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TitleAbsorption & Stripping
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Total Pages875
Table of Contents
                            Front Cover
Absorption and Stripping
ISBN: 8-1841-2033-8
Preface
Table of Content
Notations Used In The Book
1: Absorption
	1.1. Applications
	1.2. Gas-Liq Equilibrium: Conditions of
	1.3. Driving Force
	1.4. Absorption Mechanism
	1.5. Mass Transfer Resistance
	1.6. Absorber
	1.7. Material Balance of a Countercurrent Absorber
	1.8. Minimum Liq-Gas Ratio
	1.9. Material Balance: Cocurrent Process
	1.10. Tray Towers
	1.11. Packed Bed Absorber
	1.12. Diameter of a Plate Column
	1.13. Height of a Plate Column
	1.14. Choice of Solvent
2: Stripping
	2.1. The Driving Force
	2.2. Countercurrent Flow: Material Balance for Single Component Stripping
	2.3. Packed Bed
	2.4. Packed Bed Design
	2.5. Multi-Tray Stripper
	2.6. Absorption-Stripping System
	2.7. General Equations for Calculating Actual Plates in Absorbers and Strippers
	2.8. Sour Water Stripper
	2.9. Different Methods for Removal of VOCs
	2.10. Air Stripping VOC in Trayed Columns
	2.11. Designing Air Strippers [Packed Towers]
	2.12. Design of Steam Strippers for VOC Removal
	2.13. Steam Stripping Toluene from Water: Performance of a Sieve-Tray Tower
	2.14. Improving Sour Water Strippers
	2.15. Reboiled Stripper Improves Performance
	2.16. Water Deaeration
3: Hydraulics of Operation
	3.1. Plate Columns
	3.2. Hydraulics of Packed Towers
4: Design : Basic Concepts
	[A]  Trayed Towers
	[B]  Packed Tower
5: Design : Absorbers & Strippers
	5.1. Design of Sieve Trays
	5.2. Design of Valve Trays
	5.3. Design of BubbleCap Trays
	5.4. Packed Bed Absorber Design
6: Packings
	6.1. Random Packings
	6.2. Regular Packings
	6.3. Selection and Design Guide to Random Packings
	6.4. Loading of Random Packing
7: Packed Tower Internals
	7.1. Packing Support Plates
	7.2. Gas Distributors
	7.3. Bed Limiters and Hold down Plates
	7.4. Feed Liquid Distributors
	7.5. Liquid Redistributor
	7.6. Wall Wipers
	7.7. Liquid Collectors
8: Typical Absorptions of Industrial Importance
	8.1. Gas Dehydration
	8.2. Selective Absorption
	8.3. Selective H2S-Absorption By Using Aqueous Ammonia Solution
	8.4. Low-Temperature Acid Gas Removal (AGR)
	8.5. Sulfuric Acid Manufacture
	8.6. Absorption with Chemical Reaction
	8.7. COiH2S-Absorption by Amine
	8.8. S02-Scrubber Design
	8.9. Natural Gas Treating: Helpful Hints for Physical Solvent Absorption
	8.10. Process Design For VOC Removal,
9: Revamping Absorbers and Strippers
	9.1. Natural Gas Dehydration
	9.2. Absorption of Hydrogen Sulfide and Carbon Dioxide
	9.3. Revamping Ethylene Oxide Absorber
	9.4. Revamping A Packed-Bed Steam Stripper
	9.5. Revamping A Hydrogen Chloride Absorber
10: Cost Estimation of Absorption Tower
11: Miscellaneous
	11.1. Hindered Amines for Efficient Acid-Gas Removal
	11.2. Pros and Cons of Different Processes for Selective Removal of H2S and CO2
	11.3. Corrosion Problem in Gas Absorption Column
	11.4. MOC of CO2 -Absorber (MEA System)
	11.5. Quantum Leap Technology
	11.6. Use Chart to Estimate Acid Gas Solubility in TEG
Index
Back Cover
TrUe LiAr
                        
Document Text Contents
Page 1

ABSORPTION
AND STRIPPING

P. C1rtlttoplld/rylly

Page 2

Absorption
&

Stripping

P. Chattopadhyay
Senior Faculty

Dept. of Mechanical Engineering
Techno India College of Technology,

Rajarhat, New Town,
Kolkata-700 156

t4 ,4SU:l1f "B",,1u ']>Il'Ult, t.lHtltIU
7/28, Mahavir Lane, Vardan House, Ansari Road,

