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In a continuous distillation of a mixture of 40% A and 60% B
with a flow rate of 10,000 kmol / hour, the volatile component
composition is decomposed to 90% in distillate and 4% in boiler.
Feeding is ¼ steam, ¾ liquid and partial condenser is used in the
system.
a) Minimum ideal number of steps,
b) Minimum riflax rate,
c) Ideal stage number when the actual riflax ratio is 4.5 times the
minimum value
d) Enrichment and peeling regions liquid and vapor flow rates (L,
V, ?̅, ?̅),
e) If the average efficiency of the column is 0.5, the number of
real steps,
f) Find the actual number of steps when n kad = 0.65
x | 0 | 0.05 | 0.15 | 0.30 | 0.50 | 0.70 | 0.88 |
y | 0 | 0.40 | 0.60 | 0.70 | 0.75 | 0.80 | 0.90 |
The required material balances are applied on the system.
The McCabe thiele diagram is used for the calculations of ideal number of stages (minimum number of stages and the actual number).
The procedure and required calculations are provided below.