June 2001

Letters to the Editor

Letters to the editor

How to control a deethanizer The article "Increase MPC project efficiency using multivariable closed-loop identification" (March 2001) may have described a method of testing for MPC that improved on e..

How to control a deethanizer The article "Increase MPC project efficiency using multivariable closed-loop identification" (March 2001) may have described a method of testing for MPC that improved on existing methods; it certainly did not shed any light on how to control a deethanizer. The capacity and efficiency of a deethanizer are maximized at the minimum available pressure. This is a significant factor in a distillation train as these columns act as a bottleneck in hot weather. Another issue is the need to balance condenser cooling against reflux flow where the distillate is withdrawn as a vapor or condensed separately. The authors mentioned none of this. They complain about the ill

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