{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Test%202%20solution,2005

# Test%202%20solution,2005 - CHE 4473(Kinetics Test#2 Name...

This preview shows pages 1–6. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: CHE 4473 (Kinetics) Test #2, 11/8/05 Name Instructions: Work all problems, stating any assumptions. OU Honor Council Integrity Pledge: On my honor, I aﬁ‘irm that I have neither given nor received L inappropriate aid in the completion of this exercise. Signed: 45 pt. 24 a t, b )5 c Date: 1. An ideal PFR is being used to carry out a liquid phase, irreversible endothermic reaction. Hot water out, Ta(z = 0) T Reactant in, 60 “C Product out __...___, —_____* z = 0 Hot later in, Ta(z = L) The reactor tube has a diameter of 4 cm. Heating ﬂuid in the shell around the reactor tube ﬂows countercurrently with the reactant, as shown in the diagram. A + B 9 products r = kCACB AHr = 3 x 105 kJ/kmol A The reaction rate coefficient k = 6.6 m3/(kmol-min) at 60 C. The feed concentrations of A and B are 2.0 kmolr’m3 and 1.0 kmolim3, respectively. The total feed volumetric ﬂow rate is 1.4 m3/min. The heat capacity and density of the reactant/product are constant and equal to 4 kJ/(kg-K) and 900 kg/mB, respectively. The heat transfer coefficient between the reaction mixture and heating ﬂuid is 400 kJ/(min-mZ-K). The heating ﬂuid ﬂow rate is 0.5 m3/min, its density is 1000 kg/m3 and its heat capacity is 4.2 kJ/(kg-K). Determine the heating ﬂuid outlet temperature Ta(z = 0) such that, at z = 0, dT/dz = 0 for the reactant. In the graph below, sketch the expected profile of T (reactor contents) versus 2, being as accurate as possible (no calculations necessary). If 50% conversion of B is achieved in the reactor and the heating ﬂuid temperature change is 34 C -— i.e., Ta(z = L) — Ta(z = 0) = 34 , determine the product temperature (i.e., the temperature T at the reactor tube exit). 30 pt. 2. Two exothermic, liquid phase reactions occur in an adiabatic CSTR: L A + B -) C rAl = leACB AH” = —20 kcal/gmol A A + 1/2c —> D I'Az = kgCACCUZ AHr2 = -5 kcal/gmol A The feed conditions are CA0 = C30 = 4 M, To = 50 °C, residence time = 4 min. The heat capacity and density of the reactor contents are given by pCp = 1 kcal/(liter °C) It is found that under these conditions, rm = 0.7 gmollﬂiter min) and I'A2 = 0.25 gmol/(liter min) . 2.2. a. Determine the reactor operating temperature T. 9/ b. Determine C A and C3 in the reactor. b 25 pt 3. In a jacketed, 1 m3 CSTR, an exothermic reaction and an endothermic reaction occur in the liquid phase. The reactions are A 9 B with -r1A = 1(ch and AH = +2 x 106 kJ/kmol A 2A ~> C with —r2A = kch1 and AH = -1.5 x 106 kJ/kmol c The reaction rate coefficients are: 3 k1 = 2 x 1013exp(—10,000/T) min-1 and k2 = 6 x 1010exp(—8,000/T) k—mﬂm with T in Kelvins. The feed concentration of A is 1.5 kmollm3; feed concentrations of B and C are 0. The feed and reactor temperatures are 50°C, with a feed volumetric ﬂow rate of 2.5 m3/min. Under these conditions, the conversion of A is 50%. 