US EPA

8781664 

Journal Article 

Solubility of pyridine-2,6-dicarboxylic acid in supercritical carbon dioxide and its application for removal of lead and nickel in simulated matrices 

Deepitha, J; Pitchaiah, K; Chandrasekhar, G; Sivaraman, N 

2021 

Yes 

Journal of Supercritical Fluids
ISSN: 0896-8446 

Elsevier 

176 

Elsevier 

105318 

English 

10.1016/j.supflu.2021.105318 

WOS:000674452400005 

https://linkinghub.elsevier.com/retrieve/pii/S0896844621001583
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The solubility of pyridine-2,6-dicarboxylic acid in supercritical carbon dioxide was measured at 313-333 K and 10-20 MPa, using a flow-saturation technique. The influence of methanol on solubility behavior is investigated. The solubility in neat supercritical carbon dioxide ranged from 0.44 x 10-6 mol center dot moltot-1 to 3.4 x 10-6 mol center dot moltot-1 ,while its solubility in presence of methanol ranged from 0.17 x 10-5 mol center dot moltot-1 to 18.1 x 10-5 mol center dot moltot-1. The solubility data was modeled with Chrastil, Mendez-Teja, Garlapati equations and Peng-Robinson equation of state model. The solubility in the presence of methanol was correlated using modified Chrastil, modified Mendez-Teja and Thakur models. Among the models employed, Chrastil model (binary system) and modified Mendez-Teja model (ternary system) shown highest accordance with experimental data. Pyridine-2,6-dicarboxylic acid was employed as a chelating agent for development of a supercritical fluid extraction method for removal of Pb2+ and Ni2+ from simulated aqueous/soil matrices. 

Co-solvent; Equation of state model; Semi-empirical equations; Solubility; Supercritical fluid extraction; Pyridine-2; 6-dicarboxylic acid; TOXIC HEAVY-METALS; FLUID EXTRACTION; SOLVENT-EXTRACTION; SOLID MATERIALS; CO2; PLUTONIUM; URANIUM; CYANEX-302; ACTINIDES; PRESSURE