Solubility of CO2 in molten poly(ethylene terephthalate)

doi:10.3969/j.issn.0438-1157.2013.05.002

CIESC Journal ›› 2013, Vol. 64 ›› Issue (5): 1513-1519.DOI: 10.3969/j.issn.0438-1157.2013.05.002

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Solubility of CO₂ in molten poly(ethylene terephthalate)

ZHONG Hua, SUN Shaojun, XI Zhenhao, LIU Tao, ZHAO Ling

State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

Received:2012-08-22 Revised:2012-09-28 Online:2013-05-05 Published:2013-05-05
Supported by:
supported by the National Natural Science Foundation of China (21176070),the High-tech Research and Development Program of China (2012AA040211)and the Fundamental Research Funds for the Central Universities.

CO₂在PET熔体中的溶解度

仲华, 孙少俊, 奚桢浩, 刘涛, 赵玲

华东理工大学化学工程联合国家重点实验室, 上海200237

通讯作者: 赵玲
作者简介:仲华(1984-),男,博士研究生。
基金资助:
国家自然科学基金项目(21176070);国家高技术研究发展计划项目(2012AA040211);中央高校基本科研业务费专项资金。

Abstract

Abstract: The solubility of CO₂ in poly(ethylene terephthalate)(PET) was studied using magnetic suspension balance (MSB) combined with high-temperature high-pressure view cell.The former gives apparent solubility and the latter presents swelling volume through direct observation in the presence of CO₂,which is necessary to correct the gas buoyancy acting on PET melts in the MSB measurement.The effects of temperature and pressure on the swelling ratio and CO₂ solubility in traditional and modified PET melt were analyzed.The results show that both swelling ratio of PET and solubility of CO₂ decrease as temperature increases and increase with pressure.However,the swelling ratio increases slowly and approaches a plateau region under higher pressure.Compared with traditional linear PET,the modified PET displays lower swelling ratio and solubility.Solubility of CO₂ in PET melt is in an order of magnitude of 10^-2 g CO₂·(g PET melt)^-1 under 4-6 MPa in the temperature range of 250-280℃.CO₂ solubility in PET melt agrees well with Henry’s law in the pressure range of 1-6 MPa.Heat of solution is obtained using the least-square method.

Key words: poly(ethylene terephthalate), carbon dioxide, swelling ratio, solubility

摘要： 通过高温高压磁悬浮天平(MSB)测定表观溶解度、高温高压视窗釜进行溶胀度校正的方法研究了CO₂在PET熔体中的溶解度,考察了温度、压力对改性前后PET在CO₂环境中的溶胀度和CO₂溶解度的影响。结果表明,PET在CO₂环境中的溶胀度和CO₂溶解度均随温度的增加而减小,随压力增加而增加,但高压下溶胀度的增加趋势减缓并趋于某定值;与常规线性PET相比,改性PET具有较小的溶胀度和溶解度。在250~280℃,4~6 MPa下,CO₂在PET熔体中的溶解度具有10^-2 g CO₂·(g PET melt)^-1的量级。1~6 MPa下CO₂在PET熔体中的溶解行为符合亨利定律,利用最小二乘法拟合得到了CO₂在PET熔体中的溶解热。

关键词: 聚对苯二甲酸乙二醇酯, 二氧化碳, 溶胀度, 溶解度

CLC Number:

TQ013.1

ZHONG Hua, SUN Shaojun, XI Zhenhao, LIU Tao, ZHAO Ling. Solubility of CO₂ in molten poly(ethylene terephthalate)[J]. CIESC Journal, 2013, 64(5): 1513-1519.

仲华, 孙少俊, 奚桢浩, 刘涛, 赵玲. CO₂在PET熔体中的溶解度[J]. 化工学报, 2013, 64(5): 1513-1519.

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Solubility of CO₂ in molten poly(ethylene terephthalate)

CO₂在PET熔体中的溶解度

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