Industrial application report of hydrogenation to hexanediamine catalyzed by adiponitrile


The British Johnson Matthey A4000 Raini nickel catalyst used in the early stage of the hexanediamine plant has high activity and stable performance, but the price is high and the supplier is too single.
  
In order to further reduce the production cost of hexylenediamine and seek a better supplier of hexamethylenediamine hydrogenation catalyst, the hexamethylenediamine plant began to explore the application of new catalysts, and finally selected Liaoning Zhongli Fine Chemical Co., Ltd. through testing and investigation of many domestic catalyst manufacturers and products, and began industrial application on May 22, 2017. As of March 15, 2018, production has been running stably for nine months.
  
During the application of Liaoning Zhongli catalyst, the average activity index in the reactor increased from 0.57 to 0.578 before application, the catalyst activity was high, and the production and application were stable; through the comparison of the analysis data of S334 and S554 before and after the test, it can be seen that the selectivity of the catalyst was better than that of the imported catalyst; from the detection situation, the S331 sampling liquid and D410 overflow water basically did not contain the catalyst, which shows that the single-pass life of the catalyst is better; after the catalyst application, AY310B has a slower decline rate, F340/ The pressure of F344 increases slowly, and the wear and floating amount of catalyst in the reactor are within the normal range, which shows that the total life of Liaoning Zhongli catalyst is better.
  
According to the experimental data and experimental phenomena, Liaoning Zhongli catalyst was scored according to the scoring criteria in the above table, and its comprehensive score was 99 points, which achieved the expected experimental purpose.
   
Production application conclusion:
  
1. It can be seen from the physical and chemical analysis parameters that the particle size of Liaoning Zhongli catalyst can meet the production needs, has good fluidity in the reactor, and has high activity.
  
2. Due to the low wear rate of Liaoning Zhongli catalyst, the single pass life and total life are high, so the unit consumption is reduced after the use of Liaoning Zhongli catalyst.
  
3. From the analysis data of S331 and S554, it can be seen that Liaoning Zhongli catalyst can improve the yield of raw materials, inhibit the production of by-products and improve product quality.
  
4. Compared with imported catalysts, Liaoning Zhongli catalyst has obvious price advantages, and the production cost of hexanediamine is greatly reduced after the use of Liaoning Zhongli catalyst.
  
In summary, compared with the imported catalysts currently in use, Liaoning Zhongli catalyst not only meets and exceeds the imported catalyst in various indicators, which can meet the production needs, but also has obvious price advantages, which can effectively reduce production costs and improve product performance.

 

 

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Reni nickel catalyst science knowledge(1)

Physical and chemical properties: Reni nickel catalyst before activation is silver-gray amorphous powder (nickel-aluminum alloy powder), with a moderate degree of flammability, partial activation in the presence of water and the production of hydrogen easy agglomeration, long-term exposure to air is easy to weather. Nickel-aluminum alloy powder is activated into gray-black particles, accompanied by active hydrogen, extremely unstable, oxidative combustion in the air, must be immersed in water or ethanol for preservation. It was first used by American engineer Murray Rainey as a catalyst in the hydrogenation of vegetable oils. The preparation process is to treat nickel-aluminum alloy with concentrated sodium hydroxide solution, in this process, most of the aluminum will react with sodium hydroxide and dissolve, leaving a lot of micropores of different sizes. In this way, the surface of Raininickel is a fine gray powder, but from a microscopic point of view, each tiny particle in the powder is a three-dimensional porous structure, this porous structure greatly increases its surface area, and the large surface area brings high catalytic activity, which makes Raininickel widely used as a heterogeneous catalyst in organic synthesis and industrial hydrogenation reactions. Since "Rainey" is a registered trademark of Grace Chemicals, strictly speaking, only products manufactured by the company's Davidson Chemical Division can be called "Lanny Nickel". The term "metal backbone catalyst" or "sponge-metal catalyst" is used to refer to catalysts with a microporous structure and physical and chemical properties similar to Raney nickel.