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#READING A TERNARY DIAGRAM WITH PHASE SEPARATION HOW TO#

On a fresh copy of the phase diagram, label points, , and.

Draw a line from to F and extend to the other side of the equilibrium curve.

Extend the upper-most tie-line in a line that connects with the line connecting points ( and ).

Locate points and on the phase diagram.

is the intersection of the line connecting points (, ) and the line that is an extension of the upper-most equilibrium tie-line.ĭetermining minimum feasible solvent mass ratio ( ) when (1) feed composition (2) incoming solvent composition and (3) outgoing raffinate composition have been specified/selected. = Point associated with the minimum feasible for this feed, solvent and (raffinate or extract) composition. = Mass fraction of species in the extract leaving stage

= Minimum feasible mass ratio to achieve the desired separation, assuming the use of an infinite number of stages. Every pair of passing streams must be connected by a straight line that passes through. Points ( and ) and ( and ) are connected by a straight line passing through. This is where the fresh solvent enters the system and the final raffinate leaves the system. Hunter Nash Method for Finding Smin, Tank Sizing and Power Consumption for Mixer-Settler Units Staged LLE: Hunter-Nash Method for Finding the Minimum Solvent to Feed Ratio Hunter Nash Method 2: Number of Stages (6:30).Hunter Nash Method 1: Mixing and Operating Points (9:30).

#READING A TERNARY DIAGRAM WITH PHASE SEPARATION HOW TO#

Watch this two-part series of videos from LearnChemE that shows how to use the Hunter Nash method to find the number of equilibrium stages required for a liquid-liquid extraction process. – Continue in this manner until the extract composition has reached or passed. Connect to operating point with a straight line, mark the location of. Connect point to operating point with a straight line, mark the location of.

Determine the number of equilibrium stages required to achieve the desired separation with the selected solvent mass.

Note the intersection of these two lines and label as “ ”.

On a fresh copy of the graph, with plenty of blank space on each side of the diagram, note the location of points, , and (specified/selected) and (determined in step 3).

Draw a straight line from to and extend to find the location of on the equilibrium curve.

Locate point on the ternary phase diagram.

Use this composition to locate point along the straight line connection points and.

Do a material balance to find the composition of one species in the overall mixture.

Locate points and on the ternary phase diagram.

= Mass fraction of species in the extract leaving stage Process schematic for multistage liquid-liquid extraction.ĭetermining number of stages when (1) feed rate (2) feed composition (3) incoming solvent rate (4) incoming solvent composition and (5) outgoing raffinate composition have been specified/selected. = Mass fraction of species in the raffinate leaving stage

This could refer to the mass of the stream or the composition of the stream. is expected to be located outside of the ternary phase diagram. Every pair of passing streams must be connected by a straight line that passes through point. is determined by the intersection of the straight line connecting points (, ) and the straight line connecting points (, ). will be located within the ternary phase diagram. Points ( and ) and ( and ) must be connected by a straight line that passes through point. = Composition of the mixture representing the overall system. This is where the fresh solvent S enters the system and the final raffinate leaves the system. 3 Liquid-liquid Extraction Staged Liquid-Liquid Extraction and Hunter Nash Method