Question

In a reactor two stream are entering, one with C6H6 at 10 atm and 27^oC, and another with H2 at 10 atm and 0^oC, producing C6H6, C6H12, and H2 at 10 atm and 23^oC, what are the total degrees of freedom?

(a) 10

(b) 12

(c) 15

(d) 16

This question was addressed to me in semester exam.

Enquiry is from Degrees of Freedom Analysis in division Energy Balances that Include the Effects of Chemical Reaction, Ideal Processes, Efficiency and the Mechanical Energy Balance and Heats of Solution and Mixing of Basic Chemical Engineering

Answer 1

Right answer is (d) 16

The explanation: Total species = 1 + 1 + 3 = 5, total stream flows = 3, stream pressures = 3, stream temperatures = 3, heat released = 1, and extent of reaction = 1, => degrees of freedom = 5 + 3 + 3 + 3 + 1 + 1 = 16.