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Chemical Engmeenng Science, 1968, Vol 23, pp 1173-I 180 Pergamon Press Pnnted m Great Bntam

Absorption of isobutylene inaqueous solutions of sulphuric acid

J K GEHLAWAT and M M SHARMADepartment of Chemical Technology, Umverslty of Bombay, Matunga, Bombay 19, lndla

(Flrsr recerued 26 March 1968, m reursedform 8 May 1968)Abstract-The kmetlcs of absorption of lsobutylene m aqueous solutions of sulphunc acid m therange of concentrations of mdustnal Importance was studied m a stlrred cell and aJet apparatus Thepseudo-first order reactlon rate constant at 30C was found to vary from 56 set-* to 7 87 X IO5see-over the sulphunc acid concentrations of 49 5 per cent (7 0 g mole/l ) to 71 0 per cent (11 75 g mole/l )The apparent energy of actlvatlon was found to be 13 0 kcal/g mole

A ~~~~~~~~~~ from any petrochemical sourcemvanably contains varying proportions ofbutane, butenes, lsobutylene and butadlene Atypical C,-fraction from a refinery stream or froma naphtha cracker may contam 13-19 per centlsobutylene If, however, butadlene IS recovered,the remammg gas may contam up to about 40per cent lsobutylene Separation and recovery oflsobutylene from the gaseous stream by selectiveabsorption m 50-65 per cent (wtlwt) aqueoussulphunc acid solution 1s practlsed commerciallyIsobutylene of high punty can be obtamed fromthe sulphunc acid-extract by steam stnppmg[l-4] Isobutylene 1s also converted to tertbutanol by absorption m sulphunc acid andsubsequent hydrolysisIt appears that lsobutyl sulphate 1s formed asan intermediate product which hydrolyses totert butanol

(CH&C= CH, + H,SO, + (CH&COS03H(CH3)&OSOsH+Hz0 --* (CH,),COH+H,SO,

There 1s some mformatlon m the literatureconcerning the absorption of lsobutylene maqueous solutions of sulphunc acld[5-lo].Taft11 11 studied the reaction between lso-butylene and 1 24 g mole/l aqueous sulphuncacid solution Also, there 1s some mformatlonm the literature on kmetlcs of the reaction mdilute aqueous solutions of mineral acids For

example, Lucas and Eberz[l2] measured therates of hydration of lsobutylene m dilute aque-ous solutions of mtnc acid Taft [ 1 l] studied thereaction of lsobutylene m mtnc acid solutions ofconcentrations up to about 5 g mole/l LaterPurlee, Taft and DeFazloj131 extended thework to obtam the values of dlstnbutlon coeffic-ient for lsobutylene between vapour phase andnitric acid solutions Recently Gupta andDouglas[ 141 studied the hydration of lsobutyl-ene with cation exchange resins The hydrationof lsobutylene by various acldlc catalysts hasbeen shown to be first order with respect to thelsobutylene concentration [5, 12, 15- 171 How-ever, practically no mformatlon IS avalable m theliterature concerning the kmetlcs of the reactionbetween dissolved lsobutylene and H,SO, m therange of sulphunc acid concentrations employedm practice This work was, therefore, undertakento study the kinetics of absorption of lsobutylenem aqueous solutions of sulphunc acid m therange of concentrations of mdustnal importance

EXPERIMENTALStrrred cell

lsobutylene was generated by the dehydrationof tert butanol and collected m an aspiratorbottle or balloon Most of the expenments werecarned out m a 9.5 cm I d glass stirred cell Thedesign of the stirred cell was similar to that usedby Jhaven and Sharma[l8] The stirred cell waskept m a constant temperature bath where1173


