Complete Technology and Catalyst for Preparing Benzonitrile By Ammoxidation Of Toluene

Toluene ammoxidation to benzonitrile technology uses toluene, ammonia, and air as raw materials to produce benzonitrile in one step through a gaseous ammoxidation reaction. Benzonitrile as a solvent can be used to produce nitrile based rubber, resin polymer, and coating products. It is also commonly used in the synthesis of benzene melamine, which can be further synthesized into metal coatings, decorative plates, fluorescent pigments, etc. Since the 1990s, the Shanghai Research Institute of Petrochemical Industry began to study the technology of benzene gas phase ammoxidation to benzonitrile, and successfully developed three generations of catalysts BN-97, BN-98, and BN-10. Based on the above catalyst, a complete set of ammonia oxidation technologies for toluene was developed and successfully applied in industry. The project has obtained a total of 5 authorized invention patents at home and abroad, and won the first prize of Science and Technology Progress of PetrochemicalFederation, the China Patent Excellence Award, the second prize in Shanghai Science and Technology Progress, second prize in Shanghai Patent Invention, and the first prize of Shanghai industry-University-Research Institute.

◆ High activity and selectivity: The catalyst has a high conversion and selectivity, the latest generation of BN-10 benzonitrile catalyst weight yield of more than 92%.

◆ The material consumption and energy consumption in the production process is significantly reduced. Compared with the original technology, the reaction temperature is reduced by about 50℃, the ratio of air to ammonia is also reduced, the use of water in the reaction of raw materials is avoided, and the loading capacity of the catalyst is significantly stronger than the original technology, effectively reducing the production cost. By using high-performance narrow distribution fine particle catalyst and high efficiency fluidized bed, the process conditions of the reaction are optimized, and the ammonia ratio and space ratio of the reaction process is effectively reduced compared with the traditional technology and the waste discharge is reduced.

◆ Well-designed turbulent fluidized bed reactor: The specially designed turbulent fluidized bed reactor can achieve good fluidization quality and reaction transfer effect of fine particle catalyst, and ensure the stable operation of the reaction.

The main features of benzonitrile catalyst are as follows:

◆ Catalyst long life: the catalyst has good stability, and the overall replacement cycle for industrial applications can be up to five years or more.

◆ The performance of the catalyst is improved obviously. The yield of benzonitrile increased from 58.5wt% to 92. 5wt% when the conversion of toluene was the same, and the selectivity of the catalyst was improved.

Since the first industrial test of benzonitrile technology in 1997, it has been applied in 3 enterprises and achieved good economic benefits.

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