Phosgene-free synthesis of hexamethylene-1,6-diisocyanate by the catalytic decomposition of dimethylhexane-1,6-dicarbamate over zinc-incorporated berlinite (ZnAlPO4)

- Synthesis of HDI via HDU decomposition over ZnAlPO4 heterogeneous catalyst.
- Employment of self-designed reliable fixed bed reactor for HDU decomposition to HDI.
- As high as 89.4% yield of HDI over ZnAlPO4 catalyst.
- High stability and large ability for repeating usage of ZnAlPO4 catalyst.