Measurement and calculation of excess enthalpy with the isothermal microcalorimeter
Download
1 / 27

Measurement and Calculation of Excess Enthalpy with the Isothermal Microcalorimeter - PowerPoint PPT Presentation


  • 210 Views
  • Uploaded on

Measurement and Calculation of Excess Enthalpy with the Isothermal Microcalorimeter. Kwon, Jung Hun Thermodynamics and Properties Lab. Dept. of Chemical and Biological Engineering, Korea Univ. CONTENTS. I. Introduction ① The Object of Study

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Measurement and Calculation of Excess Enthalpy with the Isothermal Microcalorimeter' - rosalba


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Measurement and calculation of excess enthalpy with the isothermal microcalorimeter l.jpg

Measurement and Calculation of Excess Enthalpy with the Isothermal Microcalorimeter

Kwon, Jung Hun

Thermodynamics and Properties Lab.

Dept. of Chemical and Biological Engineering, Korea Univ.


Slide2 l.jpg

CONTENTS

I. Introduction

① The Object of Study

② Types of Calorimeter

③ Apparatus of IMC

II. Experiments & Calculations

① Procedure

② Course of HE Calculation

③ Theory : NLF-HB

④ Results & Discussions

III. Conclusion

Thermodynamics and Properties Lab.



The object of study l.jpg
The Object of Study

■ The Needs of Excess Enthalpy

► Excess enthalpy data of binary mixture are important in

understanding the nature of interactions between the molecules.

► Excess enthalpy data plays an important role in chemical

engineering process design and operation.

Thermodynamics and Properties Lab.


Types of calorimeter l.jpg
Types of Calorimeter

  • ■ Three types of calorimeter

  • : batch calorimeter, displacement calorimeter, flow calorimeter

  • ► flow calorimeter

  • ① To make measurements over a wide range of

  • pressure and temperature conditions

  • ② The measurements of the excess enthalpy can

  • be made for gases as well as liquids

  • ③ To require large amounts of chemicals

Thermodynamics and Properties Lab.


Apparatus l.jpg
Apparatus

► Model CSC 4400 (Calorimetry Sciences Corporation)

■ Pump : a set of HPLC pump ( Model Acuflow Series II )

Accuracy of flow rate :  2%

■ Auxiliary equipments

► Air bath

► Back pressure regulator

► Control gas : compressed helium gas

► Circulator ( constant temperature )

■Isothermal Microcalorimeter ( IMC )

Thermodynamics and Properties Lab.


Slide7 l.jpg

Experimental apparatus

Thermodynamics and Properties Lab.


Slide8 l.jpg

Block diagram of IMC

Thermodynamics and Properties Lab.


Slide9 l.jpg

Schematic diagram of flow mixing cell

Thermodynamics and Properties Lab.



Slide11 l.jpg

Procedure

Determination

T & P

I M C

Setting

I M C

Stabilization

Total

Flow Rate

Excess

Enthalpy

Base Line

Thermodynamics and Properties Lab.


Course of h e calculation l.jpg
Course of HE Calculation

  • ■ The raw data of experiment with IMC

X data : time , Y data : enthalpy

Thermodynamics and Properties Lab.


Course of h e calculation13 l.jpg
Course of HE Calculation

Thermodynamics and Properties Lab.


Nlf hb theory l.jpg
NLF-HB Theory

  • ▪ Assumption : consideration of hole’ non-randomness

  • Configurational partition function (Ωc)

  • Helmholtz Free Energy(Ac) derivation

  • Nonrandom Lattice Fluid Theory Eos

  • Chemical potential , Fugacity

  • application

  • • Equilibria of vapor-liquid,vapor-solid,liquid-liquid phase,

  • and Multiphase equilibria including UCST behaviors

  • • Heat of mixing non polar- non polar, non polar- polar, polar

  • - polar binary mixtures of simple and complex molecules

Thermodynamics and Properties Lab.


Nlf hb theory15 l.jpg
NLF-HB Theory

  • ■ Configurational partition function (Ωc)

  • ▪ Physical term

▪ PHYS : [ Physical term ]… You et al. (1994)

▪ HB: [ Chemical term ] … Extension of Veytsman statistics (Park et al. 2001)

Thermodynamics and Properties Lab.


Slide16 l.jpg

NLF-HB Theory

▪ Hydrogen bonding term

▣ Connection of thermodynamic function with configurational function

▣ The molar configurational internal energy for mixture

▣Expression of excess enthalpy

Thermodynamics and Properties Lab.


Nlf hb theory17 l.jpg
NLF-HB Theory

  • ■Physical Parameters

  • ① Coordination number : z=10

  • ② Lattice volume : VH = 9.75 cm3/mol

  • ③ Pure parameters (ri, ii) :

  • ④ Binary parameter (ij) :

Thermodynamics and Properties Lab.


Nlf hb theory18 l.jpg
NLF-HB Theory

■ Hydrogen Bonding Parameters

Hydrogen bonding parameters for NLF-HB EOS

alcohols

water

Thermodynamics and Properties Lab.



Results discussions l.jpg
Results & Discussions

  • Comparison of experimental HE for decane + ethanol

  • (1) 313.15K DATA ERROR = 0.88 %

  • (2) 298.15K DATA ERROR = 3.21 %

  • Thermodynamics and Properties Lab.


    Slide21 l.jpg

    Results & Discussions

    Comparison of experimental HE

    for octane + ethanol at 313.15K

    ERROR = 2.47%

    Comparison of experimental HE

    for nonane + ethanol at 313.15K

    ERROR = 3.00%

    Thermodynamics and Properties Lab.


    Results discussions22 l.jpg
    Results & Discussions

    Comparison of experimental HE for nonane + 1-butanol at 313.15K

    ERROR = 2.86 %

    Thermodynamics and Properties Lab.


    Slide23 l.jpg

    Comparison of experimental HE

    for decane + 1-butanol at 313.15K

    ERROR = 4.28%

    Thermodynamics and Properties Lab.


    Results discussions24 l.jpg
    Results & Discussions

    Comparison of experimental HE for octane + 1-butanol at 313.15K

    ERROR = 4.03%

    Thermodynamics and Properties Lab.



    Conclusion l.jpg
    Conclusion

    • 1. Excess enthalpies for the various systems were measured

    • with the isothermal microcalorimeter at 298.15K and

    • 313.15K.

    • 2. Experimental data were compared with calculated results

    • using NLF-HB EOS.

    • 3. The relative error for each system was within 5%.

    • 4. The NLF-HB EOS is applied to binary mixtures of water ,

    • alcohol, alkane, acid , and amine, etc …

    Thermodynamics and Properties Lab.


    Future l.jpg
    Future■

    • ▪ Systems : alcohol, alkane, amine, water, …

    • ▪ The simultaneous representation of VLE and excess enthalpy

    • ▪ The calculation of excess enthalpy using SAFT model

    Thermodynamics and Properties Lab.


    ad