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US 11,439,985 B2Granted
Nitration of benzene
AssigneeCouncil of Scientific and Industrial Research
InventorsShubhangi Bhalchandra Umbarkar, Atul Balasaheb Kulal, Mohan Keraba Dongare
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Abstract
The present invention discloses a process for nitration of benzene. More particularly, the present invention discloses an efficient, environmental friendly process for the nitration of benzene using a modified solid acid catalyst.
Claims12
A benzene nitration catalyst comprising hydrophobic solid acid WO3/SiO2 grafted with an organosilane selected from a C2 to C10 alkyl trialkoxysilane.
A process for preparing a benzene nitration catalyst comprising the steps of:
- a. dispersing 20% WO3/SiO2 in dry toluene to form a mixture:
- b. adding an organosilane selected from an alkyl trialkoxysilane to the mixture of step a;
- c. heating the resultant mixture of step b with constant mixing to obtain a powder and
- d. drying the resultant powder of step c to obtain the benzene nitration catalyst.
1 more element
A process for nitration of benzene comprising the steps of:
- a) charging benzene and a grafted hydrophobic solid acid catalyst in the range of 1:0.1 to 1:1 in a reactor flushed with nitrogen to form a reaction mixture followed by refluxing the reaction mixture at a temperature in the range of 90 to 110° C. for a period in the range of 1 to 2 hour and
- b) adding nitric acid to the reaction mixture of step (a) with constantly removing by azeotropic distillation of the water formed followed by refluxing the resultant reaction mixture at a temperature in the range of 90 to 110° C. for a period in the range of 6 to 8 hour to form a mononitrobenzene.
Dependencies are inferred from the claim text.