高盐含酚工业废水的脱酚工艺研究与优化
Study and optimization of dephenolization process for industrial wastewater containing high concentration salt and phenol
张潆心 1蒋文伟 1焦高成 2彭小双 1曾鸿锟1
作者信息
- 1. 四川大学化学工程学院,四川 成都 610207
- 2. 昊华宇航化工有限责任公司,河南 焦作 454002
- 折叠
摘要
研究了磷酸三丁酯(TBP)-煤油体系在对硝基苯酚(PNP)工业废水中的萃取工艺,TBP与PNP主要形成 1∶1型的络合物,萃取过程的ΔH=-28.21 kJ/mol,废水中盐的存在对络合萃取有正向影响.采用单因素实验法考察了萃取剂浓度、搅拌转速、有机相/水相的体积比(O/A)对脱酚率以及化学需氧量(COD)去除率的影响.根据单因素实验结果,设计三因素三水平Box-Behnken模型进行响应面优化实验.实验结果表明,响应面优化后的最优工艺条件为:TBP 浓度为 28%,搅拌转速为 187 r/min,相比为 0.6,该条件下脱酚率为99.97%,单级萃取后萃余水相酚含量为0.12 mg/L.
Abstract
The extraction process for p-nitrophenol(PNP)industrial wastewater by tributyl phosphate(TBP)-kerosene system is studied.TBP and PNP mainly forms a 1∶1 complex,the extraction process ΔH=-28.21 kJ·mol-1,and the presence of salt in wastewater has a positive effect on the complex extraction.The impacts of extractant concentration,stirring speed,and organic phase/water phase volume ratio(O/A)on the removal rates of phenol and chemical oxygen demand(COD)are investigated by using single factor experiment.According to the results from single factor experiment,a three-factor three-level Box-Behnken model is designed for response surface optimization experiment.Experimental results show that the optimal process conditions after the response surface optimization are as follows:the concentration of TBP is 28%,the stirring speed is 187 r·min-1,and O/A is 0.6.Under these conditions,the removal rate of phenol is 99.97%,and phenol content in the raffinate water phase after single stage extraction is 0.12 mg·L-1.
关键词
磷酸三丁酯/对硝基苯酚/响应面/含酚废水Key words
tributyl phosphate/p-nitrophenol/response surface/phenol-containing wastewater引用本文复制引用
出版年
2024
NETL
NSTL
万方数据