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# OAR Box 1878 Prepped by Charmelle Mathews



## Document

Number: 

# 71)11-1- 1 Docket Number: 

# A-90-1 9

Printed 11/28/20081:21:24 PM Sheet 71 of 145

# I P. 2

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L OKU N do f thi s volume
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# u

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# A-90-1 9 11-1- 1 

# AIRPOLLUTIO

N THIR D EDITIO

N VOLUM E I V Engineerin g Contro l o f Ai rPollutio n 

# ^riiUIJJL J n fPAAIRDOrK-p j

Edite dby 

### Arthur C . Ste m Department

o f Environmenta

l Science s an

dEngineering Schoo l o f Publi c Healt

h Universit y o f Nort h Carolin aa t

Chapel Hill Chapel Hill , Nort

h Carolin a



### ACADEMI

C PRES S Ne

w Yor k Sa n Francisc o Londo

n 197 7 A Subsidiar

y o f Harcour t Brac e Jovanovich , Publisher s

I 5T i

### T o Rober tC . an d Patricia , Mary an d Ers i

COPYRIGH T © 1977 , B Y ACADEMI C PRESS , INC . AL L RIGHT S RESERVED . N O PAR T O F THI S PUBLICATIO N MA Y B E REPRODUCE

D O R TRANSMITTE D I N AN Y FOR M O RBY AN

Y MEANS , ELECTRONI C O RMECHANICAL , INCLUDIN G PHOTOCOPY, RECORDING , O RAN Y INFORMATIO N STORAG E AND RETRIEVA

L SYSTEM , WITHOU T PERMISSIO N I N WRITIN G FRO M THF. PUBLISHER.
ACADEMI C PRESS , INC . I l l Filt hATOMIC . Ne w York . Ne w Yor k 1000 3
United Kingdom Edition published by ACADEMI C PRESS , INC . (LONDON ) LTD . 24/2 8 Ova l Road
. Londo n NW I Librar y o f Congres s Cataloging i n Publication Dat a Stern , Arthu

rCeci l Engineering contro l o f

ai rpolution . (Hi s Airpollutio n ; v . 4 ) (Environmenta l sciences ) Include s bibliographica

l references an

d index . 1 . Air-Pollution . 1. Title . II . Environmenta

l sciences . TD883.S8 3 197 6 vo

L 4 628.5' 3 ISBN 0-12-666604- 0 Series : 76-828 8

PRINTE D I N TH E UNITE D STATE S O FAMERIC A33 8 AMU b IUttr \

10 0 Tim e (doys ) Figur e 3 . Saturatio n o f coconu t shel l activate d carbo n i n commercia l appl e stor ag e (Entiat , Washington) . X : Adsorbe d water ; Q: adsorbe d organi c vapors . well a s with increasin g molecular weigh t i n aserie s o

f compound s o

f re late dchemical structure . Figur e 3 , take n fro

mastud y o

f th e saturatio n o

f activate dcarbo n i n an appl e storag e atmospher e a t 85 % relativ e humidit y an d35°F , show s ho w th e initiall y adsorbe dmoistur e i s graduall y displace db y th e adsorbe dorgani c vapor s (4) . C . Oxygenated

Adsorbents Thes e compris e th e silic agels , fuller's , diatomaceous , an dothe r siliceou s earths , an dsyntheti c zeolite s o r "molecular

sieves. " The y also , includ e metalli c oxides , notabl y AI2O3 , whic h ar e eve n mor e pola r tha n th e sili

ceou s compounds
. A s previousl y noted , thes e material s exhibi t greate r specificit y o f adsorptio n tha n d o th e activate dcarbon s o n th e basi s o f preferenc e fo

r more pola

T molecules
. I n addition , th e syntheti c zeolite s ca n b e mad e with specifie dan duniformpor e diameters , whic h giv e the m outstandin g propertie s o f adsorben t

specificity on th e basi s o f siz e o r shap e o f adsorbat e molecules
. Eve n thi s structura l uniqueness , however , doe s no t obviat e th e preferenc e o f th e adsorbent ) fo

r pola r rathe r tha n nonpolar molecules ; a s aresult , thes e material s wil l no t adsorb organi c 8 0 O 7 0 0 O w6 0 0 g 5 0 tn 8 4 0

, 0 0 3 0 ~£ 0 2 0 1 0 -

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n 

# L , . . . s 

# tl!iitlt|l|| ? I f £ *•" ! 1 " c Inreosln g orde r o

f affinit y fo r silic

a ge l Figur e 4 . Relationshi p betwee n dielectri c constan t o f solven t an d affinit y fo r silic a gel . molecules , eve n o

f size s whic h matc h thei r pores , fromamois t

airstream , th e wate r molecule s bein g adsorbe di n preference
. Th e relationshi p betwee n th e polarit y o f an adsorbat e an dit s affinit y fo r polar adsorbant s i s show n i n Figur e 4 , whic h display s variou s sub

stance s i n th e orde r

o f thei r affinit y for silic agel {6). Th e dielectri c con stant , whic h i s agoo dinde x of electri c polarity , closel y follow s th e affi

nity order
. Thes e relationship s impl y tha t small , pola r

molecules , suc h a s methano l o r

formaldehyde , ca n b e effectivel y remove dfro mdr y ga s stream s b y strongl y pola r adsorbent s lik e A1 2 0 3 , an dtha t th e saturate d adsorben t ca n b e effectivel y regenerate dwit h water . D. Adsorbent

Impregnations

. Th e effectivenes s o

f adsorben t

impregnation s ma y b e relate dt o an y o f th e following mode s o

f action : 1 . Th e impregnan t

ma y b e areagen t

tha t chemicall y convert s apol

lutan t t o aharmles s o r

adsoTbabl e product
. A s a n example , carbo n ma y