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p-cresol and 2,6-xylenol are extremely difficult to separate through traditional multi-level fine distillation since their boiling points are so alike.It has been reported that tert-butanol can be used as an adduct formation additive in crystallization process.However,reaction mechanism has not been reported yet.In this contribution,Raman spectroscopy and density functional theory(DFT)calculation were used to study the association complex of p-cresol and tert-butanol.