用红外光谱法测定环烷酸纯度的研究

环烷酸是一类带有碳环结构的一元羧酸，是以各种不同分子量的一元羧酸的混合物存在于石油中．将石油各馏分精炼过程的碱洗废液，经过酸处理，就制得工业环烷酸．工业环烷酸中环烷酸含量是环烷酸最重要的一个理化指标，在红外光谱上，环烷酸的羧基在1700cm^-1附近有一极强的特征吸收峰，并且吸收不受样品中其它组分的干扰．因此，红外光谱是快速准确测定工业环烷酸中环烷酸含量较为理想的方法．

The Method of Determination of NaphthenatePurity by Infrared Spectrometry

Naphthenate is a kind of monocarboxylic acid with carbon ring structure,and,it consists in crude oil as monocarboxylic acid that has different molecular weight.The caustic-treated effluent from the cut fraction in the crude oil is treated by acid,then,industrial naphthenate is prepared.The purity of naphthenate in the industrial naphthenate is a most important standard used to estimate the property of naphthenate.In the graph by infrared spectrometry determination method,the carboxyl exists in the 1 700 cm-1 with significant high peak.That exclusive peak won't be interfered with the other groups in the sample.Therefore,the infrared spectrometry method is perfect to determine the purity of naphthenate in industrial naphthenate.