Amorphous alloy catalysts are used for cyclobutene sulfone catalytic hydrogenation


Cyclobutene sulfone catalytic hydrogenation is one of the most important operating units in the production process of cyclobutene sulfone, the level of hydrogenation yield, the important index of cyclobutane sulfone products, 2-cyclobutene sulfone slip amount, heat resistance, etc. have a direct impact, but also related to the distillation process in the sulfur dioxide emission can meet the standard, therefore, optimize the cyclobutene sulfone catalytic hydrogenation process, improve the hydrogenation yield is particularly important.
  
The activity, addition amount and fluidization state of the catalyst (i.e. stirring efficiency) are important factors affecting the production cost of cyclobutene sulfone catalytic hydrogenation, and the use of amorphous alloy catalyst, the various indicators of the catalyst are better than the ordinary Rainey nickel catalyst, which can shorten the reaction time, improve the product yield and reduce the production cost.
  
Optimized process conditions for catalytic hydrogenation of cyclobutene sulfone: cyclobutene sulfone concentration 45%-50%; Pressure 2.3-2.5 MPa; Temperature 40-70°C; Catalyst increase by 5%; Reaction time 2.5 h.

 

 

 

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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.