# Chapter 13: Unsteady State Nonisothermal Reactor Design

## Additional Homework Problems

#### CDP13-A_{B}

Propylene glycol produced by the hydrolysis of propylene oxide as discussed
in Example 8-8 is to be carried out in a semibatch reactor (Figure CDP13-A).
A mixture of 33.3% methanol and 66.7% propylene oxide is fed to an 80-ft^{3}
semibatch reactor containing 30 ft^{3} of water at 120°F
with 0.1 wt % H_{2}SO_{4}.
The total molar feed rate is 2 lb mol/min at a

**Figure CDP13-A**

(a)What is the cooling water flow rate initially?(b)What is the cooling water rate after 6 min?

You may neglect the heat of mixing. The product of the overall heat-transfer coefficientUand the heat-exchange area,A, isUA= 6 x 104 Btu/h°F.

(c)Plot the conversion and temperature as a function of time for the case of a constant cooling water flow rate of 3000 lb/h. All other conditions remain the same.