Complete Technology and Catalyst for Preparation Of Halogenated Benzonitrile By Ammoxidation Of Halogenated Toluene

Halogenated benzonitrile is produced by ammonia oxidation of toluene halogenated toluene, ammonia, and air-common halogenated benzonitrile products are O/p-chlorobenzonitrile, 0/p-bromobenzonitrile, 2,4-dichloro benzonitrile, 2,6-dichloro benzonitrile, and so on. 0-chlorobenzonitrile can be used in the production of azo disperse dyes, and is also one of the raw materials for the synthesis of Sartan antihypertensive drugs and a variety of anti-inflammatory bactericidal drugs. P-chlorobenzonitrile can be used in the synthesis of widely used pigments and liquid crystal materials; Several other products are used in the synthesis of pharmaceuticals, pesticides, and liquid crystal display materials. Since the late 1990s, the Shanghai Research of Petrochemical Industry began to study the technology of gas phase ammoxidation of toluene halogenated benzonitrile to produce halogenated benzonitrile and successfully developed halogenated benzonitrile catalyst based on the above catalyst, Shanghai Research Institute petrochemical Industry has developed a complete set of halogenated toluene ammoxidation technology and successfully realized industrial application.

The project has obtained 13 domestic and foreign invention patents, won the first prize in Science and technology Progress of the Petrochemical Federation, ChinaPatent Excellence Award, etc.

High activity and selectivity: The catalyst has high conversion and selectivity, and the weight yield of the latest generation halogenated benzonitrile catalyst can reach more than 87%.

The material consumption and energy consumption in the production process are significantly reduced. Compared with the original technology, the reaction temperature is reduced by about 40℃, the ratio of air to ammonia is also reduced, the use of water in the reaction raw material 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 oxygen ratio and space the 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 product prepared by the process has high purity, less by-products, and low refining cost, which effectively improves the competitiveness of China in the production field of the product, and the relevant technical indicators have reached the international leading level.

The main characteristics of ammoxidation of toluene halide are as follows:

◆ Long life of catalyst: the catalyst has good stability, and the overall replacement cycle for industrial applications can be up to more than four years.

◆ The performance of the catalyst was significantly improved. The yield of halogenated benzonitrile by weight can reach more than 87%. Compared with the original technology, the yield was increased by more than 20 percentage points and the service life of the catalyst was increased by 8 times.

Since the first industrial test of halogenated benzonitrile technology in 2000, it has been applied in many productions enterprises, and has a variety of different halogenated benzonitrile product production capacity, the total production the capacity of the production plant exceeds 30,000 tons/year, and has achieved high economic benefits.

A schematic diagram of the process flow of ammoxidation of toluene halide to benzonitrile halide

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