甲基正丁基甲酮萃取煤化工高浓含酚废水实验研究与过程模拟

发布时间：2018-07-11 21:34

  本文选题：煤化工 + 酚氨回收　； 参考：《华南理工大学》2015年硕士论文

【摘要】：劣质煤在400-1000°C处理过程中会产生高浓含酚废水,工业上可行的方法是采用酚氨回收技术对废水中有价值物质回收利用,而后将其送入后续生化处理阶段进一步处理。其中溶剂萃取是酚氨回收的关键环节。本论文针对高浓含酚废水的特点,选择甲基正丁基甲酮(Methyl butyl ketone,MBK)作为萃取脱酚溶剂,并对MBK萃取性能进行了研究。实验结果表明,MBK是一种优异的脱酚萃取剂,对挥发酚和非挥发酚都具有很好的萃取效果。在此基础上,本文探究了MBK最佳萃取脱酚条件,研究了温度、p H值、相比等对脱酚效果的影响,并结合实际工业煤气化废水的特点,确定比较理想的萃取工艺条件:萃取温度T=40-50℃,p H=7.0-8.0,三级错流萃取时,适宜的相比(体积比)是R=1:4-1:5。液液相平衡关系是萃取过程模拟和设计的基础。本论文测定MBK-苯酚-水、MBK-(邻/间/对)甲酚-水、MBK-对苯二酚-水三元体系及MBK-水-苯酚-对苯二酚四元体系的多组液液相平衡数据,并分别用UNIQUAC模型和NRTL模型进行关联,回归得到了各体系的UNIQUAC模型和NRTL模型二元交互作用参数。结果显示两个活度系数模型均能对实验数据进行较好的预测。在液液相平衡研究的基础上,利用实验回归得到的活度系数模型中的二元交互作用参数,结合化工过程模拟技术对MBK萃取处理工业含酚废水过程进行了模拟计算,并对萃取塔、溶剂回收塔和溶剂汽提塔的操作条件进行了模拟优化。结果发现,温度为40℃,相比(质量比)R=1:7.77时,四级逆流萃取可将废水中总酚含量从12700 mg·L-1降低到300 mg·L-1。公用工程计算结果表明,废水处理量为100 t·hr-1时,用MBK萃取比用甲基异丁基甲酮节省冷却水93 t·hr-1,节省中压蒸汽682 kg·hr-1,节省低压蒸汽309 kg·hr-1。模拟计算数据可为MBK萃取脱酚的工业化提供参考。
[Abstract]:The low-quality coal will produce high concentration phenol wastewater during the treatment of 400-1000 掳C. the feasible method in industry is to recycle the valuable substance in the wastewater by using phenol ammonia recovery technology, and then send it to the stage of subsequent biochemical treatment for further treatment. Solvent extraction is the key link of phenol ammonia recovery. In this paper, according to the characteristics of high concentration phenol containing wastewater, methyl butyl ketonebutanone (MBK) was selected as the solvent for extraction of phenol, and the extraction performance of MBK was studied. The experimental results show that MBK is an excellent extractant for both volatile phenol and nonvolatile phenol. On this basis, the optimum extraction conditions of MBK were studied, and the effects of temperature and ratio on the removal of phenol were studied, and the characteristics of industrial coal gasification wastewater were also discussed. The optimum extraction process conditions were determined as follows: extraction temperature Tn40 ~ 50 鈩，

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