Darya Ganj, New Delhi-ll0002

Page 437

3.14 Absorption & Stripping

I I

~alv~ ft-- Valve ~i4 Valve Partly OpeR ~~ F~y Closed , ,
100

0 N
:E:

, I , , L = 1.5 m3Jh
~

OE
NE

80 :E: -:'
E 01
E~
&ci

a. 0
<l .. 60 ~O
Q,CD
e'S
00::
S~
CIS CD 40 - -Q.CIS
~.~
o.!:

20

, -'
I \ V- // L = 3m3Jh \ ,

\ Y ~ ~ / Irrigated
Plate Drop

....-" ~ t:: V L = 6 m3Jh A ~ - L
~ \. ..-~ i"""'" ~ iB / ./ ~ III -~ ~ !

".
10-"""'" , , V

I i.. .......
!

-r ~
! , ,

Ai ,
~! j I

/
, Dry Plate Drop - ,

C

V , ,
/ , !

o ~
',/ , ,

I ,
o 0.2 0.4 0.6 0.8 1.0 1 .2 1.4 1.6

Gas (Vapor) Velocity, V g' m/s

Fig. 3.13. Pressure Drop Curves of A typical Valve Plate

and the higher limit from:

1

[vGr:
gb = 0.9[~. m y • g ]2

f4- f3 PG·ao
... {3.15)

where, [vG]rr = gas velocity in the region - II, m/s
lIly = mass of a valve, kg
PG = gas density, kg/m3
8

0
= area of a single hole, m2

fl ' f2 , f3 ' f4 ' are friction factors:

... {3.16)

[ ]

-2.49 [ ]

f2 =6.71!: .exp 5.91 ::. ...{3.17)

f3= 920 Aa
[ ]

2.95

Av,max
... {3.18)

Page 438

Hydraulics of Operation

f4 = 2160 Ao
[ ]

0.8

Av,max

Ao = hole area of a plate, m2
A" = total open area of all valves on a plate, m2

A", i = total initial open area of all valves on a plate, m2
The upper maximum, aJ!owable hole velocity:

[vG, Jmax = 1.3 [VG]~Iigh
and the lower minimum allowable hole velocity:

[vG, Jmin = 1.3 [va1!;w

Dry Pressure Drop

The dry plate drop across the plate with

valves fully closed:

Zone - I

[ ]

2
fl Q v 0 Po

[AP] = - -'- .- m ofliq
dIg A P ,

o L

valves partly open:

Zone - II

valves fully open :

Zone - III

Hydraulic Load

The gas pressure drop across the pool ofliq-on-tray :

[ ]

0.25 [ ] 0.35

APL = 0.27 ~ . h!85. ~:L ,m ofliq

where,1\ = tray area, m2•
Q L = volumetric liq rate, m3th v,
hw = weir height, m
Aa = active area (area of perforated sheet) of tray, m2

3.15

... (3.19)

... (3.20)

... (3.21)

... (3.22)

... (3.23)

... (3.24)

... (3.25)

Page 874

1.14

Velocity,

Superficial Gas, 3.17

Vertical Alignment, 4.43

VLE,1.22

Viscosity, 1.70

VOCs

Different methods for removal of, 2.98

Air stripping, 2.98

Design Equations, 2.99

Design Procedure, 2.99

Steam stripping,

Advantages of, 2.98

Volatility, 1.68

VOC Removal

Process Design for, 8.107

Process Design Equations

Absorber, 8.108

Stripper, 8.109

Diameter, 8.110

w
Wall Wipers, 7.33, 7.34

Water deaeration, 2.166

Design of, 2.16

Weepage Limit, 4.27, 4.28

Weepage Rate, 4.20

Weep Holes, 4.51

Weeping, 3.7, 3.16, 5.11

Weirs

Weir

Outlet, 4.40

Crest, 5.8

Dimensions, 4.40

Height, 5.8

Height Tolerance, 4.41

Length, 4.10

Wind Loading, 4.43

Absorption & Stripping

DO

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Page 875

ABSORPTION AND STRIPPING
The prmIry objedM ,1 the bo.* is 10 IIeIp rMderJ ~n lUflialnl IMlght into twirl UM
.,.... Woo. .-aSORf'TJON AND SlltIf"I"ING- end their eppIc.etlon to industrlM.

