IR spectroscopy for analysing solvent extraction efficiency of oil extracts

Abstract

Solvent extraction is a method for purifying oil extracts, which are used as oil-plasticisers for industrial rubber goods, from cancerogenic hydrocarbons. The efficiency of this method is mainly determined by the selectivity and solvent properties of a separating agent. However, when carrying out a comparative analysis of promising extraction methods, it is necessary to use real-time methods for studying the composition of the resulting products. The purification efficiency of oil extracts from polycyclic aromatic components, including carcinogenic hydrocarbons (benzo[a]pyrene, benzo[e]pyrene, benzo[a]anthracene, chrysene, benzo[b]fluoranthene, etc.), was evaluated depending upon the nature of selective solvents. The structure-group composition of the purified oil extracts and those at the second-stage of purification was determined by FTIR spectroscopy. It was found that the extraction efficiency of the studied solvents towards polycyclic aromatic hydrocarbons from oil extracts increases in the following order: dimethyl sulfoxide < N-methylpyrrolidone + 10 wt% ethylene glycol

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红外光谱法分析油提取物溶剂萃取效率

溶剂萃取是一种从致癌碳氢化合物中提纯油提取物的方法，这些油提取物被用作工业橡胶制品的石油增塑剂。该方法的效率主要取决于分离剂的选择性和溶剂性质。然而，在对有前途的提取方法进行比较分析时，有必要使用实时方法来研究所得产品的成分。根据选择溶剂的性质，对多环芳香族成分(包括致癌烃(苯并[a]芘、苯并[e]芘、苯并[a]蒽、蒽、苯并[b]芴等)的油提取物的净化效率进行了评价。用傅里叶红外光谱法测定了纯化油和第二阶段纯化油的结构-基团组成。结果表明，不同溶剂对油脂提取物中多环芳烃的萃取效率依次为:二甲亚砜< n -甲基吡咯烷酮+ 10 wt%乙二醇< n -甲基吡咯烷酮+50 wt%三甘醇。当使用n -甲基吡咯烷酮+ 50 wt%三甘醇的溶剂时，纯化油提取物中聚烷基取代和缩合芳香结构的比例降低了16.8%;与使用n -甲基吡咯烷酮+乙二醇混合物提取相比，油提取物收率提高了25 wt%以上，符合欧盟对油提取物纯化的要求(指令No. 2005/69/EC)。因此，我们推荐使用n -甲基吡咯烷酮+ 50 wt%三甘醇组成的溶剂来净化对环境和人体健康有技术影响的油提取物成分，并使用红外光谱来评估油提取物溶剂提取的效率。

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