Gas Absorption Lab

 

The University of Tennessee at Chattanooga College of Engineering and Computer Science Engineering 435 Chemical Process Systems Laboratory

Gas Absorption Column

Team Members: Andy Guider  Marc Moss

ENGR 435-001 Dr. J. unnin!"am #c$ober 13% 1&&'

 

ntroduction T"is !rou( )as assi!ned $"e $as* o+ ana,yin! $"e coun$er-curren$ (ac*ed $o)er !as absor($ion co,umn ,oca$ed in room 303 o+ $"e Adminis$ra$ion ui,din!. T"e be"a/ior o+ $"e (ressure dro( in re,a$ion $o /arious /a rious !as and )a$er +,o) ra$es )as used $o +ind $"e  (ac*in! +ac$or +or $"e 3' diame$er !,ass rin!s $"a$ +i,, $"e $"e co,umn. T"is re(or$ discusses $"e (rocedure +o,,o)ed )"i,e (er+ormin! $"e e2(erimen$s. $ be!ins )i$" a descri($ion o+ $"e Gas Absor($ion o,umn% a,on! )i$" $"e $"eory o+ "o) i$ )or*s. $ is +o,,o)ed by $"e e2(erimen$a, (rocedures and $"e resu,$s ob$ained. T"e re(or$ is conc,uded )i$" a discussion o+ $"e si!ni+icance o+ $"e e2(erimen$ and $"e resu,$s% as )e,, as $"e conc,usion dra)n. An a((endi2 is a$$ac"ed $o $"e end o+ $"e re(or$ and inc,udes $"e ra) da$a c"ar$s and re+erences.

Theory and !ac"grou !ac"ground nd T"e (ac*ed $o)er is a common a((ara$us used +or !as absor($ion. $ consis$s o+ a cy,indrica, co,umn eui((ed )i$" a !as ! as in,e$ a$ $"e bo$$om% as )e,, as a ,iuid in,e$ a$ $"e $o( see 6i!ure 1.7 T"e ,iuid +,o) en$ers a$ $"e $o( and $ra/e,s $"rou!" a d dis$ribu$or is$ribu$or de/ice )"ic" ensures eua, +,o) $"rou!" $"e co,umn. #nce $"e ,iuid $ra/e,s $"rou!" $"e  (ac*in! ma$eria,% i$ e2i$s $"e co,umn $"rou!" an ou$,e$ a$ $"e bo$$om. T"e !as en$ers a$ $"e  bo$$om and $ra/e,s coun$er-curren$ $o $"e ,iuid% e2i$in! e2i$in! a$ $"e $o( o+ $"e co,umn. T"e co,umn used +or $"is e2(erimen$ "as an inside diame$er o+ 3 inc"es and "as a $o$a, (ac*ed "ei!"$ o+ 5 +ee$. $ is (ac*ed )i$" 3' diame$er !,ass Rasc"i! rin!s. T"e !as is a (ressuried air s$ream% su((,ied a$ 40(si! +rom $"e bui,din!. T"e ,iuid is )a$er

 

 (um(ed ou$ o+ a reser/oir% and is re$urned $o $"e reser/oir a+$er a+$er $ra/e,,in! $"rou!" $"e co,umn. T"e sys$em is con$ro,,ed and $"e da$a is recorded by $"e com(u$er (ro!ram 8ab9ie)% 8ab9i e)% )"ic" is ins$a,,ed on a Macn$os" com(u$er. ince $"e co,umn )as no$ ana,yed +or $"e !as absor($ion% $"e on,y eua$ions used )ere $"e ones +or ca,cu,a$in! $"e /a,ues used on $"e (ressure dro( corre,a$ion c"ar$.

