A Frame Work for Process State Transitions: Grade Changes

In English In modern chemical process industry, process state transitions, orgrade changes, are common operations. For example, for a papermachine, a common operation is to change the surface weight of theproduced paper. In this case it is of importance that the transitionto the new grade is done fast, but without a breakdown asa result. This paper addresses this problem by combining optimizationtechniques and a tool for sequential control, JGrafchart. The paperalso contains an example, where the proposed method has been appliedto the quadruple-tank process.