1% a. Is heat being removed from or added to the reactor? Determine the rate of heat transfer Q. 3 b. If higher conversion than is achieved at 50°C is desired for the same feed conditions and reactor volume, will the reactor operating temperature need to be increased or decreased? '+ c. Will the selectivity to B be increased or decreased at the higher conversion obtained in (b)? BE SURE TO EXPLAIN YOUR ANSWERS. . t :ll _ .. -. . . Mi, mild-JinHl'ﬂun .n}: ,-i .1 i > ,.. ifJaime-Marin»Jew,p awe tum Tam-#2. Snlu'ﬁtm V? 11/3/1005 A) EN 1%- FEES Th Wax-Edam“ «e. LL95?“ 33 :7) ugcTa-Tgmu [egg-,1 a. _ . -1 B) 9%} "Q ”9-7.. Imlgjj Lhodib fyvx IIf/XM'EH \ao-QA-«cecl b77913. hr :39") A-s E Mme-43.4.3; Mix-25m Meme: (.-.... m“ “7* :11“ 6.1%., 7;... mwaeaee ) prohdﬂy —-— WW pgmrgg-e -..- .. a) 50% WMIWG'E BI III\$ ”‘1'?QO him J\)I\mc'hcm~¢ Ee.~)€g.:-®Hr)=_ 0+me )I(9Is)(3uo‘ kT/MiL :uno II /'mm I ‘ b 77797929 7",:7:: JESQ: +\g;é-mrem--WMAT .____.---_..-__ 9 LT 57- : 17”; mimrﬂilium haw 1271mm MEMMHM Illié Ma 7 | D‘HWCR JA- I3: 5105 ‘FT AMA} =) Vi . qu x "35 £- :QVE CP\ AT) VM’E-uf- WW . . ...._--,...-..... ._..._.-._.. .. F . m 3—3: 5193 )(I-A EDQT)” '1 =5 LT‘ —rrs_; — .-.___ 50 2:10 31,5 T6111" _ . ._ ...____i ..-OL.). vw-AM mris’h‘m a": \vx‘tzw’rJ r r075ﬁ:_ ”a? ’0‘1‘5 QMRUA ' E“! .. .1 . 4:4. 9d: 5.0..C__3...\$Q_ W W), .bque’LkalA kL\‘_F’§.. LEHML’EL:_LH__.M J .- E5. Wan-5:0 ‘07.-_A.0.o~0'g:ms ,3." _‘T. ’ AT "‘ i 1‘ bdmw (WV‘K 2_ MOE-Chm; _- ..M9LLL:‘!§3. L05. _ 1%.; _. .. 0 (005-5152)-.. - 0124- .51.20: ccTT1JCAAﬂgA11A.u.£J\/_ A1 A 0AM"....._'_.-_AA:£_A. 01+ (am-1.1 1;.-. -0-g, __Q:--.a__—__M;IA.L “C, _. ---___-._______ . t—f LE @105).-. 1 CA: 0-.3-AL_-- 1E MEI-.1 i.i;-E.::i-5A..;'H:eiiL;:z-A-Liiab.w: Zéiii EIJIHELEA .AJ AJ. n.» E i E..EEE‘EJHJEIJJLEiiHiS'Abﬁ‘AﬁEJEAltLulu}:-. 373 ”tween/“an, k..- — L; up °e _. 1.12....r- —10\$(.Q-1-S-) W. W- W. .. . 2Q 59L-Wk’1'1lW/m. ‘ .. .. . . B .. . ., exﬁkMMIGI‘l-I 3:..“; 0 SC“ “lam“- L‘ 39.10.... '— W..... . . “_..-WWAMW _-V... W..-W.. WEI-"TW- 9' “3 "'05 W..-W.. -W- -.- 'w-"W =_ + JQC: “:1;ng “37..- m... Jm web» 1’0. kM- T - 11,- _\I-IW_¢~1‘_M.W.U.-rs.-.}er-.4.5L.M . ’. .fo..\$...‘ffﬂ.1£ .. v? _ “WA-D --.-_.. LI 93 m;_ 9.3} ”9‘ U u mmm,.m..._....W. WWW“ . "____,__—-—- C.).- \$0—QLLJIq- mum-*gb-QMWW .. “A \W. C“... fr»...- E...- W 9.5. “F:- . . _W...-...-..._.r.-. “rm-7...”... . , . . . . . W..—...mmwmumuqmm. .. .. - ----------- W" m ‘ ”Hug—Wamm.mwvm-._ . .. .... _.L..s-vvnm‘«-I mama... -.. . .. . .. . .. . . .. . . 7.4,.MW—Awqm+-mmm .: .M—«qxwﬁ. ﬂmﬁw mud—ﬂ... . . . _.....__..... “mm-“Wm...“me-m _.. - .. . ”mm...“- . ._.. ...Q-m...)- .= _ma... “.7..- W.=.;.u;.a: :szmxnum.._>.1_.,.:M..._.,._-...u....._._..;_ ..-«Mm.._.-....-...,..W__r_,..W.....» _..-...- . ..._ . ...-... . .Www-W ._ ‘ T !E I .I-Ii-afiiiI-iiiié ‘3‘: HI .;I twin-E‘s;- ﬂ: Inglés‘: tidih‘itéiiiii .: d} '-‘£1E’I- . ‘ - 1 ;.2..|-JILI‘I:i-Hil.s.=}ﬁ iiﬁisii: I‘I. . ...
View Full Document

{[ snackBarMessage ]}

### Page1 / 6

Test%202%20solution,2005 - CHE 4473(Kinetics Test#2 Name...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online