Assignment 3 Magnus

Question 1

McCabe-Thiele Method

Answer 1

• There are an operating and equilibrium line.
• The operating line is constructed
• Equilibrium stages is the number of stages need in order to obtain the desired concentration for the product.

Question 2

Counter current extractor

Answer 2

It is counter current extraction, so the high concentration in the feed solution is washed by a solvent that all ways have a lower concentration. Stage 1 have higher concentration than stage 2

Question 3

Construct equilibrium line

Answer 3

x value = y value from 0 to 1

Question 4

Leaching

Answer 4

Leaching is the extraction of a certain desired material or component, from a solid into a liquid. In this example its MgSO_4 in a solid feed, which is treated with a solvent warm water.

Question 5

Operating line

Answer 5

Operating line is found by finding the composition of all streams, This is done by finding the mass balance over the entire system. And then for each stage. The operating line is then found for the composition of the stream between all stages (x1, y2) (xa, ya) etc.

Question 6

Equilibrium stages

Answer 6

Each of the stages is in equilibrium, which means that the concentration of MgSO_4 is the same in the x leaving and the y leaving streams.

Question 7

How is the crystallization process

Answer 7

The mixtures is evaporated to the an equilibrium in crystal and liquid and then cooling the mixture down.

Question 8

What is filtration?

Answer 8

Filtration is a proces where particles are separated from the liquid by af filter medium. And then there is af filter cake with all the particles.

Question 9

What is Alpha?

Answer 9

specific cake resistance

Question 10

What is Rm

Answer 10

filter medium resistance

Question 11

Crystal properties that can affect the filtration process

Answer 11

• Φ is the sphericity
  ε is the porosity
  Dp is particle size

Question 12

Filtercake, compressible or incompressible

Answer 12

α = α0 · (∆P)^s

Question 13

Rotary drum filter

Answer 13

• A rotary drum filter works like so, the wheel is partly submerged in the filtrate (slurry) the wheel is cover with a cloth which makes sure the solid doesn’t pass through however there is suction from the middle going out which means that all moisture gets sucked through, into the central duct, the cake stays on the wheel gets water with clean water for impurities which is the sucked through the central duct. With leaves the wheel with the solid products, which is the pushed out in one end, and cut with a knife into a desired size