Complete Technology and Catalyst for M/P-Xylene Ammoxidation Process/P-Xylonitrile

M/p-xylene ammoxidation to p/p-xylene nitrile technology is based on M/p-xylene, helium, and air as raw materials, through gas phase nitrogen oxidation reaction to produce M/p-xylene nitrile reaction technology. Isophenonitrile is one of the main raw materials of the broad-spectrum low-toxicity fungicides Chlorothalonil, and can also be used in the production of several bactericidal and insecticidal products: p.phenylphthalonitrile can be used in the production of pyrethroid insecticides. In addition, M/p-phthalonitrile can also be used to synthesize nylon septum resin, isocyanate, polyimide, and other synthetic materials. Since the late 1990s, Shanghai Research Institute of Petrochemical Industry began studying the technology of p-p-xylene gas phase nitrogen oxidation to p-p-p-phthalonitrile and has successfully developed four generations of catalysts, the latest generation of catalysts is NC-lV. Based on the above catalyst, the Shanghai Research Institute of Petrochemical Industry has developed a complete set of technologies for M/p-xylene ammoxidation and successfully applied them in the industry.

The project has obtained a total of 9 authorized invention patents at home and abroad, and won the first prize of Science and Technology Progress of the Petrochemical Federation, the China Patent Excellence Award, and the second prize from the Sinopec Patent Group.

◆ High activity selectivity: The catalyst has a high conversion and selectivity, and the weight yield of the latest generation of NC-IV m/p-phthalonitrile catalyst can reach more than 92%.

◆ The material consumption and energy consumption in the the production process is 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 of 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 ammonia ratio and space ratio of the reaction process are 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 M-xylene ammonia oxidation 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 was significantly improved. The yield of M/p-phthalonitrile by weight can reach over 92%.

Methanol vapor phase amination catalyst for methylamine production has been applied in more than 20 sets of industrial plants for more than 50 times. The new A-16 methylamine catalyst will achieve industrial application in 2020, and its performance indicators are better than A-6A catalyst.

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