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J K GHELAWAT and M M SHARMAtemperature could be kept constant wlthm about+0*2C m the temperature range of 30-60CA glass stirrer with four flat blades, which Justdipped mto the liquid, was used The effectivemterfaclal area was 57 cm2 Expenments werealso camed out m a glass stirred cell of 5 5 cm I d.(effective mterfaclal area of 19 3 cm2) and m a15 cm 1d perspex stirred cell (effective mterfactalarea 160 cm2) A known amount of the solutionof pre-fixed H,SO, concentration was taken andthe volumetric rate of absorption of pure lso-butylene, stored m a balloon at essentiallyatmosphenc pressure, was noted Aqueous solu-tions of sulphunc acid of concentrations 49 5 percent to 71 0 per cent by weight were usedIn a few experiments carned out m the glassstirred cell of 9 5 cm 1d , the partial pressure oflsobutylene was varied from 0 35 atm to 0 96 atmby using nitrogen as a dlluent The mixture oflsobutylene and nitrogen m the desired propor-tion was passed through the stirred cell forsufficient time so that the partial pressure oflsobutylene m the stirred cell was the same asthat m the mcommg gas stream The gas phasem the stirred cell was also agitated by using acruciform stirrer about 0 5 cm above the gas/liquid interface The gas flow was stopped andthe unit was connected to a balloon containingpure lsobutylene at essentially atmosphericpressure After a couple of minutes the volu-metnc rate of uptake of lsobutylene was notedJet apparatus

The absorption of lsobutylene m aqueous solu-tions of sulphurlc acid was also studled m alammar Jet apparatus The prmclpal designfeatures of the Jet apparatus were akm to thoseemployed by Sharma and Danckwerts[l9] andwas the same as that used by Jhaverl andSharma[20] The time of contact was varied fromO-019 set to 0 04 set Only 71 per cent (wt/wt)H,SO, was used m the Jet apparatus

RESULTS AND DISCUSSIONThe specific rates of absorption of lsobutylenem different concentrations of aqueous solutionsof sulphunc acid m the stirred cells are plotted

against speed of agitation of the stirrer m Fig 1Figure 1 shows that the rate of absorption perunit mterfaclal area, R, g mole/cm2 set, was m-dependent of the hydrodynamic factors m therange of stirring speeds from 42 to 122 rev/mmFurther the specdic rate of absorption remainedpractically constant over about an elghtfold m-crease m the mterfaclal area The amount of theaqueous acid solutions used m vsulous runs withdifferent stirred cells was also varied threefold meach case It was found that the specific rate ofabsorption was independent of the amount of theacid solution taken. The values of the specific rateof absorption obtamed m the Jet apparatus arealso plotted against the time of contact m Fig 1The specific rate of absorption remained practlc-ally constant when the time of contact was variedfrom 0 019 set to 0.040 set The values of thespecific rate of absorption m the Jet apparatuswere wlthm about 5 per cent of those obtained mthe stirred cell

- CONTACT TIME (SEC) IN THE JET APPARATUS060 020 0 025 0 030 0 035 0 040x I I I I Iii

N 71 0%E t H2SO4 : r 1\ 504 i i i iz

i- --&- -Yr.70 2 % H2SO4

b; 4 0-, I5F 30apI t; 200 65% H2SO4E +----r-----i A-T9Y; , o_ ;605%HzO4 ; f c

I I 1 I 1CLu-8 40 60 80 100 120RPM-

Fig 1 Effect of rev/mm/contact time on the rate of absorptionof lsobutylene m aqueous soluttons of sulphunc acid mstu-red cell/Jet apparatus at 30Cx stn-red cell mterfaclal area 19 3 cm20 stn-red cell mterfaclal area57 cm2A stlrred cell mterfaclal area 160 cm20 Jet apparatus mterfaclal area 173 cm2

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The rate of absorption of lsobutylene m aque-ous solutions of sulphunc acid of concentrationsfrom 49 5 to 71 0 per cent (wtlwt) IS thereforeindependent of the hydrodynamic factors underexperimental condltlons of this work

