摘要
甲苯液相空气氧化法生产苯甲酸废水的成分复杂 ,属生物难降解体系 ,CODCr值高达 2 0 0 0 0～ 1 0 0 0 0 0mg/L .本研究分别采用磷酸三丁酯、三烷基胺、三烷基氧膦为络合剂 ,正辛醇为助溶剂 ,煤油为稀释剂 ,通过萃取 反萃的方式 ,对苯甲酸废水进行处理 .结果表明 ,多级错流萃取能有效地回收溶质苯甲酸 ,将原废水的CODCr值降低至 1 / 6,使之满足其它末端处理的要求 ,而且反萃工艺简单易行 ,可生产苯甲酸盐 。
The benzoic acid wastewater produced from toluene by liquid\|phase oxidation is one of the difficult wastewater to treat because of multi\|component, high COD\-\{Cr\} value (20 000～100 000mg/L) and nonbiodegradability. A pretreatment way of this wastewater by extraction based on chemical complexation was carried out, and tributyl phosphate (TBP), trialkylamine (7301) and trialkyphosphine oxide (TRPO) were used as complexing agent with n\|octanol, kerosene as cosolvent and diluent respectively. Results showed that benzoic acid was recovery successfully and the COD\-\{Cr\} value of wastewater was reduced to 1/6 of the initial value through multi\|stages cross\|flow extraction. Back\|extraction was quite easy and the solvent could be reused.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2001年第5期79-82,共4页
Environmental Science
基金
国家自然科学基金项目 (2 96 30 10 )
关键词
苯甲酸
络合萃取
磷酸三丁脂
三烷基胺
三烷基氧膦
废水预处理
benzoic acid wastewater
extraction by chemical association
tributyl phosphate
trialkylamine
trialkyphospine oxide
