Preparing sym-tetramethylbenzene from tetramethylbenzene technology is refer to isomerism tetramethylbenzene by catalyst to produce sym-tetramethylbenzene.
Sym-tetramethylbenzene is an important chemical raw material, It is mainly used for the preparation of homophenyltetracylic anhydride, also used in the production of polyimide resin, dye ,plasticizer, surfactant and so on.
Sym-tetramethylbenzene production methods include: recrystallization separation of heavy aromatics, tetramethylbenzene isomerism, alkylation of trimethylbenzene. At present, the recrystallization separation of reformed heavy aromatic hydrocarbons is generally adopted in the industry.
1， Material
Tetrazolene or C10 aromatics containing tetrazolene.
2， Physicochemical properties of catalysts
Item | Index |
Appearance | White stripe |
BET（m2/g） | ≥320 |
Crushing strength (N/cm) | >80 |
Size (diameter) mm | Φ1.8-2.2 |
Bulk density Kg/m3 | 550-650 |
Ni Content % | 0.5～1.0 |
Mocontent % | 0.5～1.5 |
3，Process conditions
Item | Isodurene prepare durene |
Temperature ，℃ | 250-330 |
Pressure ，MPa | 1.0-2.0 |
Volume SV，h-1 | 1.0 |
Vapor liquid ratio ，v：v | 200～500 |
4，Technical flow diagram
5，Process characteristics
Using hydrogen isomerism, the catalyst life is long; full utilization of C10 aromatics resources, has high economic benefits.