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A new semi empirical model for the solubility of dyestuffs in supercritical carbon dioxide

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Abstract

Solubility determination and prediction of azobenzene and anthraquinone derivatives in supercritical carbon dioxide (ScCO2) is a challenging and tedious task. Therefore, proper prediction of these solutes are quite important for application of ScCOtechnologies to dyeing industries. In this work, a new semi-empirical model is developed to correlate industrially important dye compounds solubility in ScCO2. The proposed model successfully correlated solute solubility of 22 industrial dye compounds in supercritical carbon dioxide (ScCO2). The correlating ability of the new model is compared with 16 existing literature solubility models in terms of various statistical parameters (AARD, R2, adj. R2, SSE, and RMSE). Furthermore, Akaike’s information criterion was employed to evaluate the relative goodness of the model. We found that the proposed model is correlating better than existing models considered.

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Abbreviations

AARD (–):

Average absolute relative deviation

Adj. R 2 (–):

Adjusted R2

SSE (–):

Sum of squares due to error

RMSE (–):

Root mean square error

N i (–):

Number of data points

Q (–):

Number of independent variables in each model

R 2 (–):

Square of correlation coefficient

S (kg m−3):

Solubility of compound

T (K):

Temperature

y (–):

Solubility of solute in mole fraction

P (MPa):

The system pressure

A0-M9 (–):

Parameter constants

V s (–):

Molar volume

ρ (kg m−3):

Density

\(\emptyset\) (–):

Fugacity coefficient

2:

Solute

c:

At critical point

cal:

Calculated in mole fraction

exp:

Experimental mole fraction

r:

Reduced

ref:

Reference

scCO2 :

Supercritical CO2

SCF:

Supercritical fluid

AIC:

Akaike’s information criterion

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Acknowledgements

This work was partially supported by the Directorate of Higher Education of the project on “Fundamental Research of DRPM DIKTI”.

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Correspondence to Ratna Surya Alwi.

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Alwi, R.S., Garlapati, C. A new semi empirical model for the solubility of dyestuffs in supercritical carbon dioxide. Chem. Pap. 75, 2585–2595 (2021). https://doi.org/10.1007/s11696-020-01482-x

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  • DOI: https://doi.org/10.1007/s11696-020-01482-x

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