Research on clean oil removal process of regenerated polyester with supercritical CO2
Spinning oil should be added to regenerated polyester when spinning,and the oil will affect the subsequent dyeing process.In order to reduce the influence of oil agents on the subsequent dyeing process,supercritical CO2 fluid extraction method was used to study the oil removal effect of recycled polyester yarn under supercritical system.The oil removal temperature,pressure,time and CO2 flow rate were selected as the research factors,and the process conditions were optimized by response surface method.The results showed that the optimum process conditions are as follows:oil removal temperature 64℃,oil removal pressure 21 MPa,oil removal time 60 min and CO2 flow rate 415 kg/h.Under these conditions,the oil removal rate of regenerated polyester yarn can reach 78%.Scanning electron microscopy and infrared spectroscopy were used to further investigate the properties of the yarn after oil removal.The results showed that the surface oil of the yarn after oil removal by supercritical CO2 was reduced to a certain extent,and the physical structure of the yarn was not affected.
supercritical CO2 fluidresponse surface analysisregenerated polyesteroil removal rate
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