Riverol, C.  , C. Carosi  , 
    Integration of Fuzzy Logic Based Control Procedures in Cryogenic Distillation,
    International Journal of Soft Computing,
    Volume 1,Issue 3,
    2006,
    Pages 187-192,
    ISSN 1816-9503,
    ijscomp.2006.187.192,
    (https://makhillpublications.co/view-article.php?doi=ijscomp.2006.187.192)
    Abstract: The automation of complex industrial processes is a difficult problem due to the extremely nonlinear and variable system behavior or conflicting goals within the different process phases. This article describes an approach in which underlying PID controllers were implemented via fuzzy logic. Traditionally, simple PID and feedforward control schemes do not function well in load-following applications over cryogenic distillation columns. However for high level control, simple controllers can be combined in a priority hierarchy such as this study illustrates using one distillation column.
    Keywords: Fuzzy logic;control procedures;integration;cryogenic distillation