 Abscissa :

G x G y

 ρ  y  ρ  x >

Ordinate :

;"ere:

517

−  ρ  y

G y  F  p µ  x

0.1

 g 5 ρ  x −  ρ  y 7 ρ  y

5>7

G2 < )a$er +,o) ra$e% in ,bssec=in > > y

G  < air +,o) ra$e% in ,bssec=in densi$y o+ )a$er% in ,bs+$3 3 ρy < densi$y o+ air% in ,bs+$ µ2 < /iscosi$y o+ )a$er% in cen$is$o*es ! < acce,era$ion due $o !ra/i$y% 3>.> +$sec> 6? < (ac*in! +ac$or  ρ2 <

 

;a$er n

?ressure Ta(

Air #u$

?ressure Ta( Air n ;a$er #u$

#igure $% Pac"ed To&er Schematic 'iagram

Procedure

 

Ten Ten runs )ere made a$ di++eren$ air +,o))a$er +,o) combina$ions. Eac" run )as s$ar$ed and $"en a,,o)ed $o run un$i, $"e sys$em "ad reac"ed s$eady s$a$e. A+$er $"e sys$em "ad been a$ s$eady s$a$e ,on! enou!" a((ro2ima$e,y one minu$e7 +or $"e com(u$er $o record a su++icien$ number o+ da$a (oin$s $o ana,ye% $"e run )as ended aand nd $"e da$a )as sa/ed.

(esults Tab,e 1 con$ains $"e a/era!e /a,ues +or $"e air +,o)% )a$er +,o) and (ressure dro( across $"e co,umn +or eac" o+ $"e $en runs. A,so inc,uded are $"e /a,ues ca,cu,a$ed usin! eua$ion 17% and $"e (ac*in! +ac$or 6 (7% )"ic" )as ca,cu,a$ed usin! eua$ion >7 and $"e  (ressure-dro( corre,a$ion c"ar$ be,o)7.

'iscussion

 

Durin! $"is e2(erimen$% )e )ere ab,e $o ma*e $en runs% "o)e/er $"e +irs$ si2 "ad $o be $"ro)n ou$ because $"e abscissa abscissa /a,ues $"ey yie,ded )ere $oo "i!" +or $"e corre,a$ion c"ar$. T"e remainin! +our )ere used $o ca,cu,a$e $"e (ac*in! +ac$or. T"e +our /a,ues ob$ained )ere a/era!ed $o !i/e a (ac*in! +ac$or o+ 15@&. T"is com(ares some)"a$ +a/orab,y $o $"e ,i$era$ure /a,ue o+ 1000 100 0 !i/en +or 3' ceramic Rasc"i! rin!s. T"e di++erence cou,d be e2(,ained by $"e di++erence in ma$eria,s% as $"e rin!s )ere made o+ !,ass +or our e2(erimen$s. #n,y usin! +our runs means $"a$ $"e error )as /ery "i!"% bu$ $"is cou,d no$ be a/oided since $"ere )as no$ enou!" $ime $o ma*e more runs.

Conclusions and (ecomm (ecommendations endations ein! ab,e $o use ,ess $"an "a,+ $"e da$a !a$"ered means $"a$ $"e (ac*in! +ac$or ca,cu,a$ed is some)"a$ sus(ec$. A more com(,e$e corre,a$ion c"ar$ )i$" abscissa /a,ues "i!"er $"an 107 )ou,d a,,o) $"e o$"er da$a $o be used. To coun$er $"is (rob,em% more runs cou,d "a/e been made usin! "i!"er air +,o)s andor ,o)er )a$er +,o)s.

(eferences a,/er$% eymour and aro,d M. En!,und. andboo* o+ Air ?o,,u$ion Tec"no,o!y Tec"no,o!y.. ;i,ey and ons. Ne) Bor*. 1&'4. Mcabe% mi$" and arroi$. Cni$ #(era$ions o+ "emica, En!ineerin!% 5  $" ed.

 

McGra)-i,,% Ne) Bor*% 1&&3 .

Table of Contents .

n$roduc$ion

.

T"eory and ac*!round

 

.

?rocedure

9. Resu,$s 9.

Discussion

9. onc,usions and Recommenda$ions 9. A((endi2 A. Re+erences . am(,e a,cu,a$ions . Ra) Da$a

A((endi2