110年 - 110 國立高雄大學_碩士班招生考試_化學工程及材料工程學系：化工動力學#102203

1. Consider the following elementary reactions:

 What temperature progression and reactor types would you recommended if the desired product is: (a) R, (b) S, (c) T, and (d) U. (20%)

2. Monobutylphthalate and butanol react in the presence of H₂SO₄ forming dibutylphthalate and water. Reaction can be carried out in the continuous stirred tank reactor (CSTR). The reactants are placed in two separate tanks containing 0.4 mol/liter of monobutylphthalate and 2 mol/liter of butanol and fed to the reactor under 10 liter/h and 30 liter/h, respectively. The reactants are mixed before entering the reactor. The reaction rate constant is k = liter/(mol.min). Calculate the CSTR volume when conversion is 60%. (Reaction rate expression:   (20%)

3. Enzyme E catalyze the fermentation of substrate A to product R. Find the size of the continuous stirred tank reactor (CSTR) needed for 90% conversion of A in a feed stream (20 liter/min) of A (1 mol/liter) and enzyme. The kinetics of the fermentation at this enzyme concentration are given by (20%)

4. A liquid phase reaction A → R + S takes place in a system consisting of a CSTR and a plug flow reactor (PFR) with recycle. One introduces 2 kmol/m³ of reagent A into the first reactor (CSTR). Both CSTR and PFR operate isothermally at 400oC and atmospheric pressure. The volume of the first reactor is 0.086 m³ and the inlet flow is 3.2 m³/ks. The conversion at the outlet of the PFR is 90%. It is a first-order reaction and the reaction rate is (-rA) = 8 CA kmol/(m³.h). Calculate the PFR volume considering a recycle ratio of R = 1. (20%)

5. Consider the following elementary reactions:

   What reactor type gives the maximum yield of S? Roughly estimates this yield and the fractional conversion of A which will give this yield. (20%)