乙酸+异丙醇酯化体系中汽液平衡测定及萃取精馏
Determination of vapor-liquid equilibrium of the acetic acid + isopropanol esterification system and extractive distillation
郭义敏 1邹昀 1张秀钰 1乔颖 1童张法1
作者信息
- 1. 广西大学 化学化工学院,广西石化资源加工及过程强化技术重点实验室,广西 南宁 530004
- 折叠
摘要
汽液平衡数据对于共沸物分离具有十分重要的地位,为了解决乙酸+异丙醇酯化反应体系中的共沸物分离的问题,采用Dvorak-Boublik平衡釜测定了乙酸+异丙醇+乙酸异丙酯、乙酸+异丙醇+水、乙酸+乙酸异丙酯+水、异丙醇+乙酸异丙酯+水 4 个三元体系的汽液平衡数据,对实验数据进行热力学一致性检验和NRTL(nonrandom two-liquid)模型关联.通过残留曲线图分析了共沸体系分离的可行性,利用Aspen Plus对异丙醇+乙酸异丙酯+水体系进行萃取精馏工艺模拟和优化.结果表明,分离得到乙酸异丙酯质量分数≥98%,异丙醇质量分数≥99%,研究结果不仅补充了部分乙酸+异丙醇酯化反应体系的三元汽液平衡数据,也为体系的共沸物分离提供理论依据.
Abstract
Vapor-liquid equilibrium data plays an important role in azeotrope separation.To solve the problem of azeotrope separation in acetic acid + isopropanol esterification reaction system,the vapor-liquid equilibrium data of acetic acid + isopropanol +isopropyl acetate,acetic acid + isopropanol + water,acetic acid + isopropyl acetate + water,and isopropanol + isopropyl acetate + water were determined by Dvorak-Boublik equilibrium kettle.Thermodynamic consistency test and NRTL(nonrandom two-liquid)model correlation were performed on the experimental data.The feasibility of azeotrope separation was analyzed by residue curve.The extractive distillation process of isopropanol + isopropyl acetate + water was simulated and optimized by Aspen Plus.The results show that the mass fraction of isopropyl acetate and isopropanol are≥98%and≥99%,respectively.The results provide the data of ternary vapor-liquid equilibrium of acetic acid + isopropanol esterification reaction system,and show a theoretical basis for azeotrope separation of the system.
关键词
酯化体系/共沸/汽液平衡/残留曲线/萃取精馏Key words
esterification system/azeotrope/vapor-liquid equilibrium/residue curves/extractive distillation引用本文复制引用
基金项目
广西自然科学基金(2017GXNSFDA198047)
广西石化资源加工及过程强化技术重点实验室主任基金(2021Z013)
出版年
2024
国家科技期刊平台
NSTL
万方数据