Assigment 3 Flashcards
Why you do this?
Because i am Haiyan
Nihao
Name the five lines in the McCabe-Thiele method
- Equilibrium line
- x=y line (45degrees) / reference line
- Rectifying line
- Stripping line
- Feed line
What is the McCabe-Thiele method?
The McCabe Thiele method is a method used to determine the number of theoretical trays/ideal stages to get to the desired concentration.
Leaching is an example of seperation process name three other.
- Distillation
- Filtration
- Sedimentation by gravity/centrifuge
What is crystallization?
Crystallization is a seperation process where a solute transfers from being dissolved in liquid to precipitate as a solid.
When is extraction preferable over distillation?
Name at least 2 cases:
- When the boiling points of the two substances are close to eachother.
- When the substance is heat sensitive
- When the solute is in a very low concentration and therefore there’s a lot of water. (water need to be vaporized, cost $$$$$$)
What is filtration?
Filtration is a seperation process in solid and fluid is seqerated using a filter medium.
What is cake filtration?
Cakefiltrationis used to remove bigger solids and only allow small particales and fluid to pass.
Name three things that α is dependent on:
(k_2·(1-ε))
α = ______________
((ϕ_s·D_P )^2·ε^3·ρ_P )
- Spherictiy: ϕ
- Particle size: D_P
- porosity: ε
- Density of particles: ρ_P
What is R_m (Filter medium resistance) is dependent on?
Name two factors:
(∆P·A) 1
R_m= \_\_\_\_\_\_\_\_ * \_\_\_
μ q_0- Pressure: ∆P
- Area of the medium: A
- Viscosity of the feed: μ
How do you determine if the filtercake compressible or imcrompressible?
α = α_0 · (∆P)^s
By performing several filtrations at several pressures, and then plot the natural logarithm of the cake resistance against the natural logarithm of the pressure, and if the slope is greater than zero the filtercake is compressible: α = α_0.
Explain rotary drum filtration.
It’s a filtration method in which suction is utilized to pick solid on a wheel from a solid liquid medium .
