摘要
通过溶剂选择原理粗选出萃取精馏制备甲缩醛产品的溶剂,既而通过Chemcad软件模拟和汽液平衡实验确定合适的溶剂及溶剂比。结果表明,N,N-二甲基甲酰胺(DMF)能够消除甲缩醛-甲醇共沸物系的共沸点;采用UNIQUAC模型对常压下甲缩醛-甲醇物系和加入溶剂N,N-二甲基甲酰胺的汽液平衡进行模拟,模拟结果和实验数据吻合较好。用间歇萃取精馏实验对甲缩醛粗品进行了分离,在实验条件下,可以从塔顶得到质量浓度为99.9%的高纯度甲缩醛产品。
The solvent for methylal production by extractive distillation was chosen according to basic selection rules.The appropriate solvent and solvent ratio were determined with Chemcad simulation and vapor-liquid equilibrium experiment.The results showed that N,N-dimethylformamide（DMF）as a solvent could eliminate the azeotropic point of the azeotrope methylal-methanol.The simulation of vapor-liquid equilibrium using UNIQUAC model for methylal-methanol system with and without DMF under atmospheric pressure were performed and the simulation results agreed well with the experimental data.Finally the separation of crude product of methylal-methanol by batch extractive distillation was performed.Under the operation conditions,the high purity product methyal of 99.9%（mass percentage）could be obtained at the top of the column.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2011年第7期1440-1443,共4页
Chemical Industry and Engineering Progress
关键词
萃取精馏
N
N-二甲基甲酰胺
甲缩醛
甲醇
extractive distillation
N
N-dimethylformamide（DMF）
methylal
methanol
