For all reaction orders greater than 1, what is the appropriate order of reactor

ID: 701747 • Letter: F

Question

For all reaction orders greater than 1, what is the appropriate order of reactors? O PFR large CSTR-> small CSTR PFR-> PFR-> PFR PFR-> small CSTR-> large CSTR large CSTR-> PFR-> small CSTR In general, for a PFR and a batch reactor of the same volume performing the same reaction, more material can be processed in a 24 hr period by the PFR than can be processed by the batch reactor rue o False A bank of 4 PFRs is connected in parallel, all connected to a single feed header (ie., the feed stream to each reactor has the same composition). Which of the following conditions should be met to most efficiently utilize the available reactor volume? O All four outlet streams should be at the same temperature when re-combined. O This configuration is never efficient, and a CSTR should be used instead O All four outlet streams should never be re-combined. All four outlet streams should be at the same composition when re-combined. A single feed header is connected to three parallel reactor trains, each containing a different combination of PFRs and CSTRs, and the outlet streams are re-combined into a single outlet flow. How should this reactor system be analyzed? O Analyze each parallel leg as a single series of reactors, with a feed stream whose total flowrate is one-third that in the feed header and whose composition is equivalent to that in the feed header. The outlet stream is a sum of the three streams leaving the three parallel legs O Analyze each parallel leg as a single series of reactors, whose feed stream with the same flowrate as in the feed header. The outlet stream is a sum of the three streams leaving the three parallel legs. O Analyze the system as a single CSTR whose volume is the sum of all of the reactors in the system O Analyze each parallel leg as a single PFR whose volume is the sum of all the reactors in that leg. Under what conditions is the space-time for a batch reactor equivalent to that for a PFR? This is never true Constant-temperature systems Constant-density systems Variable-density systems The mean residence time in the reactor is the independent variable that designers manipulate to control the composition of the stream exiting the reactor rue o False

Explanation / Answer

(1). For the order greater than 1 ,

PFR -> small care -> large CSTR

(2) false .both can perform same amount of material unless the volume of batch reactor is less than amount feed.

PFR is continuous process where as batch reactor is not .so, time taken for feed in and feed out not considered .

(3) All four outlet streams are of same composition is required .this will improve the product yield

(4) flow rate must be 1/3 and composition must be same as feed .so first option is correct.

(5) for constant density systems both will have same volumes

(6) true . T= v/v0 it contains design variable of flow rate

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For all reaction orders greater than 1, what is the appropriate order of reactor

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