摘要
为探索工业含酚废水处理的适宜萃取剂,选用具有物理萃取和络合萃取作用的两类萃取剂正辛醇、甲基异丁基甲酮(MIBK)和磷酸三丁酯(TBP)(以煤油为稀释剂)进行了苯酚稀溶液萃取性能的实验研究。测定了不同溶液pH值、初始苯酚浓度和TBP浓度条件下的萃取平衡数据,分析了各萃取剂萃取平衡的规律及机理。结果表明,虽然各萃取剂的萃取机理不同,但在酸性和中性范围内都可获得较大的萃取平衡分配系数,所以,这三种萃取剂的适宜pH值操作条件为酸性和中性,且在稀溶液的范围内溶剂的萃取能力为TBP > MIBK >正辛醇,而在极稀的苯酚浓度条件下(<20mgL-1),则为正辛醇> TBP > MIBK。同时,正辛醇、TBP处理工业含酚废水的错流萃取实验表明,若考虑通过单一的萃取方法使得废水中苯酚的浓度达到国家排放标准(0.5mgL-1),正辛醇为适宜的萃取剂。
The extraction experiments have been carried out for phenol in its dilute solution with physical extraction solvent, 1-octanol, methyl isobutyl ketone (MIBK) and complexing agent tributyl phosphate (TBP) in kerosene respectively at a wide pH range. The dependences of the extraction equilibrium on the initial phenol concentration and TBP concentration were measured. Results showed that high distribution coefficient for the above solvents could be obtained at solution with pH<8, although the extraction mechanism for each solvent is different. The initial phenol concentration affects the distribution coefficient strongly. The experiments showed that the order of degree of extraction is TBP>MIBK>1-octanol for phenol in its dilute solution, but 1-octanol >TBP>MIBK for phenol in extremely dilute solution (<20mgL-1). The result of cross-flow extraction for industrial effluent with 1-octanol and 30%TBP/kerosene respectively showed that 1-octanol is the suitable solvent for industrial effluent treatment using a single extraction method.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2003年第3期261-265,共5页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金项目(29836130)。
