Practice midterm Quiz_ CHE311H1 S LEC0101 20211_Separation Processes 2

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CHE311H1 S LEC0101 Quizzes Prac ! ce midterm Quiz ! Prac ! ce midterm Quiz Due Feb 25 at 11:59pm Points 100 Ques ! ons 4 Available Feb 17 at 11:59pm - Feb 25 at 11:59pm 8 days Time Limit 110 Minutes Allowed A " empts Unlimited Instruc ! ons A " empt History A " empt Time Score LATEST A " empt 1 109 minutes 12 out of 100 Submi " ed Feb 24 at 11:41am UNIVERSITY OF TORONTO FACULTY OF APPLIED SCIENCE AND ENGINEERING Midterm February 26, 12:10 pm EST 2021 Third Year – Department of Chemical Engineering and Applied Chemistry CHE311S – Separa ! on Processes Examiner – Edgar J. Acosta. (The examiner will be present in the BbCollaborate Session - clarifica ! on ques ! ons can be asked via the chat func ! on in BbCollaborate) Due date: 2:00 pm EST February 26, 2021. By taking this quiz you are pledging that you will not violate our Faculty’s Code of Behaviour on Academic Ma " ers during this assessment by ac ! ng in any way that would cons ! tute chea ! ng, misrepresenta ! on, or unfairness, including but not limited to, using unauthorised aids and assistance, impersona ! ng another person, and commi # ng plagiarism. By taking this quiz you are also acknowledging that providing unauthorised assistance to someone else is also considered a serious academic o ff ence. In this final assessment: Authorised aids include : your course notes, textbooks, research ar ! cles, slide sets provided in the course, video recording of lectures from the course, web-based ar ! cles, use of Excel spreadsheets, and Microso # Word (your own). Unauthorised aids include, but not limited to : course notes, wri " en material, video, spreadsheets or so # ware generated by others (not included in the list of authorised aids). ***PLEASE BE CAREFUL BECAUSE THERE IS ONLY ONE ATTEMPT FOR THE QUIZ, SO DO NOT SUBMIT UNTIL YOU FINISH*** *** PLEASE REMEMBER THAT YOU MUST SUBMIT YOUR EXCEL SHEET OR PICTURES OF HAND CALCULATIONS THROUGH THE FINAL ASSESSMENT SUBMISSION ITEM - THE ANSWER TO THE QUESTIONS ARE THOSE SUBMITTED VIA THIS QUIZ - THE SUBMISSION ITEM IS FOR YOU TO SHOW YOUR CALCULATIONS IN SUPPORT OF THE QUIZ ANSWERS *** GOOD LUCK Take the Quiz Again Answer 1: Answer 2: Answer 3: Answer 4: Answer 5: 8 / 20 pts Ques ! on 1 Ammonia absorp ! on refrigera ! on is one method of refrigera ! on that uses substan ! ally less electricity than conven ! onal compression refrigera ! on cycles. The process uses two flash processes, one flash separator at high pressure (the generator), and one flash absorber (the reverse of separa ! on) at low pressure. For the low pressure flash absorber, a liquid solu ! on of 40 mol% of ammonia in water (S8) is set in contact with 0.1 mol/s of pure ammonia gas (S1) to produce a concentrated solu ! on at its bubble point at 30C and 3 bar (S2). This concentrated liquid solu ! on is then pumped to 12 bar (S3), and then heated to a high enough temperature (S4) such that the generator produces the 40 mol% ammonia solu ! on as saturated liquid (S6), and a concentrated ammonia gas (S5) at high pressure (12 bar). The Antoine equa ! ons [ log(P,bar)= A-B/(T,Kelvin+C) ] for water and ammonia are: component A B C ammonia 4.86886 1113.928 -10.409 water 4.6543 1435.264 -64.848 The Henry's constant for Ammonia is H = 1 bar. Based on this informa ! on, the Margules 1-parameter for Ammonia-water is: +3.4 (introduce the value with its sign and one decimal, for example, +3.4) A # er genera ! ng the TXY diagram for ammonia-water at 3 bar, the mol% ammonia in S2 is 46 (introduce the number without decimal, for example, if your calcula ! on lead to 62.3 mol%, you would enter 62). The molar flow (in mol/s) of the 40 mol% ammonia solu ! on (S8) required to absorb 0.1 mol/s of pure ammonia gas (S1) is 0.89 (introduce the number with two decimals, for example, if your calcula ! on led to 1.8564, you would enter 1.86) A # er genera ! ng the TXY diagram for ammonia-water at 12 bar, the temperature (in Celsius) of the flash-generator required to produce a 40 