Since two equal CSTR in series give a higher conversion than two in parallel, are reactors in parallel ever used to increase conversion?
Not for a CSTR, only a PFR/PBR when there is a significant pressure drop. • The Damköhler (Da) number • What is the Damköhler number? See p.138 of text. • How is the Damköhler (Da) number defined for a reaction (A + B C) when the reaction is first order in A, first order in B, but second order overall? Just substitute the rate law evaluated entrance to the reactor, -rA0, [e.g. -rAo=kCAoCBo] into the definition . See p.138. • Is Da always indicative of certain conversion? Yes, for irreversible reactions. • How does defining an extra variable, the Damkhler number, save us time and confusion, as opposed to solving without it? When should it be used? It serves as rule of thumb. When Da < 0.1 then X < 10% and when Da >10 then X >90%. See margin note p.138 of Ch.4. • Why do they use a batch reactor to determine k if they are going to be using CSTR in actual industrial process? Batch experiments are most always easier to take the necessary data to determine k. • In what cases would you use th
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