WANG Xiao, ZHANG Tian-yong*, LI Bin, HE Meng, SHI Hui-xian

(School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China)

Abstract: After nitrosation, addition, complexing and neutrallization reaction of 2-naphthol, C.I. Pigment Green 8(PG8) was synthesized. Catalytic hydroxylation of p-xylene catalyzed by PG8 in the presence of H₂O₂ was studied. PG8 has catalytic activity for the hydroxylation of p-xylene. Effects of catalyst dosage, reaction temperature, reaction time, solvents, and mole ratio of H₂O₂ to p-xylene on the hydroxylation were determined. Under the conditions: 20.0mL acetonitrile as the solvent, 0.1g PG8 as the catalyst, n(H₂O₂):n(p –xylene) = 5, reaction temperature 60℃, reaction time 5h, conversion of p-xylene is 55.9% with a yield of 2,5-xylenol 10.1%.

Keywords: C.I. Pigment Green 8; Hydroxylation; p-Xylene; H₂O₂; 2,5-Xylenol

E-mail: tyzhang@tju.edu.cn

Journal of Molecular Catalysis, Vol. 25, Issue 3, 2011, 244~249