Modeling of askarel solubility in supercritical CO2 aiming solid residue treatment
Polychlorinated biphenyls (PCB) are chlorinated organic substances which are highly toxic and also con-sidered persistent organic pollutants (POP). It should be emphasized the environmental importance fortreating wastes with PCB. For instance, Stockholm convention on POP established the elimination...
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| Principais autores: | , , , , |
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| Formato: | article |
| Idioma: | English |
| Publicado em: |
Elsevier
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| Assuntos: | |
| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/32535 |
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| Resumo: | Polychlorinated biphenyls (PCB) are chlorinated organic substances which are highly toxic and also con-sidered persistent organic pollutants (POP). It should be emphasized the environmental importance fortreating wastes with PCB. For instance, Stockholm convention on POP established the elimination of theuse of PCB in equipments, e.g., electrical transformers and capacitors, by 2025. The decontamination ofmaterials containing PCB may be performed by supercritical extraction technology using carbon dioxide(CO2) as solvent. The first objective of this work was the formulation of a computational tool to correlatesolubility data of aromatic compounds in supercritical CO2, using Peng–Robinson equation of state. In asecond step, a description of Askarel oil, like Araclor 1254, solubility in supercritical CO2was provided forsimulation purposes of the extraction process. PCB mixture has predominance of congeners: tetra, penta,hexa, heptachloro biphenyl, tri and tetrachlorobenzene. The calculation procedure was initially appliedfor a series of aromatic compounds (naphthalene, biphenyl, anthracene and phenanthrene) in order tovalidate the approach. Experimental solubility data collection has been elaborated from the literature,providing a systematic series of the studied aromatic compounds with CO2. The binary parameters for theclassical van der Waals quadratic mixing rule (vdW2) were systematically estimated, together with a newset of Clausius–Clapeyron solute vapor pressure in order to describe the temperature dependence andachieve experimental solubility uncertainties. Finally, the estimated parameters were used to simulatesolubility values of Askarel oil as function of the operational conditions of extraction by a simultaneoussolution of the equilibrium equations for each compound. The thermodynamic modeling demonstratedto be feasible for process analysis and design |
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