mol% saturated liquid ammonia at 12 bar (S6) is 102 (introduce this number without decimal). The composi ! on (in mol%) of the ammonia vapour (S5) generated from the generator flash is 96 (introduce the number without decimal, for example, if you obtained 89.58%, you would enter 90). +3.4 You Answered You Answered -2.3 Correct Answer Correct Answer -2.2 Correct Answer Correct Answer -2.4 Correct Answer Correct Answer 46 You Answered You Answered 48 Correct Answer Correct Answer 47 Correct Answer Correct Answer 49 Correct Answer Correct Answer 0.89 You Answered You Answered 0.65 Correct Answer Correct Answer 0.64 Correct Answer Correct Answer 0.63 Correct Answer Correct Answer 102 Correct! Correct! 103 Correct Answer Correct Answer 104 Correct Answer Correct Answer 96 Correct! Correct! 97 Correct Answer Correct Answer 95 Correct Answer Correct Answer Answer 1: Answer 2: Answer 3: Answer 4: Answer 5: Answer 6: Answer 7: Answer 8: Answer 9: Answer 10: 4 / 40 pts Ques ! on 2 The X-Y diagram below corresponds to a binary mixture of MC1 (mystery component 1) and water. This mixture forms an azeotrope. At the temperature of the azeotrope and 1 bar of total pressure, the vapour pressure of MC1 and water are 0.89 bar and 0.53 bar, respec ! vely. Based on this informa ! on, and using the Margules 2-parameters, then the value of A12 = -0.1 (enter the value with one decimal, and sign, for example, +1.2). The feed to the dis ! lla ! on column is F=10 mol/s saturated vapour with z1= 0.4. Your final design should accomplish x1_top=0.78, and x1_bo " om=0.1. For this separa ! on, determine: The minimum reflux ra ! o = 4.6 (enter the value with one decimal) The minimum number of equilibrium trays = 7 (enter the value as an integer) Considering the opera ! onal reflux ra ! o as 1.5*Rmin, then the molar flow in mol/s of the vapour in the top is 348.8 (enter the value with one decimal) Considering that the overall e ﬃ ciency of the trays is 0.75, then the total number of actual trays = 9 (enter the value as an integer) The feed tray (actual, not equilibrium) is = 4 (enter the value as an integer) Considering a molar volume of the vapour in the top as 0.03 m^3/mol, the density of the gas as 0.002 g/ml and the density of the liquid as 0.8 g/ml, a tray spacing of 0.6 m, then the recommended superficial velocity of the gas (in m/s) is = 0.9 m/s (enter the value with one decimal), and the column diameter (in meters) is = 3.8 (enter the value with one decimal). The total height of the column in meters is = 7.5 (enter the value with one decimal) Assuming that you are using a 1-pass tray, then weir loading (in m^3/min-m), considering a molar volume of the liquid of 67mL/mol, is = 0.16 (enter the value with two decimals) -0.1 Correct! Correct! -0.2 Correct Answer Correct Answer -0.3 Correct Answer Correct Answer 4.6 You Answered You Answered 1.98 Correct Answer Correct Answer 1.99 Correct Answer Correct Answer 2 Correct Answer Correct Answer 7 You Answered You Answered 4 Correct Answer Correct Answer 348.8 You Answered You Answered 12.6 Correct Answer Correct Answer 12.7 Correct Answer Correct Answer 12.5 Correct Answer Correct Answer 9 You Answered You Answered 8 Correct Answer Correct Answer 4 You Answered You Answered 5 Correct Answer Correct Answer 0.9 You Answered You Answered 1.1 Correct Answer Correct Answer 1.2 Correct Answer Correct Answer 1.0 Correct Answer Correct Answer 3.8 You Answered You Answered 0.7 Correct Answer Correct Answer 0.8 Correct Answer Correct Answer 7.5 You Answered You Answered 7.2 Correct Answer Correct Answer 7.1 Correct Answer Correct Answer 7.3 Correct Answer Correct Answer 0.16 You Answered You Answered 0.09 Correct Answer Correct Answer 0.08 Correct Answer Correct Answer 0.1 Correct Answer Correct Answer Answer 1: Answer 2: Answer 3: Answer 4: Answer 5: Answer 6: Answer 7: Answer 8: Answer 9: Answer 10: 0 / 30 pts Ques ! on 3 Unanswered Unanswered The table below includes the composi ! on of the feed to a mul ! component dis ! lla ! on tower, including the frac ! on recovered through the dis ! llate stream. The feed flowrate is 100 