Air containing 1.6 vol% SO2 is scrubbed at 1 atm with pure water in a packed column of 1.5-m2 cross-sectional area and 3.5m height, packed with No. 2 plastic Super Intalox saddles. Total gas flow rate is 0.062 kmol/s, liquid flow rate is 2.2 kmol/s, and outlet gas SO2 concentration is y = 0.004. At the column temperature, the equilibrium relationship is y* = 40x. (a) What is L/Lmin? (b) Calculate NOG and compare your answer to that for the number of theoretical stages required. (c) Determine HOG and the HETP from the operating data. (d) Calculate KGα from the data, based on a partialpressure driving force as in Item 2 of Table . Table 6.5 Alternative Mass-Transfer Coefficient GroupingsHeight of a Transfer Unit, HTUNumber of a Transfer Unit, NTUEM Diffusionor DiluteUM DiffusionEM Diffusionor DiluteDriving ForceSymbolUM DiffusionUM DiffusionSymbolUM Diffusion(1- у)мdy(1- y)(y-y)dy1. (y -y)НоаKasKa(1-y)MSNoG(P - P)LMdpP-p(p-p)dp2. (p-p)НоаNogKgaPSKha(1 - yhPSP- pdYdY3. (Y- Y")НоаNoGKyasKyas(Y - Y")(Y -Y")(1- y)LmdyJi-0 - )dy4. (y - )НаNgkyasKa(1 - y)LMS(P- PLMdpJP- P)P- P)dp5. (p- P)НаkyaPSKa(P - PLMSNg- P)(1- x)1mdx1- x)(x* - x)L.dx6. (x -x)HOLNoLKasка(1 — х)лмSde7. (e - e)P/M-cmdxJ (PL/ML - e)(e - c)НoLNOLKra(P/M)SK'ja(P/ML - c)IMsL'L'dX8. (X - х)XPHOLNoLКхasKxas(X" - X)X -X)(1- х)лмdx(1-x)(x - x)L.L.dx9. (x - x)нN.kask a(1 - x)1MS(4 — х)(PL/ML. - c), mdeI (Pr/ Mr. - c)(a - c)L.de10. (a - c)НLNEkra(pL/ML)Skta(Pr./ML --c)LMS(a-*The substitution K,=Kyar its equivalentcan be made.

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Answered: Table 6.5 Alternative Mass-Transfer…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

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Air containing 1.6 vol% SO₂ is scrubbed at 1 atm with pure water in a packed column of 1.5-m² cross-sectional area and 3.5m height, packed with No. 2 plastic Super Intalox saddles. Total gas flow rate is 0.062 kmol/s, liquid flow rate is 2.2 kmol/s, and outlet gas SO2 concentration is y = 0.004. At the column temperature, the equilibrium relationship is y^* = 40x. (a) What is L/L_min? (b) Calculate N_OG and compare your answer to that for the number of theoretical stages required. (c) Determine H_OG and the HETP from the operating data. (d) Calculate K_Gα from the data, based on a partialpressure driving force as in Item 2 of Table .

Table 6.5 Alternative Mass-Transfer Coefficient Groupings
Height of a Transfer Unit, HTU
Number of a Transfer Unit, NTU
EM Diffusion
or Dilute
UM Diffusion
EM Diffusion
or Dilute
Driving Force
Symbol
UM Diffusion
UM Diffusion
Symbol
UM Diffusion
(1- у)мdy
(1- y)(y-y)
dy
1. (y -y)
Ноа
Kas
Ka(1-y)MS
NoG
(P - P)LMdp
P-p(p-p)
dp
2. (p-p)
Ноа
Nog
KgaPS
Kha(1 - yhPS
P- p
dY
dY
3. (Y- Y")
Ноа
NoG
Kyas
Kyas
(Y - Y")
(Y -Y")
(1- y)Lmdy
Ji-0 - )
dy
4. (y - )
На
Ng
kyas
Ka(1 - y)LMS
(P- PLMdp
JP- P)P- P)
dp
5. (p- P)
На
kyaPS
Ka(P - PLMS
Ng
- P)
(1- x)1mdx
1- x)(x* - x)
L.
dx
6. (x -x)
HOL
NoL
Kas
ка(1 — х)лмS
de
7. (e - e)
P/M-cmdx
J (PL/ML - e)(e - c)
НoL
NOL
Kra(P/M)S
K'ja(P/ML - c)IMs
L'
L'
dX
8. (X - х)
XP
HOL
NoL
Кхas
Kxas
(X" - X)
X -X)
(1- х)лмdx
(1-x)(x - x)
L.
L.
dx
9. (x - x)
н
N.
kas
k a(1 - x)1MS
(4 — х)
(PL/ML. - c), mde
I (Pr/ Mr. - c)(a - c)
L.
de
10. (a - c)
НL
NE
kra(pL/ML)S
kta(Pr./ML -
-c)LMS
(a-
*The substitution K,
=Kya
r its equivalentcan be made.

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