Extracting and Quantifying a Polyester Fiber Finish Using On-line SFE/FT-IR with Intermediate Trapping

摘要

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% CO_2 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.