ON-LINE CONTROL OF A RED AZO DISPERSE DYE: VIS ABSORPTION SPECTROPHOTOMETRY WITH SUPERCRITICAL CARBON DIOXIDE

摘要

Azo disperse dyes should be used in supercritical carbon dioxide for dyeing polyesters fibres. We have focused this study on one pure dye, prepared by CIBA: red SM1P. The solubility measurements for practical applications were carried out in two static stirred high pressure cells : a thermostat high pressure view cell by visual inspection of the phases (P max =75 MPa, T max = 150℃) and an other cell (P max =75 MPa, T max = 250℃ ) equipped with two sapphire windows was used for UV-vis spectrophotometer measurements. Extraction of red SM1P with supercritical carbon dioxide was investigated at 80℃ and 20MPa over a wide range of contact times on a laboratory equipment, modified with on-line UV-visible spectrophotometer detector, at the outlet of the extraction column.