The present invention relates to a method for preparing a polyurethane foam which comprises reacting an organic polyisocyanate and a polyol in the presence of water as a blowing agent, a cell stabilizer, and a tertiary amine amide catalyst composition represented by formula (I): ##STR00001## wherein A, R.sup.1 R.sup.6, and n are defined herein and wherein the tertiary amino amide catalyst of formula I is acid-blocked.


> Model predictive control having application to distillation

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