工业混合酚的拉曼光谱分析

尝试以拉曼光谱直接对工业混合酚中甲酚及二甲酚定性定量分析。用乙腈在2251cm^-1的C≡N伸缩振动峰作为内标,间甲酚在732 cm^-1处、对甲酚在839 cm^-1处以及2,6-二甲酚在667 cm^-1处的苯环变形振动选用为以上各组分各自的特征峰。通过实验得到乙腈与间甲酚、对甲酚、2,6-二甲酚的背反射显微拉曼相对拉曼截面,分别是（■σ/■Ω）732cm^-1/（■σ/■Ω）2251cm^-1=1.8416、（■σ/■Ω）667cm^-1/（■σ/■Ω）2251cm^-1=0.8557。分别对实验室模拟样及工业混合酚进行拉曼定量分析得到的结果与其他分析方法一致。

Industrial mixed phenols analysis using Micro-Raman spectroscopy

Feasibility analysis of using Micro-Raman spectroscopy for direct quantitative measurement of xylenols and cresols in typical industrial mixed phenols was conducted.Using acetonitrile at 2251cm"’ as reference,the back scattering configuration relative Raman cross section for benzene ring vibration of m-cresol at 732cm"1,of p-cersol at 839cm"’ and of 2,6-xylenol at 667cm"’ were obtained.They are (（■σ/■Ω）_732cm^-1)/(（■σ/■Ω）_2251cm^-1) =1.8416、(（■σ/■Ω）_839cm^-1)/(（■σ/■Ω）_2251cm^-1)=0.9974 and(（■σ/■Ω）_667cm^-1)/(（■σ/■Ω）_2251cm^-1) =0.8557 respectively.M-cresol,p-cresol and 2,6-xylenol mixture prepared in the laboratory and mixed phenols from the industry were used for validating the method.Results agree well with that using other methods.