Chemical engineering formal origin

The formal origin of chemical engineering as a discipline is considered to date to 18S8 when it was introduced as an option in the chemistry department at the Massachusetts Institute of Technology... 

We note that the difference in (5.1.4) of the two extents of separation is merely the molar extent of reaction of the ith species normalized with respect to the total number of ith species originally present in the system. Thus, the traditional formalism of reaction engineering or reaction kinetics may he used to estimate directly the change in the extent of separation due to a chemical reaction. Such a straightforward result may not he valid if some of the assumptions made earlier break down. 

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