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›› 2012, Vol. 12 ›› Issue (4): 569-575.

• 反应与分离 • 上一篇    下一篇

伯胺N1923络合萃取苯酚

杨得岭 宁朋歌 曹宏斌 张懿   

  1. 天津大学 化工学院 中国科学院过程工程研究所 中国科学院过程工程研究所 中国科学院过程工程研究所
  • 收稿日期:2012-05-18 修回日期:2012-05-28 出版日期:2012-08-20 发布日期:2012-08-20
  • 通讯作者: 杨得岭

Extraction of Phenol with Primary Amine N1923

YANG De-ling NING Peng-ge CAO Hong-bin WANG Shao-na   

  1. School of Chemical Engineering and Technology,Tianjin University Institute of Process Engineering,Chinese Academy of Sciences Institute of Processing Engineering ,CAS Institute of Process Engineering, Chinese Academy of Sciences
  • Received:2012-05-18 Revised:2012-05-28 Online:2012-08-20 Published:2012-08-20
  • Contact: YANG De-ling

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%(j) N1923的甲苯溶液萃取苯酚效果最好. 平衡水相pH<8.3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(NH4)2SO4>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%(j) N1923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(0.53 mg/L)接近国家污水综合排放标准(0.5 mg/L).

关键词: 络合萃取, 盐效应, 伯胺N1923, 苯酚

Abstract: 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%(j) 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 pHeq<8.3. However, a great impact of the salts on D was observed, the order was (NH4)2SO4>NaCl>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 DrHmQ, Gibbs free energy DrGmQ and entropy change DrSmQ 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).

Key words: complexometric extraction, salt effect, primary amine N1923, phenol

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