Abstract

Hydrophilic deep eutectic solvents are actively positioned as efficient extractants for removing heterocyclic compounds from light hydrocarbon fractions. Of particular interest is the subclass of natural deep eutectic solvents (NaDESs), since they contain substances of exclusively natural origin. However, these processes have not been systematically studied to date in extraction equipment. To study the process of countercurrent extraction of pyridine, quinoline, and indole from a model solution of light hydrocarbon fractions using commercial equipment, a series of NaDESs based on citric and malic acids, xylitol, and water was used for the first time in this work. The high extraction capacity of these NaDES was demonstrated in laboratory experiments, and the extraction mechanism was determined. A detailed study of the efficiency of extraction of heterocycles with varying process conditions allowed us to move on to studying the process using extractors of the mixer–settler type. From the model solution of light hydrocarbon fractions, pyridine, quinoline, and indole were removed to concentrations <1 ppm by countercurrent extraction using a cascade of six mixer–settlers.

中文翻译：

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使用商业萃取设备用天然低共熔溶剂对轻质烃馏分进行脱氮

摘要

亲水性低共熔溶剂被积极定位为有效萃取剂，用于从轻质烃馏分中去除杂环化合物。特别令人感兴趣的是天然低共熔溶剂 (NaDES) 的子类，因为它们含有完全天然来源的物质。然而，迄今为止，这些过程尚未在提取设备中进行系统研究。为了研究使用商业设备从轻质烃馏分模型溶液中逆流萃取吡啶、喹啉和吲哚的过程，在这项工作中首次使用了一系列基于柠檬酸、苹果酸、木糖醇和水的NaDES 。实验室实验证明了这些 NaDES 的高萃取能力，并确定了萃取机理。对不同工艺条件下杂环化合物萃取效率的详细研究使我们能够继续研究使用混合沉降器类型萃取器的工艺。使用六个混合沉降器级联进行逆流萃取，从轻质烃馏分的模型溶液中将吡啶、喹啉和吲哚去除至浓度 <1 ppm。