Olefin plant revamp affects process control, real-time optimization

Paul D. Leggett, Elizabeth A. TeeterEquistar Chemicals LP, Channelview, Tex.R. Mark StoutAspen Technology Inc., HoustonOlefins unit revamps impact existing advanced process control (APC) and closed-loop real-time optimization (CLRTO) systems. Although it is expensive to update these systems after a process-unit revamp, more-efficient unit performance usually justifies the update.Equistar Chemicals LP, a joint venture among Lyondell Chemical Co., Millennium Chemicals Inc., and Occidental Petroleum Corp., recently updated the application systems in both of its Channelview, Tex., olefins units in response to process changes from a revamp.During planned maintenance shutdowns in 1995-1996, Equ...

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