Chapter 2: Conversion and Reactor Sizing

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1 CHEMICL RECTIO EGIEERIG (SK3223) Chapte 2: Convesion and Reacto Sizing W ORHRYTI W SLLEH hayati@petoleum.utm.my RIZI MD. KSMI afiziana@petoleum.utm.my

2 Convesion, To quantify how fa a eaction has pogessed How many moles of C ae fomed fo evey mole consumed Conside : a bb cc dd The basis of calculation is always the limiting eactant b a B c a C d a D Ievesible eaction: max =. (complete convesion) Revesible eaction: max = equilibium (equilibium convesion)

3 COERSIO = moles of eacted / consumed moles of fed Batch system (,t) low system (,/W) - ( mol) ( = moles of consumed / eacted ) ( mol / s) ( = mola flow ate at which is consumed / eacted )

4 BTCH RECTOR o batch eacto, we ae inteested in detemining how long to leave the eactants in the eacto to achieve a cetain convesion om mole balance: d dt om the convesion: This is how the Design Equation deived fom mole balance equation in tems of convesion Diffeentiating with espect of time: d dt d dt = : constant with espect of time d dt d dt t d 4

5 GS LOW SYSTEM The enteing mola flow ate, (mol/s) C mol s C C mol 3 dm fo gas P RT 3 dm. s system yp RT C = enteing concentation, mol/dm 3 Y a = enteing mole faction of P = enteing total pessue, kpa T =enteing tempeatue, K P a = enteing patial pessue R= ideal gas constant = 8.34k.Pa.dm 3 /mol.k

6 CSTR ) ( om mole balance: Design Equation: om the convesion:

7 PR om mole balance: d d om the convesion: Design Equation: Diffeentiating with espect of volume: d d d d = : constant with espect of volume d d d d d

8 PBR om mole balance: d dw ' om the convesion: Design Equation: Diffeentiating with espect of weight of catalyst: d dw d dw ' d dw ' d dw W d '

9 DESIG EQUTIOS Design Equations fo Isothemal Reactos RECTOR DIEREETIL LGEBRIC ITEGRL ORM ORM ORM BTCH d O ( ) dt t O d CSTR ( O ( ) ) Exit PR O d d ( ) d PBR O ( ' ) dw W O d d O ' 9

10 RECTOR SIZIG By sizing a chemical eacto we mean we'e eithe detemine the eacto volume to achieve a given convesion o detemine the convesion that can be achieved in a given eacto type and size. omally, the pocess / expeimental data will be given (, - ) PR Simpson's One-Thid Rule is one of the moe common numeical methods. Othe numeical methods (see ppendix.4, pp 3-5): (i) Tapezoidal Rule (2 data points) (ii) Simpson's Thee-Eighth's Rule (4 data points) (iii) ive-point Quadatue omula (5 data points)

11 Reacto Sizing Levenspiel Plot CSTR PR

12 RECTORS I SERIES Why? Sometimes 2 CSTR eacto volumes in seies is less than the volume of CSTR to achieve the same convesion. Can model a PR with a lage numbe of CSTR in seies. In the case of PR, whethe you place 2 PR in seies o have PR, the total eacto volume equied to achieve the same convesion is identical.

13 RECTORS I SERIES = = convesion achieved in the PR PR 2 = convesion achieved in the PR & CSTR 2 alid only fo O side steams: CSTR 3 PR 3 3 = total convesion achieved by all 3 eactos

14 (i) CSTR in seies: ( 2 2 ) - 2 (ii) PR in seies: d d - 2

15 (iii) CSTR + PR in seies: d ( )

16 SPCE TIME, The time necessay to pocess one eacto volume by the volumetic ate enteing the eacto lso called the holding time o mean esidence time time volume volume/ time whee is entance volumetic ate 6

17 SPCE ELOCITY (S) S Recipocal of the space time, Two S commonly used in industy: GHS Gas Houly Space elocity, h - v at STP (standad temp. and pessue) LHS Liquid Houly Space elocity, h - v at some efeence tempeatue

18 REERECES Main Refeence:. ogle,h.s., Elements of Chemical Reaction Engineeing, 4 th Edition,Pentice Hall, ew Jesey, 26. Othe Refeences:. Davis, M.E and Davis, R.J, undamentals of Chemical Reaction Engineeing, Mc-Gaw-Hill, ew Yok, Schmidt, L.D, The Engineeing of Chemical Reactions, Oxfod, ew Yok, Levenspiel,O., Chemical Reaction Engineeing, 3 d Edition, Wiley,ew Yok, Smith,J., Chemical Engineeing Kinetics, 3 d Edition, McGaw- Hill, ew Yok, 98

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