化学工程2017，Vol.45Issue(6)：27-31,5.DOI:10.3969/j.issn.1005-9954.2017.06.006
EG-SCCO2-PET三元体系相平衡
Phase equilibrium of EG-SCCO2-PET ternary system
摘要
Abstract
Supercritical Carbon Dioxide (SCCO2) was used to remove volatile in the process of solid phase polycondensation, which improved properties of the obtained polymer.Moreover, it was easy to separate SCCO2 from the polymerization system, so some problems caused by traditional separation way could avoid.Distribution coefficients of phase equilibrium was the seperation basis of the polymerization system with SCCO2.Thus, it was very important to obtain the distribution coefficients by experimental method for removing volatile with SCCO2 in the process of solid phase polycondensation.Ternary phase equilibrium of ethylene glycol(EG)-supercritical carbon dioxide(SCCO2)-polyethylene terephthalate(PET) was investigated by the static method.Moreover, the effects of temperature(323.15-363.15 K) and pressure (9-17 MPa) on the phase equilibrium were analyzed in detail.The results show that the solubility of EG in SCCO2 for PET sample is 0.392-1.13 g/L in this system, and the distribution coefficients of EG between the SCCO2 and PET phases calculated is 0.070 8-0.419 7, which indicates that the volatile in PET can be removed effectively at specific temperature and high pressure.关键词
脱挥/静态法/聚对苯二甲酸乙二醇酯/相平衡/分配系数Key words
devolatilization/static method/polyethylene terephthalate/phase equilibrium/distribution coefficient分类
化学化工引用本文复制引用
蒋春跃,王秀祥,孙志娟,张玉..EG-SCCO2-PET三元体系相平衡[J].化学工程,2017,45(6):27-31,5.基金项目
国家自然科学青年基金资助项目(21104066) （21104066）
浙江省自然科学基金资助项目(LY15B060006) （LY15B060006）
