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Consider the CSTR in Figure Q7.1. No product is present in the feed stream, a si

ID: 502293 • Letter: C

Question

Consider the CSTR in Figure Q7.1. No product is present in the feed stream, a single chemical reaction occurs in the reactor, and the heat of reaction is zero. Determine whether each of the following single-loop control designs is possible. Consider each question separately. Control the product concentration in the reactor by adjusting the valve in the pure A pipe. Control the product concentration in the reactor by adjusting the valve in the coolant flow pipe. Control the product concentration in the reactor by adjusting the valve in the solvent pipe. Control the temperature in the reactor by adjusting the valve in the pure A pipe. Control the temperature in the reactor by adjusting the valve in the coolant flow pipe. Control the temperature in the reactor by adjusting the valve in the solvent pipe.

Explanation / Answer

a) It is possible to control the product concentration by adjusting the valve in pure A line. As concentartion of product (CA) is function of initial concentration (CA0) and CA0 depends on amount of pure A.

b) It is not possible to control the product concentration by adjusting the valve in coolant flow pipe. As reaction heat is zero.

c)  It is possible to control the product concentration by adjusting the valve in solvent line. As concentartion of product (CA) is function of initial concentration (CA0) and CA0 depends on amount of solvent.

d)  It is not possible to control the temperature in the reactor by adjusting the valve in pure A pipe. As reaction heat is zero.

e) It is possible to control the temperature in the reactor by adjusting the valve in coolant flow line. Temperature varies based on cooling water flow in jacket.

f) It is not possible to control the temperature in the reactor by adjusting the valve in solvent pipe. As reaction heat is zero.

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