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目的:采用对二甲苯为萃取剂,通过非分散相溶剂萃取(膜基萃取)同时回收利用精对苯二甲酸(PTA)工业废水中的对甲基苯甲酸和水。创新点:1.采用非分散相溶剂萃取有效地实现了工业条件下PTA废水的净化和资源的回收利用;2.采用数学模拟优化工业萃取的操作参数。方法:1.进行对二甲苯萃取实验,考察操作条件对萃取效率和萃余水杂质浓度的影响;2.通过数学模拟,建立膜萃取过程的数学模型,对操作参数与膜结构参数进行敏感性分析。结论:1.非分散相溶剂萃取可以有效解决PTA工业废水的回收利用问题;2.质量传递的速率控制步骤是管程中的水相扩散;3.优化的工业操作条件为:中空纤维膜内径为200~250μm,萃取时间为50~60 s,水油两相体积比为9.0,萃取温度为318K。
OBJECTIVE: To use p-xylene as extractant and extract p-methylbenzoic acid and water from PTA industrial wastewater by non-dispersive phase solvent extraction (membrane-based extraction). Innovative points: 1. The use of non-dispersive phase solvent extraction effectively under the industrial conditions of PTA wastewater purification and resource recovery and utilization; 2 using mathematical simulation to optimize the operating parameters of industrial extraction. The effects of operating conditions on the extraction efficiency and the impurity concentration of raffinate were studied.2. Through the mathematical simulation, the mathematical model of membrane extraction process was established, and the sensitivity of the operating parameters and membrane structure parameters analysis. Non-dispersive phase solvent extraction can effectively solve the problem of PTA industrial wastewater recycling; 2. Mass transfer rate control step is the water phase diffusion in the pipe; 3. Optimized industrial operating conditions are: hollow fiber membrane inner diameter Is 200 ~ 250μm, the extraction time is 50 ~ 60s, the volume ratio of water to oil is 9.0, the extraction temperature is 318K.