THERMODYNAMIC PROPERTIES OF METHYLENE CHLORIDE BY SESHADRI, D. N., VISWANATH, D. S. AND KULOOR, N. R. (Departmeni of Chemical Engineering, Indian Institute of Science, Bangalore-12, India) ! 1 [Received : November 5, 1966] ABSTRACT Thermodynamic properties of methylene chloride have been computed upto a temperature of 750° K and a pressure of 200 atmospheres using Martin and Hou Equation of State. The results are presented in tabular form and as an entropy- temperature diagram. INTRODUCTION Methylene chloride is used as a refrigerant and hence a knowledge of its thermodynamic properties is necessary. A detailed literature survey revealed that the thermodynamic properties of methylene chloride are available only upto a temperature of 423 ° K and a pressure of about 2.6 atmospheres. In the present work, tables and a diagram of thermodynamic properties of methylene chloride upto a temperature of 750 ° K and a pressure of 200 atmospheres are presented. SURVEY OF EXISTING DATA I. Critical Constants; The critical pressure and temperature of methy- lene chloride as given by Kobe and Lynn 6 have been used for the present The critical volume of methylene chloride was calculated using Meissner's ° method, Vowel's ° method, and by extrapolating the rectilinear diameter to the critical temperature. The critical volume calculated by the last method was found to be in good agreement with the critical volumes calculated by Meissner's and Vowel's method, and hence was accepted for the present investigation. Thus, the critical constants used in this work are : T, 510.0 ° K Pc r-- 60.0 atmospheres ala 0.181 litres/mole. 117 investigation. •
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THERMODYNAMIC PROPERTIES OF METHYLENE CHLORIDE
BY SESHADRI, D. N., VISWANATH, D. S. AND KULOOR, N. R.
(Departmeni of Chemical Engineering, Indian Institute of Science, Bangalore-12, India) !
1 [Received : November 5, 1966]
ABSTRACT
Thermodynamic properties of methylene chloride have been computed upto a temperature of 750° K and a pressure of 200 atmospheres using Martin and Hou Equation of State. The results are presented in tabular form and as an entropy- temperature diagram.
INTRODUCTION
Methylene chloride is used as a refrigerant and hence a knowledge of its thermodynamic properties is necessary. A detailed literature survey revealed that the thermodynamic properties of methylene chloride are available only upto a temperature of 423 °K and a pressure of about 2.6 atmospheres.
In the present work, tables and a diagram of thermodynamic properties of methylene chloride upto a temperature of 750 °K and a pressure of 200 atmospheres are presented.
SURVEY OF EXISTING DATA
I. Critical Constants; The critical pressure and temperature of methy-
lene chloride as given by Kobe and Lynn6 have been used for the present
The critical volume of methylene chloride was calculated using
Meissner's° method, Vowel's° method, and by extrapolating the rectilinear
diameter to the critical temperature. The critical volume calculated by the
last method was found to be in good agreement with the critical volumes calculated by Meissner's and Vowel's method, and hence was accepted for the present investigation.
Thus, the critical constants used in this work are :
T, 510.0 °K
Pc r-- 60.0 atmospheres
ala 0.181 litres/mole.
117
investigation.
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Thermodynamic Properties of Methylene Chloride 119
The maximum and average absolute deviations were found to be 0.46% and 0.15% respectively. Equation [21 has been used for the present investigation.
5. Heat Capacity of the Saturated Liquid : The heat capacity of saturated liquid has been presented by Dzung t . These data have been utilized in checking the internal consistency of the tabulated results.
6. Latent Heat of Vaporization: The heats of vaporization of methylene chloride have been presented by Dzung 3. These data were fitted to an equation of the form :
[3]
with n-r-- 0.41 and AO = 9.062.
The maximum and average absolute deviations of calculated values of heats of vaporization, in the range of available data were found to be 0.1% and 0.04% respectively. For this work, Equation [31 has been accepted for the calculation of latent heats of vaporization.
CALCULATION OF THERMODYNAMIC PROPERTIES
For the calculation of thermodynamic properties, Martin and Hou Equation of State,
RT A2 # B2T + C2e- KT1 Tc As B37 4- C3e -ICTITe P
/1„) (V— + +
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A 4 B5T 4- C se– KTITc
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with K= 5.475 has been used.
The constants in Equation [41 evaluated following outlined the authors' are :
130 = 3.307556 x 1(1 2
A2— — 16.355163
B2 Pa 1.1851555 x 10 -2
C2 Ca 333.17645
43 a 2.1346826
113 a — 1 . 4 1 263 0 x 10 -3
C3 —I 54.635205
A4 _ 0.11580094
B5 a 7.3944412 x 10 -6
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Thrrmodynconic Properties of Methylene Chloride 121
properties, the heats of formation and Berthelot's correction for entropy and enthalpy. Using the values of entropy and enthalpy at the boiling point, the constants of integration, Cs and CH were evaluated.
The values of entropy and enthalpy were calculated at various temp& ratures and pressures using Equations 11 and N.
ENTROPY AND ENTHALPY OF SATURATED VAPOUR
As Martin and Hou Equation of State (Equation 4) holds good for the saturated vapour region also, the properties of saturated vapour were calculated in the same manner as in the superheated vapour region.
ENTROPY AND ENTHALPY OF SATURATED LIQUID
The latent heat of vaporization of methylene chloride was calculated
using Equation [31.
The entropy of vaporization A Sy, is related to the heat of vaporization,
by the relation, Allv— TASy 191
The entropies and enthalpies of' saturated liquid were calculated using the
equations,
S i 9= Sg — A Sv [10]
ani Iii =--- 1-18, — A If v (I 1]
The properties of saturated and superheated methylene chloride are presented in Tables I and 11 respectively, and in graphical form as Figure 1.
INTERNAL CONSISTENCY OF THE TABULATED RESULTS
The internal consistency of the results was checked by two methods as
outlined below. (a) Using dH = Td S + Yd P:
The relation , dif s TdS + Vd P may be used
to check the internal consistency of the entropy and enthalpy values.