I60 r

Eflect of pnrtrd pressure of rsobutyleneThe rate of absorption of lsobutylene at theprefixed partial pressure of lsobutylene waspractically constant for about ten mmutes Theoverall time taken for any run was such that therewas no slgmficant vanatlon m the sulphurlc acidconcentration The specific rate of absorptionof lsobutylene m 60 per cent and 65 per centwt/wt aqueous sulphurlc acid solutions wasfound to be proportlonal to the partial pressure

of lsobutylene (Fig 2) This ImplIes that thereaction IS first order with respect to lsobutyleneAs discussed elsewhere, the solublhty of ISO-butylene m 60-65 per cent wt/wt aqueous H,SO,IS very small ( -6 x 10~g mole/cm3atm) It 1sexpected that the gas side resistance would bepractically absent when lsobutylene 1s absorbedfrom mixtures of lsobutylene and mtrogenThe dissolved gas undergoes a pseudo-firstorder reactlon when the concentration of thereactant m the nelghbourhood of the gas/hquldInterface IS very little different from that m thebulk and the concentration of the dissolved gas1s very small compared to the reactant Thecondltlon to be sattsfied IS

I60 -3E 140 - AY-c I20 -

P 100 -0-

% 60- 0* 60 -a

I0 02 04 06 06 IO

Pi - cl,*Fig 2 Effect of pdrtlal pressure of lsobutylene on the rateof absorption

A 65% wtlwt aqueous sulphurlc acid0 60% wtlwt aqueous sulphurlc acid

The Danckwerts surface renewal model [2 l]then gives an equation for the rate of absorptionper unit area, R, g mole/cm2 set as,

R = c*d(Dk+ kL2) (2)Further when,

Dk B k,2 (24Eq (2) can be wntten as

where,V/(Dk) ~ [B] x IO-3

k, zc (1). R = c*d(Dk). (3)

D = dlffuslvlty of dissolved gas m aq HLS04solutions, cm2 lseck = first order or pseudo-first order reaction

rate constant, set-kL = physical absorption coefficient wlthoutchemical reaction, cmlsec

[Bl = concentration of the reactant in the bulkof solution, g mole/l

Thus, the specific rate of absorption underthese condltlons 1s a umque function of thephyslco-chemical propertles of the system and1s independent of the hydrodynamics of thesystem The absorption of tsobutylene m aque-ous sulphunc acid solutions therefore appearsto conform to absorption accomparned by fastpseudo-first order reactionDlffuswty of lsobutylene In aqueous sohons ofH.SQ

Z = number of moles of the reactant reacting Values of the dlffuslon coefficient of Isobuty-with one mole of the dissolved gas lene m water were determmed by using thec* = physical solublhty of lsobutylene m lammar Jet apparatus The dlffuslvlty of theelectrolyte solution, g mole/cm3 dissolved lsobutylene m water at 30C was found

Absorption of lsobutylene In aqueous solutions of sulphurlc acid

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J K GEHLAWAT and M M SHARMAto be 2 12 X 10e5 cm2/sec The drffustvttres ofolefins m the homologous senes (ethylene, por-pylene, butylenes etc ) appear to exhtbtt ananamolous behavrour. It would be expected thatthe dtffustvmes would decrease wtth mcreasmgmolecular weight However, the data of Unverand Htmmelblau[22] for the dtffustvttles ofethylene, propylene and butene-1 m water showthat the values of the dtffustvtty of butene-1 wereactually substanttally htgher than those of ethy-lene and propylene over the entire temperaturerange Investigated by them For example thereported values of the dtffustvtty respecttvely forethylene, propylene and butene-1 m water at 25Care 1 085 x 10e5, 0 681 X 10e5 and 6 612 X 10e5cm2/sec[22] The value of the dtffustvrty of ISO-butylene m water determmed by us, though verymuch lower than that of butene-1 , IS stgmficantlyhtgher than the values of ethylene and propylenereported by Unver and Hlmmelblau[22].

conventtonal analytical method because m actdof these concentrattons the rate of reaction 1squote small The phystcal solubthty of tsobuty-lene was, therefore, determmed analyttcally mlower concentrattons of aqueous acid soluttons(up to 40 per cent-53 g mole/l H2S04) and atrather lower temperatures (lOC, WC, and 25C)where the rate of reactton 1s expected to be slowThe solublhty of tsobutylene m water at 25C asdetermined m the present work 1s m good agree-ment with the reported values Our values are,however, about 20 per cent lower at 15C and10C than the values reported m Reference[23](The aqueous acid soluttons were saturated wtthtsobutylene m a bubbler and the phystcallydissolved rsobutylene was estrmated by thebromtde-bromate method used by Lucas andEberz[ 121 and others [25,26] ) The results aregiven m Table 1

