On-line supercritical fluid extraction / Fourier transform infrared spectrometry was applied to a complex polyester fiber finishing system consisting of seven components. Off-line extractions of these components with 100% CO2 revealed that they ranged in extractability from 25-100%. Due to certain analyte solubility limitations, intermediate trapping was used for quantitative recovery of the finish for subsequent on-line infrared analysis. Ultimately, a calibration curve was developed from finish standards. The percent finish on yarn was calculated using the SFE method and compared with that from conventional solvent extraction.
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