Toxic chemical release is the major issue of concern of the industrial effluents. Hence, recovery of chemicals from effluent stream is of great research interest. Present investigation was focused on recovery of pyridine-2-carboxylic acid (picolinic acid) from aqueous streams by reactive extraction using corn oil as a non-toxic diluent. Attempts have been made to estimate the recovery of picolinic acid by chemical extraction and to investigate its kinetic parameters. The kinetic modeling was also carried out for chemical extraction by the law of mass action. Extraction equilibria had been reported and effect of acid concentration, agitation speed and extractant-diluent composition were studied at room temperature. Kinetic study reveals very slow, first order reaction in acid concentration and zero order in extractant, tri-butyl phosphate. The reaction rate constant of 0.191 s⁻¹ suggests a slow type of reaction. The diffusivity of picolinic acid in corn oil was found to be 7.0170 × 10^–11 m² s⁻¹. Although the distribution coefficient is very low and reaction is infinitely slow, the non-toxicity of corn oil used in this study is the key parameter for its use as diluent.

有毒化学物质的释放是工业废水关注的主要问题。因此，从废水流中回收化学品具有很大的研究兴趣。目前的研究重点是使用玉米油作为无毒稀释剂通过反应萃取从水流中回收吡啶-2-羧酸（吡啶甲酸）。已尝试通过化学萃取来估计吡啶甲酸的回收率并研究其动力学参数。还根据质量作用定律对化学萃取进行了动力学建模。已经报道了萃取平衡，并在室温下研究了酸浓度、搅拌速度和萃取剂-稀释剂组成的影响。动力学研究表明，酸浓度下发生非常缓慢的一级反应，萃取剂磷酸三丁酯发生零级反应。^{0.191 s -1}的反应速率常数表明反应是缓慢类型的。吡啶甲酸在玉米油中的扩散系数为7.0170 × 10 ^–11 m ²  s ^-1。尽管分配系数非常低并且反应无限慢，但本研究中使用的玉米油的无毒性是其用作稀释剂的关键参数。