110年 - 110 國立臺灣大學_碩士班招生考試_ 化學工程學研究所、綠色永續材料與精密元件博士學位學程丙組:化工熱力學與反應工程#100825

科目：台大◆化工◆化工熱力學與反應工程 | 年份：110年 | 選擇題數：0 | 申論題數：17

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所屬科目：台大◆化工◆化工熱力學與反應工程

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申論題 (17)

1. Give the definitions of the space time and the space velocity for a flow reactor.

2. How many kinds of chemical rectors you know of. Please explain them in detail.

3. What is the second law of thermodynamics?

4. How many degrees of freedom are there for a liquid mixture containing water and oil?

5. The constant-volume heat capacity of an ideal gas should NOT be a function of temperature. (True or False?)

6. The Joule-Thomson process refers to as an isentropic process. (True or False?)

7. When phase I is in equilibrium with phase II and phase II is in equilibrium with phase III, phase I must be in equilibrium with phase III. (True or False?)

8. A PFR operating isothermally at 773 K is used to conduct the following elementary reaction: A →＞ B+ C. If a feed of pure A enters at 5 atm and at a flow rate of 0.193 f'/s, what length of pipe with a cross-sectional area of 0.0388 f is necessary for the reaction to achieve 90% conversion? Data: & = 7.80 x 10' exp[-19,200/T] sl.

a. What are the PFR and CSTR volumes necessary to achieve 40% conversion?

b. Over what range of conversion would the CSTR and PFR reactor volume be identical?

c. What is the maximum conversion that can be achieved in a 105 dm' CSTR?

d. What conversion can be achieved if a 72 dm? PFR is followed in series by a 24 dm3 CSTR?

a. Derive the rate expressions for this mixed-parallel series-reaction network and the expression for the percent selectivity to the epoxide (EP), namely, Sep = rEP/(rEp + ICD).

b. Calculate the maximum epoxide selectivity (Sepmar) attained.

a. How many immiscible liquid phases are there in this system at the bubble point?

b. Please determine the mole fraction of B in vapor phase at the bubble point.Note: A, B, and C may or may not be miscible in liquid phase. You can assume Raoult's Law applies for any homogeneous liquid mixture that may exist in this system. Your answer should be based on the calculation. A random guess will get no credit.

12. A rigid box of a volume of 1 m³contains 1 mole of nitrogen at T = 300 K. The box is connected to a
high-pressure nitrogen gas line at P = 200 kPa and T = 280 K via a valve. The valve is opened and one mole of nitrogen flows into the box. The valve is then closed. The process mentioned above occurs in a very short time, and the temperature of the box increases during this process.
Then heat exchange occurs between the box and the surroundings (which are also at 300 K), and the
temperature of the box returns to 300 K. Please calculate how much heat is exchanged between the box and the surroundings.
Note: You can assume nitrogen behaves like an ideal gas with Cp of 29 J/(mole K) under all conditions.