Values of the dtffustvtty of tsobutylene maqueous soluttons of sulphunc acid wereesttmated by the expression

The solubthty data were correlated by thefollowmg equatton[27,28]log,, 2 = K,Z (6)

where,D = dtffustvtty of dissolved tsobutylene mm solution, cm2/secp = vtscostty of solution, CPT = temperature of solutton, K

Solubrbty of rsobutylene m aqueous solutrons ofH2SQ

The solubrhty data for tsobutylene m waterhave been reported by Taft, Purlee and DeFazro[13], Kazansku, Entehs and Chrtkov[23] andMcAuhffe[24] The solubrhty data of rsobuty-lene m aqueous soluttons of sulphurtc acrd arenot available m literature Smce the reactionbetween dissolved rsobutylene and H2S04 1sfast, the phystcal solubrhty of tsobutylene m thesulphunc actd concentrattons employed m thepresent study could not be determined analytrc-ally It was thought that the solubthty of ISO-butylene may be determined for H,SO, con-centratrons up to about 40 per cent wtlwt by the

where,K, = I+ + l_ + lg, l/g tonI = tonic strength of solutron, g ton/ 1C, = solubrhty of tsobutylene m water,g mole/cm3c * = solubthty of tsobutylene m aqueous solu-ttons of sulphunc acid, g mole/cm3

I = contrtbutlon of varrous species, l/g ton orI/gmole

The expression (6) was employed toextrapolatethe solubrhty data for acid concentrattons usedm this work It appears that aqueous soluttons ofH,SO, employed m thus study may be assumed tobe completely romzed[29]Physical mass transfer coeficrent

Approximate values of phystcal mass transfercoefficient, k, , are needed to check the condmongiven by expressions (1) and (2a) The k,, valuesat dtfferent speeds of stu-rmg were determmed mthe same s&red cell by absorbmg pure sulphurdtoxlde m water These values were used for1176


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Absorption of lsobutylene m aqueous solutions of sulphunc acidTable 1 Solublhty of lsobutylene m aqueous solutions of sulphunc acid at 760 mm Hg

Solublhty, g mole/cm3 K, I/g IonSolution 25C 15C 10C 25C 15C 10C

Water 49x10-a 62OxlO-B 79~10-~ - - -20% H,SO, (2 32 M) 3 IO x 10-B 3 80 x IO+ 4 8 x lo+ 00285 00305 0031130% H,SO, (3 72 M) 2 45 x 1O-B 2 90 x lo+ 3 65 x lo+ 0 0272 0 02% 0 030040% H$0,(5 31 M) 1 75 x lo-s 2 00 x 1O-B 2 45 x lO-B 0 0280 0 0305 0 0320Average values of K. = 0 028 0 030 0 031

checking expresstons (1) and (2a) after correctmgfor the effect of dlffuslvlty when used for SO-butylene aqueous H,SO, system by multlplymgthe values of kL for water by (DtCIHeg water/D,,p so1ut10n)05 It was assumed that the effectof viscosity on the hydrodynamics 1s mslgmfi-cant-that 1s- kL IS dependent on dlffuslvlty onlyat any given stirring speed (see below)For a sulphunc acid concentration of 10 25g mole/l, at 3OC, the specific rate of absorption,R, IS equal to 1.625 X lo- g mole/cm2 set, thesolublhty of lsobutylene m the acid solution ISequal to 5.85 X lo- g mole/cm3, and k ,_IS equal to1 1 x 10e3 cmlsec ThusDk = (R/ c*)~ = 7 7 X 1O-2 S k12 = 1.21 x 1O-6

