LEACHING Flashcards
Equilibrium in Leaching
Y1=X1
If constant solution retention; x/y is
Msolute/Msolution (Mass Fraction)
If constant solvent retention; x/y is
Msolute/Msolvent (Mass ratio)
In Leaching solute + solvent or solution is also called
LIQUID
Tiller-Tour Equation
N-1 = (log(x1 - y2)/(xn - yn+1)/(log(x1 - xn)/(y2 - yn+1))
Y2 in the Tiller-Tour Equation
L/V (x1 - xn) + yn+1
N actual is equal to
N theo/efficiency (n)
N (number of stages) can also be calculated by
N = log(1 + (R -1)/f)/ logR
R in the calculation of stages is; while f is
R = Solvent (feed)/ Solvent (underflow);
f = Msolute (underflow)/ Solute (feed)
f = 1 - recovery
A unit operation in which a soluble component is removed from
an inert solid by a solvent which preferentially dissolves the
soluble matter is known as
LEACHING
The unit operation by which soluble components of a liquid
mixture are dissolved in a liquid immiscible with the insoluble
component is
SOLVENT EXTRACTION (LLE)
Tea percolation employs
LEACHING
Which of the following is the most commonly used leaching
solvent in vegetable oil industry?
HEXANE
Leaching of sugar from sugar beets is done using
a. hot water c. dilute H2SO4
b. hexane d. lime water
HOT WATER
In a counter-current extractor, as the axial mixing increases, the
extraction efficiency
a. increases
b. decreases
c. remains unchanged
d. depends on the pressure of the system\
DECREASES
