How many degrees is the liquid subcooled in the condenser? Therefore, the liquid must be subcooled to at least 97 degrees to prevent liquid line flash gas. This means the system would need at least 8 degrees (105 degrees - 97 degrees) of condenser subcooling to prevent liquid line flashing before getting the metering device.

For example, when a subcooled liquid with mole fraction of A=0.4 (point A) is about the condition of the feed mixture, then we can construct the q-line 

Step 6: Draw the line with slope 0.5 which is the rectifying section OL. Step 7. Draw the stripping section operating line from the Bottoms composition to the intersection of the rectifying section OL and the q-line. y drawing a x Solution: Step 1: From x D locate x 1 and y 1 horizontal line to the equilibrium condition for stage 1. Step 2

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Distillation Column ‼️q-Line‼️ The Feed Line (q-line) The parameter q is the mole fraction of liquid in the feed and the slope of the q-line is q / (q.

Equation 7 is the equation of the operating line for the stripping section. The feed type is characterized by using a factor q, defined as the number of moles of liquid flow in the stripping

Step 6: Draw the line with slope 0.5 which is the rectifying section OL. Step 7. Draw the stripping section operating line from the Bottoms composition to the intersection of the rectifying section OL and the q-line. y drawing a x Solution: Step 1: From x D locate x 1 and y 1 horizontal line to the equilibrium condition for stage 1. Step 2

Slope of the q-line is: Answer (a) V/F denotes the vapor fraction, hence the liquid fraction is=(1-0.37)=0.63 Slope of q-line: Feed is 50% ethanol and is a subcooled liquid. One mole of vapor must be condensed to heat 12 moles of feed to their boiling point. f. Feed is 20% ethanol, and 70% is vaporized in a flash distillation system.

These limits are derived when the feed is either a superheated vapor or a subcooled liquid (when the enriching section operating line coincides \\·ith the diagonal line on the x -y diagram). 3. Some conceptual errors will appear in the deri,·at.ion of q-line.

The q-line (depicted in blue in Figure 1) starts at the x = y line and intersects the starting point of the rectifying section operating line. The parameter q is the mole fraction of liquid in the feed,

If the feed is a vapor— liquid mixture, q is a fraction. Values of q greater than 1 indicate subcooled liquid feed. Values of q less than 0 indicate superheated vapor feed. Now let us look at the intersection points (x„ y,) of the stripping and rectifying operating lines. Use of equations (2.28) and (2.30) gives: