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1659verted to new type of operation; low temperature regeneration allows use of ordinary steel and keeps corrosion at a minimum; and odor nuisance during regeneration is eliminated, since disulfides are formed as a by-product. CONCLUSIONSThe use of mercaptan oxidation catalysts, soluble in alkaline treating reagents, offers an attractive, economical means of regenerating solutions used in the removal of mercaptans from gasoline. The ease of regeneration possible through the use of oxidation catalysts materially improves operations of mercaptan extraction systems. ACKNOWLEDGMENTThe authors wish to express their appreciation to J. B. Rather of Soconv-Vacuum Oil Company, Inc., for permission to publish this paper. Since the paper was originally offered for publication, arrangements have been made with the Shell Development Company for the joint licensing of Shell's solutizer process incorporating the described tannin-catalyzed air regeneration technique, the combination being known as tannin solutizer process. The authors also wish to acknowledge the assistance of members of that organization as regards information on the more recent commercial applications.

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The absorpt ion spectra of native , merceri zed , a nd amorph ous cell uloses a re recorded fo r t he regio n from 2 to 16 microns. Cell ulose having t he X -ray diffra ction p atte rn of the native, or ty pe I , cr ystal lattice is rep rese nted in t h is st udy by bacte ri a l cellulose, cotton fi bers, Valoni a cell wall , an d t he resid ue fr o m t he h ydrolys is of cotton linters . Cell ulose havin g t he X -ray d iffra ction patter n of t he m erceri zed , or type II, cry stal lattice is represe nted by rege nerated cellulose, t h e residue fr o m t he metha nolys is of mer ceri zcd cot.to n l inters, an d merceri zed bacte ri al cell ulose. Amorph ous cell ulose ' \"as o bt ained by milli ng t he resid ue fro m t he h ydrolys is of cotton lin ters in a v ibrato ry ba ll mi ll.T he spectra of t he type I cellu loses s howed s ha rpcr and tTl.ore clearly defin ed a bsorp t ion bands than t he sp ectra of t h e t yp e II celluloses . The most st rikin g differen ces were found in t he 7-to 8-a nd 9-to 10-micro n regions . In the forme r region of t he sp ectrum of typ e I cellul oses, defini te absorp tion maxim a of n earl y equal int ensity \Y ere fou nd at a ppro ximately 7.0, 7.3, 7.4, a nd 7.5 m icr ons. In t he sp ectrum of ty p e II cell ul oses, t he maximum a t 7. 4 mi crons was lac kin g, while t he a bsorption at 7.3 mi crons \\" as considera bl y more inte nse t han t hat a t 7.0 a nd 7. 5 mi cr ons. Observat io ns in t he 7-to 8-mi cron region of t he s pectrum of t he amor p hous cellul ose were preve nt ed by t he usc of a suspe ndin g medium t hat a bsorbed in t hat region. In t he 9-to 10-micro n region , defini te a bsorp t ion m a xima \\"ere found at approx imately 9.0, 9.4, and 9. 6 micron s wi t h t he typ e I cell ul oses. \Vhen ce llulose I wa s converte d into cellulose II or a morphous ce llulose, t hese ma xima mer ged int o a sin gle b r oad ba nd . Conversio n of cellulose I into cellulose II or a mo rphous cellulose a lso resul ted in an increa se in t he in te ns ity of t he absorpt ion at 11 .2 mi crons. Although factors other t han decrease in type I cry st allini ty may co nt ribu te to t hese cha nges in a bsorption characteris tics, t he ch anges may prove usefu l in evaluat in g cha nges in cr ystalline st ru cture of cellulose .• A report of work done under cooperative agreement with t he U ni ted States Department of Agr iculture and aut horzed by the R esearch and Marketing Act. 'rhe work is being su pervised by the Sonthern R egional R esearch Laboratory of t he Bureau of Agri cultural a nd In d ustrial Chemistry.