化工学报2016，Vol.67Issue(9)：3545-3551,7.DOI:10.11949/j.issn.0438-1157.20160391
聚甲氧基二甲醚+水+正己烷三元体系的液液相平衡
Liquid-liquid equilibria for ternary systems polyoxymethylene dimethyl ethers + water +n-hexane
庄志海 1张建强 1刘殿华1
作者信息
- 1. 华东理工大学化学工程联合国家重点实验室，上海 200237
- 折叠
摘要
Abstract
Polyoxymethylene dimethyl ethers (PODEn) are promising diesel additive which can be synthesized from aqueous formaldehyde solutions and methanol. Formaldehyde+methanolhas been found as an economical and feasible way for the production of PODEn due to the cheap raw materials. In this study the extraction process is chosen to obtain PODEnfrom aqueous solution. A reliable thermodynamic model for a good system description is important for extraction equipment modeling, development and design. Liquid-liquid equilibria(LLE) data are valuable in studies of the applicability of thermodynamic model. In this work, LLE was analytically determined at 293.15 K for the following four systems: (PODE1 + water +n-hexane), (PODE2+ water +n-hexane), (PODE3 + water +n-hexane) and (PODE4 + water +n-hexane), respectively. Based on high selectivity of PODE1-4 over water and the PODEn mass fraction in the organic phase was much larger than that in aqueous phase, it was found that washing withn-hexane was an effective way of extracting PODEn from the aqueous phase without losing any significant amount of PODEn to the extract phase. The isothermal experimental data were shown a good linear fit in Hand plots withR2 being approximately unity. The well-known NRTL and UNIQUAC thermodynamic models were applied to correlate the experimental data, and the results of root mean square deviation calculation (RMSD) and ternary phase diagram analysis indicated that NRTL and UNIQUAC models all shown good predictive capabilities.关键词
萃取/正己烷/聚甲氧基二甲醚/水溶液/相平衡Key words
extraction/n-hexane/polyoxymethylene dimethyl ether/aqueous solution/phase equilibria分类
化学化工引用本文复制引用
庄志海,张建强,刘殿华..聚甲氧基二甲醚+水+正己烷三元体系的液液相平衡[J].化工学报,2016,67(9):3545-3551,7.
