Strategy of Distillation Startups and Shutdowns

Column startup usually consists of the following steps  

Commissioning. These operations are discussed in detail in Chap. 11. Commissioning operations clear the system of undesirable ma- 

The sequence of steps performed at startup typically follows the above order, with some deviations. Such deviations are often desirable (even necessary) to suit the system and available hardware. The best sequence of events must be judiciously determined considering the chemicals, the system, and the practices generally preferred for distillation startup. ITie latter practices are discussed in the following sections. 

The above sequence of steps is typical of shutdown operations. Other comments made above regarding the sequence of startup steps extend also to the sequence of shutdown steps. 

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