CO_2-1,3-PDO-PTT三元体系相平衡的研究  

Phase equilibrium for CO_2-1,3-PDO-PTT ternary system

作　　者：蒋春跃[1] 宁杰[1] 孙志娟 王秀祥[1] JIANG Chun-yue;NING Ji;SUN Zhi-juan;WANG Xiu-xiang(College of Chemical Engineering;Ocean College,Zhejiang University of Technology,Hangzhou 310014,Zhejiang Province,China)

机构地区：[1]浙江工业大学化学工程学院,浙江杭州310014 [2]浙江工业大学海洋学院,浙江杭州310014

出　　处：《化学工程》2018年第5期33-37,共5页Chemical Engineering(China)

基　　金：国家自然科学青年基金资助项目(21104066);浙江酋自然科学基金资助项目(LYl58060006)

摘　　要：溶质-超临界流体-聚合物三元体系相平衡的研究为超临界流体辅助聚合物脱挥技术提供了热力学基础数据,利用自行研制的一套超临界CO_2高压装置,采用静态法,研究了温度为313.15—353.15 K、压力为7—19 MPa条件下,二氧化碳(CO_2)/1,3-丙二醇(1,3-PDO)/聚对苯二甲酸丙二醇酯(PTT)三元体系相平衡时超临界流体相中的组成。实验测得PTT模拟样品中1,3-PDO在SCCO_2中的溶解度,并计算得到了1,3-PDO在SCCO_2相与PTT相间的分配系数,同时分析了温度和压力对溶解度、分配系数的影响。在上述条件下,1,3-PDO的溶解度为0.262—3.597g/L,分配系数为0.020 5—0.076 2。研究结果显示:当温度一定时,溶解度随压力的增大呈现增大的趋势;溶解度随温度的变化会存在一转变压力(约18 MPa),在转变压两侧,溶解度会呈现相反的变化趋势;分配系数等温线随压力的增大呈现倒U型,即先增大后减小。Abstract ：The objective of the researeh was to provide fundamental thermodynamics data for the development of supercritical fluid assisted polymer devolatilization technology. The equilibrium composition data in a COil, 3- Propanediol（1,3-PDO）/Poly （trimethylene terephthalate）（PTT） ternary system was determined by a high pressureapparatus based on a static method. The solubility of 1,3-PDO in SCCO2 and distribution coefficient of 1,3-PDO between the polymer and the supereritical fluid were also determined experimentally at 313.15 K to 353.15 K over the pressure range of 7 MPa to 19 MPa. Moreover, the effects of temperatre and pressure were investigated in a detail. The results show that the solubility is 0.262-3. 597 g/L, and the distribution coefficient is 0.020 5-0. 076 2. The solubility increases with increasing pressure at a constant temperatre. The change of solubility with temperatm~ is complex, and there is a cross over pressure point（about 18 MPa）. On either side of the pressure, the solubility shows the opposite trend. The distribution coefficient isothemls are inverted U shape with increasing pressure, and it means all of them increase first and then decrease.

关 键 词：脱挥 超临界二氧化碳 三元相平衡 分配系数 聚对苯二甲酸丙二醇酯 

分 类 号：O642.42[理学—物理化学]