mol/s. Component Zi A B C % recovery in dis ! llate propane(C3) 0.1 4.53678 1149.36 24.906 butane(C4) 0.15 4.35576 1175.581 -2.071 pentane(C5) 0.2 3.9892 1070.617 -40.454 hexane(C6) 0.25 4.00266 1171.53 -48.784 99 heptane (C7) 0.3 4.02832 1268.636 -56.199 1 Given the op ! ons for the pressure of the column: 1 bar, 3 bar, 5 bar, 7 bar, 9 bar and 11 bar, the pressure you select is bar. At this pressure, the temperature in the condenser in Celsius is (enter the value without decimal), and the temperature of the reboiler is (enter the value without decimal. The LK/HK average rela ! ve vola ! lity is (enter the value with one decimal point) Considering that Ropera ! onal = 1.5*Rmin, the the reflux ra ! o is (enter the value with one decimal point) Considering an overall tray e ﬃ ciency of 75%, the number of actual trays in the stripping sec ! on of the column is and in the rec ! fying sec ! on are . Considering an inter-tray spacing of 0.5m, the diameter of the dis ! lla ! on column in meters is (enter the value with one decimal) The height of the column in meters is (enter the value with one decimal) The number of passes in the tray is (You le # this blank) You Answered You Answered 5 Correct Answer Correct Answer (You le # this blank) You Answered You Answered 57 Correct Answer Correct Answer 56 Correct Answer Correct Answer 58 Correct Answer Correct Answer (You le # this blank) You Answered You Answered 163 Correct Answer Correct Answer 164 Correct Answer Correct Answer 162 Correct Answer Correct Answer (You le # this blank) You Answered You Answered 2.3 Correct Answer Correct Answer 2.4 Correct Answer Correct Answer (You le # this blank) You Answered You Answered 1.5 Correct Answer Correct Answer 1.6 Correct Answer Correct Answer (You le # this blank) You Answered You Answered 14 Correct Answer Correct Answer (You le # this blank) You Answered You Answered 16 Correct Answer Correct Answer (You le # this blank) You Answered You Answered 1.9 Correct Answer Correct Answer 2 Correct Answer Correct Answer (You le # this blank) You Answered You Answered 17.5 Correct Answer Correct Answer 17.4 Correct Answer Correct Answer 17.3 Correct Answer Correct Answer (You le # this blank) You Answered You Answered 1 Correct Answer Correct Answer 0 / 10 pts Ques ! on 4 Select the true statements below When one deals with very li " le liquid loading in the tray, one should use am orifice tray When one feeds at q=1, the heat of the reboiler tends to be greater than if q=0. Correct Answer Correct Answer The McCabe-Thiele method is a simplifica ! on, a more rigorous method would consider the energy balance in each tray to obtain L/V per tray Correct! Correct! When the Margules parameter is nega ! ve, it means that there is a net repulsion between the species You Answered You Answered A column that usually dis ! ls an aqueous solu ! on of 10 mol% ethanol suddenly is fed with a 5 mol% solu ! on. Under this circumstances you would expect that the duty of the reboiler will increase to maintain the target separa ! on. Correct Answer Correct Answer " Previous Next # Last A " empt Details: Time: 109 minutes Current Score: 12 out of 100 Kept Score: 12 out of 100 Unlimited A " empts Take the Quiz Again (Will keep the highest of all your scores) 2021 Winter Home Announcements Grades Modules Bb Collaborate Quizzes Assignments Discussions 1-2.3/48 -0.66 X. 0.4+0.1 - = 0.48 X + O - l - Iv slope =L reflux ratio → infinite All the V goes back as L • I Yf - YT = ¥ )T= ¥ tl - T Xf - XT ④ Xf - -0.2 0.78 = 0.4 04%8 Sf or - 1=0.655 Xf - - o - Z • 0.65512+0.655=12 Yf - -0.4 0-34512=0.655 9 R= ' optimal R : 2.85 2.85+1=0.74 = 0.4 - 0.7g ⾨ ) ,_=2 Xf - 0.78 Xf -0.78=-0.51 Xf = 0.27 um um um g. 9 4 - Dt DR ✓ 16.9 ✓ 6 - " s=o ¥ s=4 → feed at trays - urn urn W - Iv - - to .ME -10.274 -0.475L Rj 's 1.067 T - 0.6 0.78 7.2 De - 0.6 × (8-1) -11.2+1.8=7.2 un / j 0.086 LK HK 5 ⊥ Tbubble > 55°C aircooter 58 164 2.4 1. b un 14 bottom um top . ÷ ÷ p x low flow rate seive we can liquid fee ) Whr call vapour feed ) G- attractive more bottom flow

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