Shortcut Methods Flashcards
(12 cards)
What is the Fenske equation used for?
The Fenske equation is used to calculate the minimum number of theoretical plates required for a distillation process.
True or False: The Underwood equation provides a method to calculate the composition of distillate and bottoms in a distillation column.
True
Fill in the blank: The Gilliland correlation is used to estimate the ________ of a distillation column.
height of packing
What is the primary purpose of the Erbar-Maddox method?
The Erbar-Maddox method is used to estimate the number of stages in a distillation column when the feed composition is known.
Which method incorporates the Kirkbride equation?
The Kirkbride equation is incorporated in the design of distillation columns to relate the number of stages to reflux ratio.
Multiple Choice: Which of the following methods is NOT a shortcut method for distillation calculations? A) Fenske B) Underwood C) Raoult D) Gilliland
C) Raoult
What is the significance of the reflux ratio in the context of the Underwood equation?
The reflux ratio is essential for determining the optimal separation efficiency and influences the required number of stages.
Short Answer: Describe the relationship between the Fenske equation and the concept of minimum reflux.
The Fenske equation assumes minimum reflux conditions to determine the theoretical plates needed for a given separation.
True or False: The Gilliland correlation can be used for both packed and tray columns.
True
What is the main limitation of using shortcut methods like Fenske and Underwood?
The main limitation is that they assume ideal conditions and may not accurately represent real-world complexities in distillation processes.
Fenske equation?
N m = log [ (x LK /x HK) d (x HK / x LK) b ] / [ log ( α LK av / α HK ave) ]
