Through IR analysis, the main component in group II was identified as dialkyl-benzene, while in Group III was monoalkyl-benzene as well as dialkyl-tetralin and indane (DTI).

然后用紫外法求得了第Ⅱ族组分中邻、间二烷基苯之和与对二烷基苯的质量比约为1∶409。