固定床气化废水酚回收技术的现状及发展

基于固定床气化废水的3种物理萃取脱酚技术存在的问题,提出了新型萃取脱酚技术——络合萃取脱酚,研究了不同络合萃取剂的脱酚效果及溶剂回收效果,分析了2种萃取技术的脱酚效果及经济成本。研究结果表明:物理萃取剂对多元酚的萃取率普遍低于80%,而络合萃取剂对多元酚的萃取效果均大于85%,络合萃取剂在水中的损失率(0.1%)普遍低于物理萃取剂(0.87%),络合萃取剂的回收采用碱洗方式,同时络合萃取技术的经济成本(20元/t)低于物理萃取的经济成本(30~40元/t)。

Status and development of phenol removal technologies of fixed bed gasification waste water

In order to solve problems of three physical extraction phenol removal technologies in treating fixed bed gasification waste water,a complex extraction method of complex extraction dephenolizaion was proposed.The effects of extraction and solvent recovery of different complex extraction agents were studied and the effects of two kinds of extraction technologies on the removal of phenol and economic cost were analyzed.The results showed that the extraction rate of the physical extraction was generally lower than 80％,while the extraction rate of the complex extraction agent was higher than 85 ％.The loss rate of complex extraction agent (＜0.1％) in the water was lower than that of physical agent (＞0.87％).The complex extraction was carried out by alkali washing method.The economic cost of complex extraction (＜RMB 20 per ton) was lower than that of physical extraction (RMB 30-40 per ton).