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 q-line is between 1 and 0 it is a superheated vapour.
In an operation the slope of the q-line is found to be 0; then the enthalpy of feed equals enthalpy of _____________
Explanation: Slope of q line = q/q-1
If the enthalpy of feed and vapour are equal then the q becomes zero; q line also becomes zero.
Consider a saturated liquid-vapour 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= 50-40/10 = 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 q-line 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 q-line 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 q-line 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 Q-line is 0. Since Q-line is the Flash vaporization operating line.