Determining phenol partition coefficient values in water- and industrial process water-supercritical CO2 systems using direct aqueous SFE apparatus simultaneously interfaced with on-line SFC and on-line HPLC

• Published in: The Journal of supercritical fluids Vol. 152; p. 104558
• Main Authors: Li, Ben, Guo, Wei, Ramsey, Edward D.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2019
• Subjects: Aqueous SFE; Carbon capture and storage; On-line HPLC; On-line SFC; Partition coefficients; On-line SFC; On-line HPLC; Partition coefficients; Carbon capture and storage; Aqueous SFE
• ISSN: 0896-8446; 1872-8162
• DOI: 10.1016/j.supflu.2019.104558

[Display omitted] •Aqueous SFE apparatus interfaced with both on-line SFC and HPLC systems.•Rapid determination of organic compound partition coefficients in aqueous standards.•Method to obtain multiple compound partition coefficients for a single water sample.•Measuring organic compound partition coefficients in complex real world water samples.•Data to assess water pollution caused by carbon capture and storage facilities. Instrument configurations and methods have been developed to rapidly obtain partition coefficient (K) values of organic compounds distributed between SF−CO2 and water. The procedures use a stirred aqueous SFE system interfaced with both on-line SFC and HPLC instruments. Phenol served as model compound. Initial work involved determining phenol K values using pure water standards through temperatures 318 K, 328 K, 338 K and eight pressures from 8.62 MPa to 20.68 MPa. Due to operational requirements of the two different chromatography interfaces, on-line SFC provided more advantages than on-line HPLC to determine K values. The combined instrumentation is ideally suited to determine K data for individual organic compounds present in complex mixtures partitioned between SF−CO2 and various industrial and geological sources of water including those associated with underground carbon dioxide storage facilities. The K values of phenol in steel industry process water containing many other SF−CO2 soluble organic pollutants were determined.