At what feed condition the slope of q line is infinity?
Explanation: At saturated liquid the enthalpy of feed and the liquid is same so q=1 and slope = infinity.
Find the feed condition from the below distribution curve.
Explanation: Since the slope of the qline is between 1 and 0 it is a superheated vapour.
In an operation the slope of the qline is found to be 0; then the enthalpy of feed equals enthalpy of _____________
Explanation: Slope of q line = q/q1
If the enthalpy of feed and vapour are equal then the q becomes zero; q line also becomes zero.
Consider a saturated liquidvapour mixture, if the liquid flow rate inside the enriching and the stripping section of a fractionator is 50 and 40 mol/hr. Also the feed rate is 10 mol/hr. Find the feed condition.
Explanation: q= 5040/10 = 1; then the feed condition is a saturated liquid.
Find the liquid vapour compositions.
Explanation: From the feed condition we can estimate that the feed has a mixture of liquid and vapour. From the distribution diagram, the vapour composition is 60% and the liquid composition is 40%.
At what feed condition the slope of the flash vaporization line becomes 0?
Explanation: For a saturated vapour, the enthalpy of feed and the enthalpy of vapour is same so the value of q= 0; slope of qline is 0.
The point where the operating line and the equilibrium line meets in distillation methods is known as
Explanation: At the pinch point, separation is not possible since it requires infinite number of trays in the enriching section if operating and equilibrium line meets.
Find the exact q line for the saturated liquid from the distribution diagram,
Explanation: For the saturated liquid, slope of qline should be infinity.
The equilibrium composition of liquid and vapour in a feed can be identified by,
Explanation: If the value of q is between 0 and 1 then the feed has both vapour and liquid. Then the compositions can be identified by intersecting qline with operating line.
If the feed enters the distillation column at its dew point, then the slope of the Flash vaporization operating line is
Explanation: If the feed at dew point means the feed condition is saturated vapour so the enthalpy of feed is same as the enthalpy of the vapour. Therefore the slope of the Qline is 0. Since Qline is the Flash vaporization operating line.
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