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A surrogate model to implement an extraction column of in?nite height in pro- cess simulation software is presented. The model consists of three decanters and a few speci?cations which are easy to implement in commercial process simula- tors. Using the model, the minimum solvent ow rate and the limiting product compositions are determined. In an example, the surrogate model for the ex- traction column is combined with standard unit operation models for describing an extraction process with a distillative solvent recycle.
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