College of Engineering & Architecture
Assignment TWO
Spring 2014/ 2015 Semester
Fundamentals of Chemical Engineering CHPE202Dr. Yasir Ali Elsheikh
Due to date 30.03.2015
Student Name: …………………..……………………………………………..
Student ID: …………………..………………………..
(This is an individual Assignment)
1) A 5.0 molar aqueous solution of nitric acid (HNO3) flows into a process unit at a rate of 1.25 m3/min. The specific gravity of the solution is 1.51. Calculate:
a. the mass concentration of HNO3 in kg/m3.
b. the mass flow rate of HNO3 in kg/s.
c. the concentration of HNO3 in ppm.
2) An industrial-strength drain cleaner contains 5 kg of water and 5 kg of NaOH. Calculate the mass (weight) fractions and mole fractions of each component in the drain cleaner container.
3) A 1200 kg/hr of mixture containing equal parts by mole of methanol and ethanol is distilled. Product streams leave the top and the bottom of the distillation column. The flow rate of the bottom stream is measured and found to be 450 kg/hr and contain 5 wt% methanol.
a. Draw and label a flowchart of the process.
b. Calculate the mass and mole fractions of methanol and the molar flow rates of methanol and ethanol in the top product stream.
4) A liquid mixture of benzene (B) and toluene (T) containing 55% B by mass is fed continuously to a distillation column with a feed rate of 100 kg/h. A product stream leaving the top of the column (overhead product) contains 85% B and a bottom product stream contains 10.6% B by mass. Determine the mass flow rate of the overhead product stream and the mass flow rate of the bottom product stream.
5) A mixture containing 45% benzene (B) and 55% toluene (T) by mass is fed to a distillation column as shown in the Figure below. An overhead stream of 95 wt% B is produced, and 8% of the benzene fed to the column leaves in the bottom stream. The feed rate is 2000 kg/h.
Determine the overhead flow rate (D) and the mass flow rates of benzene and toluene in the bottom stream.