TDI Synthesis Process-Hydrogenation Reaction2021-03-05

The manufacturing technology of TDI in the world is mainly divided into two major factions: one is the traditional process based on Swedish DuPont technology, and the other is the improved process represented by Germany's BASF technology.

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The manufacturing technology of TDI in the world is mainly divided into two major factions: one is the traditional process based on Swedish DuPont technology, and the other is the improved process represented by Germany's BASF technology.
 
In the core technology of the hydrogenation reaction (TDA synthesis) of the TDI process, the BASF process adopts turbo-type stirrer high-speed stirring and negative pressure hydrogen absorption technology.
 
The reaction uses ethanol as a solvent, and a nickel catalyst is used for catalytic hydrogenation.
 
Its advantages are uniform reaction, simple catalyst separation process, and low catalyst loss.
 
The disadvantage is that the mechanical seal of the reactor stirring device is easily damaged, and the standard of material quality is high.
 
The DuPont process uses a high-power and large-flow circulating pump reverse spray hydrogen absorption process. It uses a Palladium on carbon for catalytic hydrogenation.
 
The advantage is that the reaction does not need solvents. The disadvantage is that the energy consumption is high, the catalyst separation process is cumbersome, and the catalyst loss is large.