PT225 Distillation Test 1 Midterm Test Questions with Correct Answers Graded A+

PT225 Distillation Test 1 Midterm Test Questions with Correct Answers Graded A+ Name 4 *basic systems* in a *distillation tower *system*?F.T.B.O. - Answers 1 *f*eed system 2 *t*ower 3 *b*ottoms system 4 *o*verhead system Where is *flash vaporization* found? - Answers Its found in the feed tray and flash zone Name and describe the 4 basic parts of a *feed system*?F.F.F.BF. - Answers Feed tank- a storage for raw materials to be fed to tower Feed pump - moves liquid feed stock from the storage tank thru the preheater to the tower. Bottoms/feed exchanger - recovers heat from the bottoms product to preheat the feed Feed preheater - a HEX that brings the feed stock up to the boiling point. Name and describe the basic parts of a *overhead system*?C.A.P.O. - Answers Condenser - HEX that condenses the vapor coming off the top of the tower back to a liquid Accumulator - a vessel that collects the overhead liquid Overhead pump- pumps portions of the liquid back to the top of the tower. Product tank- a storage for overhead product Name and describe the 5 basic parts of a *bottoms system*?B4R - Answers Reboiler- boils the liquid in a HEX. Vapors from the top of the HEX re-enter the tower and add heat back to tower. Bottoms pump- pump the heavier bottoms to storage or further processing Bottoms /feed HEX- recovers heat from the bottoms product to preheat the feed Bottoms tank- a storage for bottoms product Bottoms product cooler- used to further cool the bottoms product before going on to storage. Name and describe *5* types of *reboilers*. - Answers 1 horizontal 2 kettle 3 stab-in 4 natural circulation thermo syphon 5 forced circulation thermo syphon In a distillation tower what happens to the feed when it *enters the tower*? - Answers The feed enters the tower at the* average boiling range*of the mixture What are *3 types* of *trays*? - Answers 1 *b*ubble cap tray 2 *s*ieve tray 3 *v*alve tray What is the *purpose of a weir* located on each tray? - Answers To maintain a level covering the tray What is the *purpose* of a *downcomer*? - Answers Directs liquid down to the next tray so it doesn't interfere w rising vapors What is *latent heat*? - Answers Heat that causes a phase change. Can't be sensed by a change in temperature. What is *sensible heat*? - Answers Heat that can be sensed by a change in temperature What is *distillation*? - Answers The separation of components in a mixture by their boiling points a *stream trap*? - Answers On the outlet of HEX. Uses steam as a heating medium. Used to separate steam and condensate. What can be used to perform the *same function* as *trays*? - Answers Packed towers or tower packing.