PT225- DISTILLATION TEST 2 STUDY GUIDE EXAM QUESTIONS AND ANSWERS GRADED A+ 2025/2026

PT225- DISTILLATION TEST 2 STUDY
GUIDE EXAM QUESTIONS AND
ANSWERS GRADED A+ 2025/2026




Name 3 things that can happen if the boil-up rate is too high. - ANS -vapor flooding

-low liquid level

-increase in delta P and delta T



Name 3 things that can happen if the reflux rate is too high. - ANS -flooding

-contamination of bottoms product

-reflux will block the rising vapors



What is flooding? - ANS excessive liquid flowing down a column blocks vapor flow up the
column



Name 2 methods uses to air-free a system. - ANS -water fill the tower and drain by using
nitrogen to displace water

-purge the system with nitrogen at constant pressure and flow rate



What are 2 causes of overhead condenser failure? - ANS -loss of CTW

-scale or fouling preventing heat transfer

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, What is puking? - ANS the eruption of vapors and liquids out of the top of tower



What are 2 major factors that affect tower operation? - ANS Temp. and Pressure



What are the critical temperature points in a tower? - ANS -feed point

-reboiler

-side-draw off tower

-top of tower

-bottom of tower



What should the temperature be at the top of the tower? - ANS the boiling point of the
desired OH product



List 2 scenarios for distillation startups. - ANS -After tower has been down for a short period
of time

-After tower has been down for several days or weeks



List 3 types of distillation shutdowns. - ANS -short term

-long term

-emergency



What is normally used to air-free a system? - ANS nitrogen



Name 3 gas tests that you would perform to ensure the equipment is gas or hydrocarbon free. -
ANS -oxygen


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