Condltlon (2a) 1s satisfied For the above case,the value of q(Dk)/ k, and ([B] X 10V3)/(Zc*)work out to 252 and 17,500 respectively, mdlcat-mg that the condltlon gven by expression (1)for pseudo-first order reaction was also satisfiedEven d the assumed value of k, 1s m error by afactor of 3 the above condltlons are satisfied

Equation (3) was used to correlate the expen-mental data The pertinent values of c*d(Dk)and the reaction rate constant are gven m Table2 The values of the rate constant reported mTable 2 are only approximate as their accuracy 1sdependent on the accuracy of estimation of c*and D An error of 20 per cent m c* would resultm an error of about 45 per cent m the reactionrate constant The experimental values ofc*d(Dk) and the calculated values of the reac-tion rate constant have both been includedm Table 2 so that as more accurate values of c*and D become available, it will be possible torevise the tabulated values of the reaction rateconstantTaft [l l] found that the log of the reaction rateconstant for the hydration of lsobutylene maqueous mtnc acid solutions varied linearlywith the acidity function m solution concentra-tions from 0 09 to 5 g mole/ 1 The values of theacidity function for the sulphurlc acid solutionconcentrations empolyed m the present workwere taken from the paper of Paul and Long[30]

Table 2 Kmetlcs of absorption of lsobutylene m aqueous sulphunc acid solutions m the stlrred cellConcentration of

HSQ c*V(Dk), g mole/cm2 set Reactlon rate constant, k, see-% wtlwt gmole/l 30C 45C 60C 30C 45C 60C

49 5 70 0 195 x IO- 0 275 x lo- 0 364 x lo- 56 0 161 31455 5 8 175 0 395 x lo- 0 5145 x lo- 0 768 x lo- 487 1,325 4,440605 9 23 0 850 x lo- I 250x lo- 1 540 x lo- 4.440 16,350 43,20065 0 10 25 I 625 x lo- 2 395 x lo- 2 93 x 10-T 29,100 109x1os 283xloJ70 2 I1 50 425x10- - - 463xloJ -71 0 11 75 520x10- - - 7 87x lo5 - -

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The values of acldlty function are proportlonalto the molanty of the acid solutrons employedm this study A plot of log,, k agamst the con-centration of the aqueous solutions of H,SO,(g mole/l) gave a straght hne relationship(Fig 3) The data are correlated by

k = 4.1 x 10e5 exp 2-O [B] (7)where,

k = pseudo-first order reactlon rate constant,set-[Bl = concentration of acid solution, g mole/l

The apparent energy of actlvatlon was foundto be about 13.0 kcal/g mole for all the concentra-tions of sulphurlc acid mvestlgated m this workThis value of actlvatlon energy IS unhkely to bem error by more than 20 per cent

6 o r

J K GEHLAWAT and M M SHARMAby usmg this system agree reasonably well withthose obtamed Independently These data havebeen mcorporated m a paper by Jhaverl andSharma[32]Absorpt ion in u Bubble Column

IO I I I I I70 90 90 IO II 12

CBI g mole /IFtg 3 Effect of sulphurlc acid concentration on the rate

of absorption

Absorption in a packed columnPure lsobutylene was absorbed m 70 2 percent wt/wt aqueous H,SO, m a laboratory packedcolumn The column was the same as that usedby Vldwans and Sharma[31] The mterfaclaldrea wd? calculated by dlvldmg the total dbsorp-tlon rate by c d(Dk) determrned as aboveThe values of effective mterfaclal area obtamed

