甲基丙烯酸甲酯-甲醇-水共沸体系萃取分离工艺模拟

Simulation of extractive separation process of methyl methacrylate-methanol-H2O azeotropic system

针对甲基丙烯酸甲酯-甲醇-水共沸体系,分别选择水、正己烷和水-正己烷双溶剂为萃取剂建立分离流程进行模拟,建立单溶剂、双溶剂萃取工艺过程进行全流程模拟,采用灵敏度分析优化工艺过程的溶剂比和操作温度.结果表明,双溶剂萃取工艺比水、正己烷单溶剂萃取工艺能耗分别降低15.1%和34.9%.采用绿色度评价方法量化3种分离工艺对环境的影响,水、正己烷、水-正己烷双溶剂萃取工艺的绿色度分别为-7.25,-21.3和-6.75gd.

As one of the important oxygen-containing chemicals,methyl methacrylate (MMA)is widely used in producing organic glass (PMMA), coatings,ACR/MBS and so on.The triple azeotropic systems of MMA-methanol-water are formed in the production process,which resulting in difficulty in product purification.In order to solve the problem on separation of MAA-methanol-water azeotropic system,the separation processes of using a single solvent (water or n-hexane)and bi-solvent (a combination of water and n-hexane)as the extractants were established in this study.The models of extraction processes for single solvent and bi-solvent system were simulated.The ratio of solvent and operating temperature were analyzed and systematically optimized using sensitivity analysis method.It demonstrated that the extraction process using bi-solvent had relatively lower energy consumption compared to those of the single ones,and the energy consumption was reduced by 15.0%(vs.n-hexane) and 34.9%(vs.water),respectively.Meanwhile,the influence of three extraction processes on the environmental impact assessment was quantitatively analyzed using green degree analysis method.The results suggested that bi-solvent process was much more environmental friendly.The green degree of separation process using water, n-hexane and bi-solvent as extractant was -7.25,-21.3 and -6.75gd,respectively.