红外光谱法测定柠檬酸壬基酚聚氧乙烯醚单酯二乙醇酰胺的含量

以柠檬酸、乙酸酐、壬基酚聚氧乙烯醚和二乙醇胺为原料，经过原料精制、中间体和产物的合成等一系列过程，得到了一种具有防锈、润滑双重性能的水基合成切削液新型添加剂-柠檬酸壬基酚聚氧乙烯醚单酯二乙醇酰胺。采用红外光谱法对合成样品中酰胺进行定量分析，利用谱图中1 642.39 cm-1处酰胺中CO双键伸缩振动的特征吸收峰，选择硫氰酸钾作为内标物，以朗伯-比尔定律为理论依据，从而建立了直接红外光谱法测定柠檬酸壬基酚聚氧乙烯醚单酯二乙醇酰胺含量的方法。实验测定内标工作曲线为A＝0.007 6m+0.325 6相关系数r2＝0.999 7，通过对方法重现性和回收率的考查，得到了较为满意的结果。该法是确定合成柠檬酸壬基酚聚氧乙烯醚单酯二乙醇酰胺产品的反应程度和控制产品质量的一种必要手段，证明了由柠檬酸合成柠檬酸壬基酚聚氧乙烯醚单酯二乙醇酰胺的工艺路线是可行的。

Determination of Citric Acid Mono Polyethyleneoxide Nonyl Phenyl Ether Amber Diehylene Glycoldinitrate Diglycollic Amide by IR

In the present paper,citric acid,acetic anhydride,polyethyleneoxide nonyl phenyl ether and diethanolamine were used as raw materials.The raw materials were purified,and the intermediate products were synthesized.Finally,the citric acid mono polyethyleneoxide nonyl phenyl ether amber diehylene glycol dinitrate diglycollic amide was made.The acidamide of the product synthesized was determined by IR.There is a characteristic peak of CO in acidamide at 1 642.39 cm-1.Using potassium rhodanate as a internal standard,and according to Lambert-Beer law,a method to determine the citric acid mono polyethyleneoxide nonyl phenyl ether amber diehylene glycol dinitrate diglycollic amide was developed.The linear regression equation is A=0.007 6m 0.325 6 with a correlation coefficient(r2) of 0.998 9.The experimental results of the precisions and recoveries are satisfied.The method is very necessary for confirming the reaction extent and controlling quality of citric acid mono polyethyleneoxide nonyl phenyl ether amber diehylene glycol dinitrate diglycollic amide.So,the synthesis process conditions were right according to the IR data.