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首页> 外文期刊>Separation and Purification Technology >Recovery of dinitrotoluenes and trinitrotoluene from spent acid of toluene nitration process by solvent extraction
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Recovery of dinitrotoluenes and trinitrotoluene from spent acid of toluene nitration process by solvent extraction

机译：溶剂萃取法从甲苯硝化过程的废酸中回收二硝基甲苯和三硝基甲苯

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Extraction using hexane or heptane solvent was employed to recover dinitrotoluene (DNT) isomers and 2,4,6-trinitrotoluene (TNT) from spent acid after toluene nitration process.Multiple stages experiments were conducted to elucidate the influence of various operating variables on the performance of removal of organic compounds from spent acid,including extracting temperature,volume ratio of solvent versus acid,spent sulfuric acid concentration and organic compounds content of the feedstock.It was found that organic compounds extracted reached nearly 78%,of which solubility in spent acid depends strongly upon the sulfuric acid concentration.In both cases of hexane and heptane,the extracting priority of organic compounds is in the following order:2,3-DNT > 2,6-DNT > 3,4-DNT > 2,4-DNT > 2,4,6-TNT.Furthermore,this method established is promising for regeneration of spent acid preliminarily.
机译：采用己烷或庚烷萃取法，从甲苯硝化后的废酸中回收二硝基甲苯（DNT）异构体和2,4,6-三硝基甲苯（TNT），并进行了多阶段实验以阐明各种操作变量对性能的影响从废酸中去除有机化合物的方法，包括萃取温度，溶剂与酸的体积比，废硫酸浓度和原料中有机化合物的含量。发现提取的有机化合物达到近78％，其中在废酸中的溶解度在己烷和庚烷中，有机化合物的提取优先顺序依次为：2,3-DNT> 2,6-DNT> 3,4-DNT> 2,4- DNT> 2,4,6-TNT。此外，建立的该方法有望初步用于废酸的再生。

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