It has been shown by Sharma and Mashelkar[33] that m the case of a bubble column the effec-tlve mterfaclal area is a strong function of Ionicstrength and vlscoslty of the absorbent and thatIt Increases with an increase m the tome strengthand the vlscoslty of the solution Smce the VIS-coslty of sulphurlc acid solutions m the rangeof concentrations of 55-70 per cent wtlwtat 30C varies from 4 to 9 CP and the Ionicstrengths are also high (24-34 5 glen/l), itappears that a bubble column may prove to bean efficient contactor It was, therefore, thoughtdesu-able to absorb a refinery gas stream m 60 5per cent wtlwt aqueous H,SO, solution m abubble column The gas used m this work wasobtained from a local refinery and was analysedfor lsobutylene content by absorbmg the gas m60 5 per cent wt/wt H,SO, m an Orsat apparatusThe lsobutylene content was found to be 13 5per cent which checked well with the valuesupplied by the company (-13 per cent) The m-side diameter of the glass bubble column used was3.4 cm and the gas was introduced through a tubeof 6 mm m diameter In a run, 200 ml of 60 5 percent HLS04 solution were charged mto the bubblecolumn and the refinery gas was bubbled throughthe solution at a known flow rate for a knownperiod of time The amount of gas absorbed m agiven period of time was determined by notingthe Increase m the weight of the lmtlal chargeThe value of effectrve mterfaclal area m theabove bubble column for 60 5 per cent wtlwtH,SO, solution (p = 5 25 CP dt 30C) at a super-ficlal gas velocity of 18 cmlsec (dlsperslon height/column dla = 10) was found to be about 18 6cm2/cm3 of dlsperslon Sharma and Mashelkar[33] obtalned a value of effective mterfaclal aredof 5 2 cm2/cm3 at a superficial gas velocity of20 cm/set (dlsperslon height/column did = IO)when oxygen from air was absorbed m a solutioncontammg 0 8 g mole/l cuprous chloride+

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Absorption of lsobutylene m aqueous solutions of sulphunc acid5 g mole/l hydrochlonc acid+ 40 per cent wt/wtglycerol The vlscoslty of the solution was5 0 CP at 30C and the lomc strength 6 0 g ion/l

CONCLUSIONSThe reaction of the dissolved lsobutylene maqueous solutrons of sulphunc acid, m therange of concentrations empolyed mdustrlally(50-71 per cent wtlwt), was found to conform to

fast-pseudo-first order mechanism The datareported m the paper are hkely to provide arational basis for the design of industrial ab-sorbersAcknowledgment-One of us (JKG) wishes to thank theUmverslty Grants CornmIssIon for an award of a scholar-shrp which enabled this work to be carried out

NOTATIONa effective interfacial area, cm2/cm3[B] concentration of the reactant m the bulk ofsolution, g mole/l

C*

GD

Ik

R

solublhty of lsobutylene m aqueous acidsolutions, g mole/cm3solublhty of lsobutylene m water, gmole/

cm3ddfuslvlty of dissolved lsobutylene msolution, cmz/seccontrlbutlon due to vanous species,1 g ion or 1 g mole (see Eq 6)ionic strength of electrolyte, g ion/lfirst order or pseudo-first order reactionrate constant, set-physical absorption coefficient withoutchemical reaction, cmlsecsum of the contrlbutlon of the various

species, 1 g ion (see Eq 6)rate of absorption of gas per unit mterfaclalarea, g mole/cm2 settemperature of solution, Kviscosity of solution, cPnumber of moles of the reactant reactingwith one mole of the dissolved gas

REFERENCES[l] BAUMAN C P and SMITH M R , Petrol Engr I954 26 C-22, Petrol Refiner 1954 33 156[2] VALET A M , MICHAUX J P and BELLEE J J ,Petrol Refiner 1962 41 I 19[3] MARTEL E H , Chem Engng 1965 72 66[4] MARTEL E H , SCHREUDERS A, and MICHAUX J P , Chem Engng Prog 1965 6177[5] DAVISH S andSCHULERR ,J Am them Sot 193052 721,3769[6] NICOLESCU I and MODESTINU A, Reuta CJnw C I Parhon Pohteh But Ser Stunt, nat 1953 No 2 77, ChemAbstr 195650 17399[7] PIGULEVSKII V V and AVERINAM S ,Zh Pnkl Khlm 195730426,Chem Abstr 195751 13368[8] MUSHEUKO D V , VISHNEVAKII N E , DERGACHEVA R D and MALOV YU I, Zh Pnkl Khrm 1963

