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Characterizing The Beer Column Exam 100% Verified
How are trays numbered in a distillation column - ANSWER Top to Bottom What tray is usually the feed tray - ANSWER Tray 4 How many trays does a distillation column usually have - ANSWER 18 ____________ behaves differently than _____________. -below the feed ANSWER Above the feed and
Above the feed. -true if using volume aka gal/min, so we use mol/s) ANSWER All vapor and liquid flows above the feed are the same (not
On each tray. -equilibrium ANSWER the liquid leaving the tray and the vapor leaving the tray are in
At the top of the column.we can relate compositions leaving the tray by: - phase equilibriumANSWER phase equilibrium since the vapor and liquid leaving the same tray are in At the top of the column.we can relate compositions between trays by: - ANSWER mass balances Slope of operating line - ANSWER R / (R + 1)
The operating line. - ANSWER Relates compositions between the trays above the feed Does the liquid composition change as it moves down between trays? - ANSWER Yes How do you determine the vapor composition traveling between 2 trays? -dropping a line down at constant liquid concentration until we hit our operating line ANSWER By
What is an easy way to calculate the composition of the liquid and vapor coming off acolumn without having to write out a million material balances? - ANSWER Stepping off trays! Low reflux - ANSWER Less separation High reflux - ANSWER More separation ________ reflux __________ separation - ANSWER more, improves _________ reflux means ____________ which means _____________ -trays, shorter columns ANSWER more, fewer
The equilibrium limit - ANSWER x = y line, can't create a better separation than this Given a column, operation at total reflux will give us the best possible separation. Butwhat does this mean about how the column is operating? - ANSWER Operating at total reflux means that all the material is continuously recycled within the column and nodistillate or bottoms products are removed.
Flow up the column is _________ and _________ the vapor flowrate into the beer heater. -ANSWER constant, the same as
