Flexsys patented process

The newer Flexsys patented process shown in Figure 11.21 is much more efficient than the older synthesis routes, with a 95% reduction in waste. There is no production of hydrochloric acid byproduct, and there is no need for the use of chiorinated benzene feedstocks. This process received the Environmental Protection Agency s Presidential Green Chemistry Challenge Alternative Synthetic Pathways Award, and Flexsys spent about 70 million on the construction of a new piant for this PPD2 process in Antwerp, Belgium. 

Figure 11.21 Flexsys patented process for the synthesis of N-1,3-dimethylbutyl-N -phenyl-p-phenylenediamine (6PPD)...

Flexsys patented PPD 2 process for 4-aminodi-phenylamine (4-ADPA)... 

---