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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。
Attempt to qualitative and quantitative analysis of cresol and xylenol in industrial mixed phenol by Raman spectroscopy. The C≡N stretching vibration peak of 2251cm -1 was used as the internal standard of acetonitrile, at 732 cm -1 of m-cresol, at 839 cm -1 of p-cresol and at 2,6- The deformation vibration of benzene ring at 667 cm ~ (-1) of xylenol was chosen as the characteristic peak of each component above. The relative Raman cross sections of the back-reflection Raman spectra of acetonitrile and m-cresol, p-cresol and 2,6-xylenol were obtained through experiments, which were respectively (■ σ / ■ Ω) 732cm -1 σ / Ω Ω) 2251 cm -1 = 1.8416 (σ / Ω Ω) 667 cm -1 / (σ σ / Ω) 2251 cm -1 = 0.8557. The results of Raman analysis of laboratory analogs and industrial mixed phenols were consistent with those obtained by other analytical methods.