36 225 1,Chem Abstr 1964 60 7695[9] LIAKUMOVICH A G , SOBOLEV V M , MICHUROV YU I and PROKOFEV YA N ,Khrmlya Tekhnol Topl

Masell 10 5, Chem Abstr 196664 576[lOI LIAKUMOVICH A G , MICHUROV YU I and GUSHCHEVKII A B , Khlm Prom 1965 41 656, Chem Abstr196664 10991

[I I] TAFT R W ,J Am them Sot 195274 5372[ 121 LUCAS H J and EBERZ W F ,J Am them Sot 193456 460[ 131 PURLEE E L , TAFT R W and DEFAZIO C A J Am Chem Sot 1955 77 837[I41 GUPTAV P andDOUGLASW J M,AIChE.J1196713887[15] LASHMET, P K , Ph D Thesis, Umverslty of Delaware 1962, Chem Abstr 1963 58 8886[16] METZNER A B , LASHMET P K , and EHRREICH J E , Actes Intern Congr Catalyse, 2 Pans, 1960 1 735-46Dtscusston 747 (Pub 1961). Chem Abstr 196 I 55 23005[17] DAVIS H S , J Am them Sot 1928 50 2780[I81 JHAVERI A S and SHARMA M M ,Chem Engng Scl 196722 I[19] SHARMA M M and DANCKWERTS P V ,Chem Engng ScI 1963 18 722[20] JHAVERI A S and SHARMA M M ,Chem Engng Scl 1963 23 I[21] DANCKWERTS P V ,fnd Engng Chem 195143 1460[22] UNVERA A andHIMMELBLAU D M ,J Chem EngngDntcr 19649428

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]231t::;WI1271WIv911301r311

KAZANSKII K S ,ENTELISS G andCHIRKOVN M ,Zh FIZ Khrm 195933 1409McAULIFFE C ,.I Phys Chem 1966 70 1267MULLIKEN S P and WAKEMAN R L , Ind Engng Chem and~f Edn 1935 7 59DAVIS H S , CRENDALL Cl S and HIGBEE W S ,Ind Engng Chem An a l y t Edn 19313 108LONG F A and McDEVIT W F ,Chem Rev 1952 51 119VAN KREVELEN D W and HOFTIZER P J , Chrm Ind ,2 1 t Congress, Inst Chum Ind 1948DEN0 N C and TAFT R W ,J Am them Sot 1954 76 244PAUL M A and LONG F A ,Chem Rev 195757 1VIDWANS A D and SHARMA M M , Chem Engng Scr 1967 22 673[32] JHAVERI A S and SHARMA M M ,Chem Engng Scr 1968 23 669[33] SHARMA M M and MASHELKAR R A , Paper to be presented at the Tnparttte Conference at Montreal, Septem-ber 1968

J K GEHLAWAT and M M SHARMA

R&sum& La cmettque de ladsorbtton de ltsobutylene darts des soluttons aqueuses dactde sulfunque?I lmteneur de la gamme de concentratrons dtmportance mdustnelle a btC 6ttuhCe dans une celluleagrtee et un dlspostttf de Jet La constante du taux de reaction dordre pseudo prermer a une tempera-ture de 30C sest averee vaner entre 56 set- et 7,87 X l(r set- sur les concentrahons d&desulfunque de 49,5% (7,0 g mol/l) a 71 ,O% (1 I ,75 g mol/l) LCnergre dacttvatton apparente sestaver&e Btre de 13 O k&/g mol

Zusammenfassung-Dte Kmettk der Absorption von Isobutylen m wassngen Schwefelsaurelosungenm emem Konzentrattonsberetch von mdustneller Bedeutung wurde m emer Ruhrzelle und m ememStrahlgerat untersucht Die Geschwm&gkettskonstante bet 30C der Reakhon pseudo-erster Ordnungbewegte such von 56 set- bts 7,67 X 105 ee- uber den Konzentrattonsberetch der Schwefelsaure von49,5% (7,0 g mol/l) bts 7 1 O% (11,75 g mol/l) Dte wahmehmbare Akttvterungsenergte ergab such als13,O kcal/g mol

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h2so4 Stripping