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对木质素磺酸、酚化木质素磺酸及环氧化木质素磺酸的红外光谱进行比较，并分析得到谱图中出现的位于1145cm－1、1043cm－1、834cm－1、757cm－1和693cm－1附近的红外峰的归属。结果表明这些峰与横酸基团和苯环取代结构密切相关，而且，酚化反应中木质素横酸的酚化程度和产物的取代本环结构可由木质素磺酸及其酚化产物的红外光谱图的变化得到定性反映。
The IR spectra of lignin sulfonic acid, phenylenated lignin sulfonic acid and epoxidized lignosulfonic acid were compared and analyzed. The results of the infrared spectra at 1145cm-1, 1043cm-1,834cm-1 and 757cm-1 And the infrared peak near 693 cm-1. The results showed that these peaks are closely related to the substitution of the acid group and the benzene ring. Moreover, the degree of phenolics of the lignin acid in the phenolic reaction and the substituted ring structure of the product can be determined by infrared spectroscopy of lignosulfonic acid and its phenolics Spectral changes have been qualitatively reflected.