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Citation: LIU Li-Rong, LÜ Chun-Xua, LI Xia. Regioselective Nitration of Toluene in the Presence of Solid Niobic Acid Catalysts[J]. Chinese Journal of Applied Chemistry, ;2007, 24(12): 1374-1377. shu

Regioselective Nitration of Toluene in the Presence of Solid Niobic Acid Catalysts

LIU Li-Rong ^a,b,, ,
LÜ Chun-Xua ^a ,
LI Xia ^a

1.
a Deptartment of Chemistry, Nafing University of Science and Technology, Najing 210094;
2.
b Deptartment of Chemical Engineering, Huaihai Institute of Technology, Lianyuangang 222005

Corresponding author: LIU Li-Rong,
Received Date: 22 January 2007
Available Online: 22 April 2007
Fund Project: 江苏省自然科学基金资助项目(BK99071) (BK99071)

A series of niobic acids at different calcination temperatures was prepared.BET,acid amount and distribution of acidity of niobic acid catalysts were investigated.The effects of all kinds of factors,just like calcination temperature of niobic acid catalysts,nitration reaction time,nitration reaction temperature,recovered catalyst,acetic anhydride and concentration of nitric acid were studied by gas chromatography(GC).The nitration of toluene was carried out in the presence of acetic anhydride with CCl₄ as solvent,95% nitric acid as nitrating reagent,and niobic acid calcinated at 300℃ for 3 h as catalyst for 60 min at 40℃.A yield of 99.3% of mononitoluene with an ortho-para-isomer ratio of 1.26 was obtained,which is greatly below 1.67 with sulfonitric acid as catalyst.The catalyst could be re-utilized up to five times with little decrease in activity.It is a clean nitrated reaction catalyst in vast prospects of application.
- niobic acid,
- catalyst,
- toluene,
- nitration
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