Control, closed loop, styrene

Considerable work has been done on mathematic models of the extmsion process, with particular emphasis on screw design. Good results are claimed for extmsion of styrene-based resins using these mathematical methods (229,232). With the advent of low cost computers, closed-loop control of... 

An optimum model-based predictive controller was developed to allow for control of molecular weight averages (intrinsic viscosities) and reactor temperatures in solid-state PET polymerizations, through manipulation of the inert gas temperatures and flowrates [ 199]. Simulation studies also showed that predictive controllers might lead to significant improvement of process operation in PVC suspension reactors, when temperatures are allowed to vary along the batch time [200]. Simulation studies performed for continuous styrene solution polymerizations showed that the closed-loop predictive control can also be used to stabilize the reactor operation at unstable open-loop steady-state conditions [201]. 

---