Help , liquid-liquid extracction

[daysyworld]

Hello, I've been two days trying to resolve this problem and I can't.

I will try to translate it.

To liquid, A and B have very similar boiling point. Because of that would be separate by liquid-liquid extraction with a dissolvent C.

Calculate the minimum quantity of extract we have to return of the product of extract and the refined quantity to obtain a 82% A 17% B extract ( solvent free basis) and 10% A 90% B refined ( solvent free basis too).

Feed is 35% A, 65 % B ( solvent free) and it is a saturated refined.

Calculate the ideal number of stages at the both sides of feeding with the same feed to get the same final product when the reflux relation (on kg of extract with solvent) / kg of extract product is the double of the minimun value

The feed is 1000kg .

Do on equilateral triangle, rectangle triangle and solvent free coordinate graph.

Thank you very very much.

 

[siddharth]

This looks like a homework problem. The forum rules are that you need to show your work before you get help. What have you attempted with this problem, and where are you stuck?

 

[ravenprp]

Hello,

I understand that you are having trouble with a liquid-liquid extraction problem and have been working on it for two days without success. I will try my best to help you with this.

From what I understand, you have two components A and B with very similar boiling points, and you want to separate them using a solvent C through liquid-liquid extraction. The goal is to obtain an 82% A and 17% B extract (solvent-free basis) and a 10% A and 90% B refined product (solvent-free basis). The feed you are working with is 35% A and 65% B (solvent-free) and is saturated.

To calculate the minimum quantity of extract you need to return and the refined quantity to obtain the desired percentages, you will need to use the mass balance equation:

F = E + R

Where F is the feed, E is the extract, and R is the refined product. You can also use the solvent-free basis equation to determine the quantities:

F = E + R + S

Where S is the solvent.

To calculate the ideal number of stages needed on both sides of the feed, you will need to use the McCabe-Thiele method. This method uses the reflux ratio (kg of extract with solvent/kg of extract product) to determine the number of stages needed for separation. The reflux ratio in this case is double the minimum value, so you will need to use that value in your calculations.

I am not sure what you mean by "do on equilateral triangle, rectangle triangle, and solvent-free coordinate graph." Can you please clarify what you need help with in regards to these shapes and graphs?

I hope this information helps you solve your problem. If you need further clarification or assistance, please let me know. Best of luck!