Product Isolation and Waste Treatment

Finally, the product (3) was purified using a three-stage continuous distillation process using Hastelloy wiped-film evaporators (WFEs). The key distillation, employing a WFE equipped with a fractionating column, required only a single pass to remove all process impurities with minimal product loss. The final Hastelloy WFE product distillation was required for product decolorization. 

The continuous manufacturing process yielded high quality 3 with significantly lower production costs (raw material utilization, energy, waste and manpower) than for the batch process. 

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