June 1998

Process Technology and Control

Successful closed-loop olefins plant optimization

Most of the important factors do not involve optimizer mechanics

Brewer, W. M., Lopez, S. F., BP Chemicals Ltd.

BP Chemicals Ltd. recently celebrated five years of continual success with closed-loop optimizers on the two ethylene crackers at its Grangemouth site in central Scotland. Several key factors have contributed to that success. This article avoids technical detail since readers who are interested in that aspect of optimization can find plenty of information elsewhere. Instead, the article concentrates on the practical aspects of optimization; factors that have been found to be far more significant than optimizer mechanics. Background. The BP Chemicals Grangemouth site has two ethylene plants. The older one, G4, started up in 1968. It has undergone several expansion and refurb

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