Seminar 6 (Spring-Summer 2019) with solutions.pdf -...

  • No School
  • AA 1
  • 8

This preview shows page 1 - 2 out of 8 pages.

DEPARTMENT OF CHEMICAL & MATERIALS ENGINEERING ChE 316 Equilibrium Stage Processes Spring-Summer 2019 Seminar 6 (June 26, 2019) 1 Q1. Gas-Liquid System, Absorption An absorber is being employed to absorb CO 2 from air into a dilute-caustic solution. The entering gas containing 3 mol % CO 2 with a flow rate of 792 lbmol/h at 60° F, 1 atm where equilibrium is given as y = 1.75 x (units are in mole fractions). Assume caustic solution has the properties of water. It is desired to recover 97% CO 2 in the liquid outlet stream. The solvent rate is 1.4 times the minimum solvent rate. The equilibrium data can also be found in figure 1. Determine: i) Maximum possible concentration of CO 2 in the caustic solution ii) Minimum caustic solution-to-air molar flow rate ratio iii) Caustic solution rate iv) The number of equilibrium stages required ( both graphically and analytically by Kremser equation ) Q2. Gas-Liquid System, Stripping A stripping column uses air to regenerate a liquid stream containing 1 mol % of a solute. It is expected to remove 98% of this solute. The air stream used for stripping is free of the solute and the equilibrium distribution of the solute in the liquid and the air stream is given by y = 0.1x + 0.01x 2 (y and x are mole fractions of the solute in the gas and liquid phase respectively). The equilibrium data can also be found in figure 2. Answer the following: (a) What is the minimum amount of air stream needed to achieve the necessary separation? (b) If in the real operation, the air flow rate used is 1.5 times more than the minimum amount, what is the number of plates needed for the given operation?
Image of page 1

Subscribe to view the full document.

Image of page 2

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes