EG-SCCO2-PET三元体系相平衡.pdf

第45卷第6財
化学
Vol 45 No6
2017年6月
CHEMICAL ENGINEERING(CHINA)
Jun.2017
EG-SCCO2-PET三元体系相平衡
蒋春跃,王秀祥,孙志娟,张玉2
(浙江⊥业大学1.化学工程学院;2.海洋学院,浙江.杭州310014
摘要:利用超临界二代化碳(SCO2)来輔助聚合物系脱挥可有效降低聚个物中拆发物含量,从而有利于改善疑合
物的性能,∏SCO2易与体系分离,可避免传统脱抔方式帯来的回题。SCCO2相平衡的分配参数是研究聚合物分离
体系的?础,用实验方法获得分配系数刈于指导SCCO2来辅助聚个物系脱挥具有重要的意义。文中采用静态法研
究了乙二(FG)-超临界二氧化碳(SCO2)-聚对苯二甲酸乙二醇所(PE-T)三元体系相平衡,并探究了温度和压力
对相平衡的影响。在温度为323.15-363.15K,压力为9-17MPa范内,测得PT样品中FG在SCCO2中的溶解
度为0.392-1.13g/1,并进一步计算得到FRG在SCO2相与PT相间的分配系数为0.0708-0.4197,结果表明在
合逼的温度及高压下,SCCO2可有效脱除PET中的挥分。
关键词:脱挥;静态法;聚对苯二口酸乙二醇帖;相平衡;分配系数
中图分类号:0642.42文献标识码:文章编号:1005-9954(2017)06-0027-05
DO1:10.3969/j.isn.1005-9954.2017.06.006
Phase equilibrium of EG-SCCO, -PET ternary system
IANG Chun-yue, WANG Xiu-xiang, SUN Zhi-juan,, ZHANG Yu
1. College of Chemical Engineering; 2. Ocean College, Zhejiang University of
Technology, Hangzhou 310014, Zhejiang Province, China)
Abstract: Supercritical Carbon Dioxide(SCCO, was used to remove volatile in the process of solid phase
polycondensation, which improved properties of the obtained polymer. Moreover, it was easy Lo separate SCCO
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 CCO2. Thus, it was
very important to obtain the distribution coefficients by experimental method for removing volatile with SCCO in the
process of solid phase polycondensation. Ternary phase equilibrium of ethylene glycol(EG)-supereritical carbon
dioxide(SCCO, ) -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 SCCO, for PET sample is 0.392-1 13 g/L in this system, and the
distribution coefficients of EG between the SCCO, and PET phases calculated is 0.070 7, which indicates
that the volatile in PE T can be removed elleclively al specific temperature and high pressure
Key words: devolatilization; static method; polyethylene terephthalate; phase equilibrium; distribution coefficient
利用超临界二氧化碳(SCCO2)来辅助聚合物系程5。SCO2相平衡的分配参数是研究聚合物分
脱探可有效降低聚合物中挥发物含量,从而有利于离体系的基础,用实验方法获得分配系数对于指导
改善聚合物的性能,且SCCO2易与体系分离,可避免SCCO2来辅助聚合物系脱挥具有重要的意义。
传统脱挥方式带来的问题。相比传统脱挥方法
Condo和Shin”利用反超临界色谱法测定溶
具有较大的优势2,其脱挥时问短、效率高,并能质在聚合物相与SCCO2相间的分配系数:; Kazarian
实现“缩聚、脱挥与单体回收”三位一体工艺过等采用 Fourier变换红外色谱和UV-vis光谱测定溶
收稿日期:201609
基金项目:国家自然科学青牛基金资助项口(21104066);浙江省白然科学基金资助项门(1Y15BO600060)
作者简介:将春跃(1958一),男,博士,教授,研究方向为绿色化T与材料科学,极端环境下的过程技术及其应用,电话:13575730929
E-mail:zjicy@ziu.clu.cn;孙志娟,通信联系人,电话:13968005152,E-mail:sunz]@zu.clu.cn。
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