. Bessières, M. Medeiros, L. Romaní and M. Costas, J. Phys. Chem. B 111 (2007)1119–1128

  11. Isobaricthermal expansion of(▲) 2-methyl-1-butanol, (●) pentan-1-ol*, (■) 2-methyl-2-butanol*, and () pentan-3-ol**at 303.15 K *M. Dzida, J. Chem. Eng. Data 54 (2009) 1034-1040**Calculated from densities reported by D. González-Salgado, J. Troncoso, F. Plantier, J. L. Daridon, D. Bessières, J. Chem. Thermodyn. 38 (2006) 893-899

  12. Isothermal compressibility of () 2-methyl-1-butanol, (●) pentan-1-ol*, (■) 2-methyl-2-butanol*, and () pentan-3-ol**at 303.15 K *M. Dzida, J. Chem. Eng. Data 54 (2009) 1034-1040 **D. González-Salgado, J. Troncoso, F. Plantier, J.L. Daridon, D. Bessières, J. Chem. Thermodyn. 38 (2006)893-899.

  13. Internal pressure Internal pressure is related to a work of intermolecular forces that accompany the change of volume.

  14. pentan-1-ol 2-methyl-2-butanol pentan-3-ol 2-methyl-1-butanol Pressure dependence of internal pressure (●) 293.15 K; (○) 298.15 K; (■) 303.15 K; (□) 308.15 K; (▲) 313.15 K; (Δ) 318.15 K () 323.15 K;() 333.15 K; (+) 343.15 K; (ӿ) 353.15 K; (—) 363.15 K; (-) 368.15 K

  15. Summary Heat capacity, isobaric thermal expansion, and isothermal compressibility The effect of pressure on isobaric heat capacity andisobaric thermal expansionfor 2-methyl-1-butanol and pentan-1-ol is smaller than that for 2-methyl-2-butanoland pentan-3-ol and for isothermal compressibility this effect is the highest for 2-methyl-2-butanol Internal pressure For 2-methyl-2-butanol, pentan-1-ol, and pentan-3-olthecrossing points of the isotherms of internal pressure are observed. For 2-methyl-2-butanol, pentan-1-ol, and pentan-3-olthe internal pressuredecreases with increasing temperature at pressures up to the crossing point and then it increases with the increase of temperature. For2-methyl-1-butanolthe internal pressure increases with increasing temperature.  For2-methyl-1-butanol, pentan-1-ol, and pentan-3-olthe internal pressure as function of pressure shows maximum.  For2-methyl-2-butanol,the internal pressure increases with increasing pressure.

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