Low‐density polyethylene vessel reactors: Part II: A novel controller

By the use of an imperfectly mixed model developed for LDPE vessel reactors, we show that a linear controller cannot perform satisfactorily in the entire range of operating conditions of industrial interest. Based on the concept of reaction rate control, a novel controller is developed which provides satisfactory closed‐loop dynamics independent of steady‐state conditions. A nonlinear controller is shown to be more effective in avoiding reactor light‐off.