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 C6H12 and H2 at 10 atm and 23^oC, what are the total degrees of freedom?

(a) 10

(b) 15

(c) 20

(d) 23

The question was asked in unit test.

Query is from Degrees of Freedom Analysis topic in portion 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 option is (b) 15

To explain I would say: Total species = 1 + 1 + 2 = 4, total stream flows = 3, stream pressures = 3, stream temperatures = 3, heat released = 1, and extent of reaction = 1, => degrees of freedom = 4 + 3 + 3 + 3 + 1 + 1 = 15.