Test: Design Of Fractionator With Thiele Method - Chemical Engineering MCQ

Explanation: When the Enriching section operating line intercept at origin then the operating line will become the diagonal line (45 degree line) that means all the condenser product are refluxed( No distillate). i.e. Reflux ratio =(R/D) if D=0 then reflux ratio tends to infinity that gives minimum number of trays for designing the distillation column.

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.

Explanation: Because if there is no reflux stream to the continuous distillation column then the entire vapour product after condensed from the condenser becomes a distillate but practically it is no possible but as per the theory in order to get all the vapour as distillate the condenser must be so large which is economically cost more.

Explanation: Since the latent heats are alone removed by the condenser so the concentration of liquid entering the condenser and the concentration leaving the condenser are same.

Explanation: Ponchon-Savarit method alone includes enthalpy concentration data.

Explanation: According to McCabe’s assumptions only equimolal flow rates of both liquid and gas are maintained.

Explanation: According to the assumptions of McCabe-Thiele method the heat losses are avoided.

Explanation: Since the slope obtained from the derivation for McCabe method is R/R+1.

Explanation: Slope =R/R+1 = 2/3 = 0.67

Explanation: It is necessary to include condenser or reboiler since the separation may occurs in such locations.