Applying chemometric procedures for correlation the FTIR spectroscopy with the new thermometric evaluation of Total Acid Number and Total Basic Number in engine oils
Applying chemometric procedures for correlation the FTIR spectroscopy with the new thermometric evaluation of Total Acid Number and Total Basic Number in engine oils
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DOI：
10.1016/j.chemolab.2020.104215
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发表时间：
2021-01-15
影响因子：
3.9
通讯作者：
Tsolakis, Athanasios
中科院分区：
文献类型：
--
作者：
Macian, Vicente;Tormos, Bernardo;Tsolakis, Athanasios
目前，利用光谱技术对废旧机油进行状态评估是主要趋势。这是提高油液状态监测（OCM）效率要求的结果。通常采用傅里叶变换红外光谱技术来实现对废旧机油的测量能力，并利用傅里叶变换红外光谱生成属性-光谱之间的关系。为了实现这种联系，有必要开展化学计量学研究。然而，该过程需要事先验证，以将光谱与标准化技术测量的属性值相关联。研究的一个潜在属性是总酸值（TAN）对发动机油的酸化，特别是采用ASTM D8045标准，通过温度滴定法测量TAN水平。新标准提供了更好的化学路径来准确量化旧机油的TAN值。另一个基本参数是总基值（TBN），它也可以通过测温测定来量化。这两个参数都是相关的，因此本研究的重点是建立一个数学模型，该模型利用其FTIR光谱的形状来描述发动机油的状况。具体地说，在这项工作中，已经证明了化学计量程序与温度滴定法一起用于确定旧机油的TAN和TBN值的适用性。
Currently, the main trend is to employ spectroscopic techniques for the condition assessment of used engine oils. That is a consequence of the requirement for increasing the Oil Condition Monitoring (OCM) efficiency. Usually, FTIR (Fourier Transform Infra-red) Spectroscopy is employed to achieve the ability of measuring used engine oil and uses the FTIR spectrum to generate a relation between attribute-spectrum. To allow this connection, it is necessary to develop chemometric studies. However, this procedure needs a previous validation to correlate the spectrum with the value of the attribute measured by standardised techniques. One of the potential attribute for study is the acidification of the engine oil by the Total Acid Number (TAN), specially employing the ASTM D8045 standard that measures the TAN level by thermometric titration. The new standard offers a better chemical path to quantify accurately the TAN value of used engine oil. And other basic parameter is the Total Basic Number (TBN) that also is possible to quantify by thermometric determinations. Both of these parameters are correlated, therefore this study is focused on the generation of a mathematical model that describes the condition of the engine oil employing the shape of its FTIR spectrum. Specifically, in this work has been shown the applicability of chemometric procedures in conjunction with thermometric titration for determining TAN and TBN values of an used engine oil.