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A new model and estimation of thermodynamic parameters for the solubility of azobenzene and anthraquinone derivatives in supercritical carbon dioxide

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Abstract

Proper measurement and correlation/prediction of solubility data of dye compounds (azobenzene and anthraquinone derivatives) in supercritical carbon dioxide (ScCO2) are essential in the development supercritical dyeing technology. Ample data are available for several dye compounds in the literature, but models that are satisfactorily correlating/predicting solubility data are rare. Therefore, in this study, a simple model is developed for the solubility (\(y_{2}\)) in terms of reduced temperature (\(T_{{\text{r}}}\)) and reduced density (\(\rho_{{\text{r}}}\)) to correlate industrially important dye compounds solubility in ScCO2. The proposed model is \( y_{2} = A + \left( {B + C\rho_{{\text{r}}} } \right)T_{{\text{r}}} + \left( {D + E\rho_{{\text{r}}} } \right)\rho_{{\text{r}}} T_{{\text{r}}}^{2} + F\rho_{{\text{r}}}^{2 } T_{{\text{r}}}^{3}\). The performance ability of the new model is compared with number of existing literature solubility models in terms of various statistical parameters of (AARD, R2, Adj. R2, SSE, and RMSE) as well as Akaike’s Information Criterion (AIC). Moreover, thermodynamic parameters such as sublimation pressure (\(P_{{{\text{sub}}}}\)), sublimation enthalpy (\(\Delta H_{{{\text{sub}}}}\)) and enthalpy of solvation (\(\Delta H_{{{\text{sol}}}}\)) were estimated for anthraquinone and azobenzene derivatives. It was found the proposed model is correlating better than existing models.

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Abbreviations

A − F :

Constants of the proposed model

a 0 − s 9 :

Correlation parameters of semiempirical models

AARD:

The overall average absolute relative deviation

Adj. R 2 :

Adjusted R2

AIC:

Akaike’s Information Criterion

\(b_{ij}\) :

The mixing rules of binary interaction parameters

E :

Enhancement factor

\(H_{{{\text{sol}}}}\) :

Solvation heat

\(H_{{{\text{sub}}}}\) :

Vaporization heat

\(H_{{{\text{tot}}}}\) :

Total reaction heat

K :

Number of parameters

\(k_{ij}\) :

The mixing rules of binary interaction parameters

M w :

The molecular weight

\(N\) :

The number of experimental data

P :

The system pressure

\(P_{i}^{{\text{s}}}\) :

Sublimation of the pure solid

\(P_{{{\text{ref}}}}\) :

The reference pressure (0.1 MPa)

PR:

Peng –Robinson

\(P_{{{\text{sub}}}}\) :

Sublimation pressures

\(P_{{\text{r}}}\) :

Reduced pressure

\(P_{{\text{c}}}\) :

The critical pressure

Q :

Objective function

R :

Universal gas constant

EOS:

Equation of state

\(R^{2}\) :

Correlation coefficient

\({\text{RMSE}}\) :

Root-mean-square deviation

\({\text{SSE}}\) :

Sum of squares error

S :

The solute solubility in kg/m3

T :

Temperature

\(T_{{\text{c}}}\) :

The critical temperature

\(T_{{\text{r}}}\) :

Reduced temperature

VDW2:

Two adjustable parameters of van der Waals mixing rule

\(y_{2}\) :

Mole fraction

\(\Delta\) :

Difference

\(\phi_{i}^{{\text{s}}}\) :

Fugacity coefficient of the pure substance at saturation

\(\phi_{i}^{{{\text{scCO}}_{2} }}\) :

Solute fugacity in supercritical carbon dioxide (scCO2)

\(\omega\) :

Acentric factor

\( \alpha ,\beta ,\gamma \) :

Vapor pressure expression constants

\(\rho\) :

Density

\(\rho_{{{\text{ref}}}}\) :

Reference density

\(\rho_{{{\text{ScCO}}_{2} }}\) :

Density of ScCO2

exp:

Experimental

cal:

Calculated

2:

Solute

1:

ScCO2

i , j :

Component

sub:

Sublimation

c:

Critical

s:

Solute

r:

Reduced

w:

Weights graph

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Acknowledgements

This work was supported by Directorate of Research and Community Services, Directorate General of Strengthening Research and Development, Ministry of Research Technology and Higher Education, Republic Indonesia.

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Correspondence to Ratna Surya Alwi or Chandrasekhar Garlapati.

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Alwi, R.S., Garlapati, C. A new model and estimation of thermodynamic parameters for the solubility of azobenzene and anthraquinone derivatives in supercritical carbon dioxide. Chem. Pap. 75, 4589–4610 (2021). https://doi.org/10.1007/s11696-021-01688-7

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  • DOI: https://doi.org/10.1007/s11696-021-01688-7

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