A1mo.t .. milJor Che!niat PrOCIIU 1ndus1.1n (CPb) and Plltlocheo"ic.1 Indimrift (PCtl) ..
IllOdMtod with Inn. two 101M oper~ w+wd!. ~ often 1"-" !lOt. oper ... In ~ WJth
ch"'.I.In......"p&-t ..

SI.rting from In. ~ buia, the boo/II 11M d~ ... length u.. ..... sary ............... .....:1
th.ormcaI 0. •• Iopt" .. ot of abtooption...d IIripping ..... ~ of absorption and ~;on,
~ _.-.-10 det...,... .... .Hkiency of III: I Q pbon .. IUoppitlg .... -....on 01 number
I'IIY' ill tt.,.cl coUNw end ftt.mMoon 01 plded Mel ~ht In p.d!" 1 __ ~. hundred
l'Iumetic.ll Ulmplet ..... a t./fIthe r- , -1M. to gel II ~ grip on 1M tMonM IIl!plelnld More IMIt ...
hundNd colored, bIad. .. white ~lustrati0n5 will do justic:eto It

H)'dt ," • .to,-.-oI.nlheUwM~tr.,.t)'FII ....... , ........ bo lot" tapu.,....andtlvtof
f»Cked bed hivi Meft upiflined to tnt minutHt d.\.ill, ~ al$O .. tt.. fklOB .-d
1*_ .... tn.lln~ the hydr.ulla. of .,-ck.cl I_t. Thi,l, followed by the baoe ~"cepu 01
dH91 0I71'.y To ••• lind Packed CoMMa sane. grHt.mpn...;. '- bHo! I.od 011 dftign. two
c:Npt.n duI ~ w,th 0nIpL ArnaIganvted WIth them .. m.q.1M.. l"IUi,ot..l of d '911
lJoao''I2'.1 of industrill ~_ 0...'51" consldermor.. dnign 9 - ! IE _ .. operiltion of imporunt
~t' .. lIblorptJOn ...... been diKwMd It Itongth.

P ... · 'i'~ ""ioY illfNdeI poi""'" ''' .... book _ they _ ..... QIt .-v<tllbly .... ',., IIb.orptlOll"
Itnppug operati0n5. So OM whole cNptef lies bMI'I cIreoYottd to piCking. Equ.Iy Import_ ..
PKlt"' T_r IntlH'nM without whictI .... padUng', functions g.t lerio.nly ~. So little
wonct.rwhyHCtt&ewwywcht_intemtl.*~diKu • ..din~~".

~ the book bri. hNvoit 01'1 1nduI1t1n. U. '-' th, .. cNptan haw ~ ~..:I to
Ab.-ptlon " Stripphg of Indu.trW hnportanu, It.vamplng of AMorbe ... " Strip".... end
COlt &tinvtIon frl Absorpdoll TowI .... Prof" ........ chemlQl .. ogio .. , ..... )' rlOld them interesting

The~ofthebool<lII'impleand_y~lloIChtNt_p .. wrthlbMC"""~dio'llllof
~ 11",'l1li Md Idence .. able to comprehend

p. CNttCl'pIIlh,.,.. Seniof "-to .... III M4oc:nIniaoI Eng~ " •• 'l1li of TedYoo L'"
CI'I!iJ' 01 Techcolog),. s.tt uu. KoIkauo and f~ • Senior P'c......u
Eng<nftr of HFC Hlldl, Division 101' 25 yurs bId<..:I I.Ip by ..-. than two-
dec .. of Ixpetiencl " pwt-tome lactu ... oJ Advancl Coune in HFC T,a:ninsI
..... Mut. ,"d-'''I MKt. .. ..,., ••• Et9"'11;''1111 ,.....n~ia. Auld
Mec:Nnic$, El9' •• ;''l1li Mechan:a. tw.t T,_f., and UM OpcwMions

cn.uopedhy.yhls authored nina boo .... ==,.,== Bel' d •• hen. C1»UthorItd the book CFB Techoologj. He -.0 .... '0 his cr.cit
..... _Te6 p8f*'1&s-.-.......,idft,.

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