Caprolactam refining special amorphous alloy catalyst


Caprolactam is the abbreviation of ε-caprolactam, white scaly solid with a melting point of 69.3 °C. Most of them are used in the production of polycaprolactam. About 90% of the latter is used to produce synthetic fibers, namely Kapron (polyamide fibers), 10% as plastics, and a small amount to produce lysine. Caprolactam can also be used directly for spinning or directly cast to make MC nylon (polyamide). When used in the production of cord thread, there are strict requirements for the potassium permanganate value of caprolactam.
  
The hydrogenation reaction of the post-caprolactam refining process turns unsaturated impurities into saturated impurities by hydrogenation. Using ordinary Rainey nickel catalyst, the product has low potassium permanganate value and high single consumption. Using amorphous alloy catalyst, most of the potassium permanganate value is greater than 30,000 seconds, and the excellent grade rate of finished caprolactam reaches 100%, so that caprolactam can not only be used in industry, but also in high-speed spinning production of civilian products.
  
Amorphous alloy catalyst is a high-tech product produced by Anshan Zhongli Catalyst Factory, which can be used as an alternative to traditional Reni nickel catalyst for industrial use. The catalyst is widely used in petrochemical, fine chemical, pharmaceutical and oil hydrogenation and other fields, and has been well received by users. The amorphous alloy catalyst won the first prize of national technological invention in 2005.
 

Main characteristics of amorphous alloy hydrogenation catalyst
· It is an alternative to traditional Raeney nickel catalysts
· It adopts ultra-quenching technology and has a special structure
· The unique process guarantees high activity, high selectivity and stability, long life and low single consumption
· Fast sedimentation speed and easy separation from the product
· Strong magnetism, especially suitable for magnetic fast separation, magnetic stable bed reactor
· The specific surface area of BET is greater than 100m2/g
· The specific surface area of active nickel is 22.5-24.0 m2/g
· Hole volume 0.10-0.12 ml/g


ZL-N411/ SRNA-4 amorphous alloy catalyst has special activity for nitro hydrogenation. The most typical application is caprolactam hydrorefining reaction, which has a good application performance in many caprolactam manufacturers such as Baling Petrochemical and Shijiazhuang Refining.
  
At present, our company supplies all domestic caprolactam manufacturers caprolactam aqueous solution hydrogenation catalyst, there has never been a quality problem, and has been praised by the majority of users.
  
Our company is a designated supplier of A-grade products of Petrochemical. At present, all domestic caprolactam manufacturers use amorphous alloy hydrogenation catalysts produced by our company, with a coverage rate of 100%, stable long-term running performance, low single consumption, and excellent products.
  
The design unit consumption of caprolactam hydrorefining is 0.2 kg/t CPL, and the operating unit consumption of ZL-N411 amorphous alloy hydrogenation catalyst of our company can be controlled below 0.1Kg/t CPL, the PM value before hydrogenation is 100-200S, and the PMing value of the product after hydrogenation can reach more than 20000S, all of which reach the standard of excellent grade.
 

Caprolactam hydrorefining index

Catalyst

Catalyst unit consumption

(Kg/t CPL)

PM value before hydrogenation

S

PM value after hydrogenation

S

Amorphous alloy hydrogenation catalyst

≤0.1

100-200

>20000

 

 

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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.