Abstract
Noncontinuous processes involving batch and semicontinuous processing operations are typically subject to significant levels of process parameter variations. Intermediate storage is commonly used to mitigate the effects of these variations. A taxonomy and analysis is presented of the various types of parameter variations: elementary and composite, single and multiple, homogeneous and mixed, overlapping and nonoverlapping. Sufficient conditions are developed which insure that continuity of periodic operation can be maintained in the presence of these various types of process variations. These conditions serve as the basis of storage sizing procedures developed in the companion paper.

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