伯胺N_(1923)络合萃取苯酚  

Extraction of Phenol with Primary Amine N_(1923)

作　　者：杨得岭[1,2] 宁朋歌[2] 曹宏斌[2] 张懿[2] 

机构地区：[1]天津大学化工学院,天津300072 [2]中国科学院过程工程研究所,北京100190

出　　处：《过程工程学报》2012年第4期569-575,共7页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:51178446);国家高技术研究发展计划(863)基金资助项目(编号:2009AA06Z314)

摘　　要：以伯胺N1923与磺化煤油、石油醚、甲苯或正辛醇为稀释剂组成络合萃取剂,在25℃下对苯酚模拟废水进行萃取.结果表明,40%(φ)N1923的甲苯溶液萃取苯酚效果最好.平衡水相pH8.3时对萃取影响不明显,苯酚以分子形式被伯胺N1923萃取,H+不参与络合反应;无机盐的盐析效应对苯酚萃取影响较大,顺序为(NH_4)_2SO_4>NaCl>NH4Cl.伯胺N1923与苯酚主要生成1:1型萃合物;该萃取过程放热,升高温度不利于萃取.反萃后的有机相萃取效果逐渐下降,可能是伯胺溶解造成的.40%(φ)N_1923的甲苯溶液错流萃取煤气化废水,挥发酚的一级萃取率超过99.0%,三级错流萃取结果(0.53mg/L)接近国家污水综合排放标准(0.5mg/L).The extraction of phenol by primary amine N1923 in various diluents（sulfonated kerosene,petroleum ether,toluene or n-octanol） were studied at 25℃.As a result,40%（φ） amine N1923 diluted in toluene was more efficient than other systems.With this selected extractant,the effects of initial concentration of phenol,equilibrium pH value（pHeq）,temperature and salting-out agent on the equilibrium distribution coefficient（D） were examined.The results showed that pHeq had little effect on D at pH eqNaCl〉NH4Cl. The ratio of N1923 to phenol in the extracted complex was considered as 1：1 using the slope method.Moreover,Extraction equilibrium constant,reaction enthalpy ■,Gibbs free energy ■ and entropy change ■ were calculated.The solvent recycle experiments showed that the extraction yield of phenol was reduced gradually,which was due to the solubility of anmine N1923 in water.Multistage cross-current extraction simulation of industrial gasification wastewater was carried out using the selected system.Over 99% of phenol was removed after one stage extraction and the concentration of phenol in raffinate of three-stage extraction was close to the wastewater discharge standard of China（GB 8978-1996）.

关 键 词：伯胺N1923 苯酚 络合萃取 盐效应 

分 类 号：TQ028.32[化学工程]