The economics of converting hydrocarbons to motor fuel by this method vary \-iclcly. It is alniost obvious t.hat thc thrcc principal factors arc cost of feed stock, operating utilities, and cost of plant. It appears to be current practice to iippriiisc the cliarging stock at cquivalcnt fuel value on n 13.Th.U. basis. The type of plant, which fiscs capital cost, is substantially t,bat of a high prcssurc coil type cracking unit, with a highly efficient gas rccovcry and stabiliziition systcm. Tlie first two factors will vary widely with locat.ion. I'hilc in the paper previously referred to a case was cited iu which a manufacturing cost per gallon of 3.5 cents iviis given, realization statements for other plants show costs, cs-fuel charging stock, and depreciation, as s l o ~
iis 1 a?, cents per gallon.
Conclusions
(1). Based on estensivc sniall and large scalc laboratory development vork and the opcration of a fullscalc plant o \ w an cstendcd period of time, it is apparent that feed stocks consisting of pure propaue and butnnc, cithcr alone or with their rcspcctivc unsaturates iiud with certain nmouuts of ethane, may be convcrtcd by inenus of lieat nnd prcssurc to liquids boiling substrintinlly iu the motor fuel ritngc.
(2) Liquid yiclds of over 14 gal. (net) pcr 1000 cb. ft. of gaseous feed (tiOo I?. and 30 in. iucrcury) niay bc obtained with either high or lo\. voliitility iind having octiiiie-i)Iciitliiig v:ducs vi1rying frOJn SO to over 120 C.F.R. motor mcthod.
(3) Polynicrizntion iind criicking may hc en'ectctl siniultnncously by proper choice of coiitli tions. Y!hc rclativc rates of cracking iind polynicriziition may I)c so controlled that t,lic rcquircd olefin protluct,ion for re-cycling may bc obtaiiicd without siibstnntiiil (4) One coninicrcid I)liitlt of this type is in opcriition, n second is c s p t e d to start in a fern \vecks, and the cnginecriiig of five niore is activcly in process. naphtha dcgriltliition. REFERENCES 1 l'lic JI. IV. licllogp Co., Jersey City, N..J. 2 l'nper cntitlctl " l'lic Clicniititiy of Chis Crricking nnd Polynicrizntion," presciltctl by Ur. I'er I<. I~rolich. 3 l'apcr prcscntctl to tlic Kovcnilcr 1O:i6 Jlrctii1g of tlic. Anicricrin l'c*trolculn Jnstitutc, cntitlctl i' Tlic Tlicrulnl Converiiion of Ilytlrocnrl>on Giiscs to G;~suliiic," by 1'. C. licitli, Jr. niid J. T. IViird. 4 Tlic process Item corisidrrcd, nrid clcaign;ttctl~is tlic irnituv thcriiinl process, is licciised by tlic I'olynicrizntioii I'rocesa Corporation, throngli its licensing agent t11c 31. \V. 1Ccllogg Co., under tlic pntcnts iipplyiitg to this process of thc I'liillips l'ctrolcuin Co., Llic Stnntld Oil Co. (Intliitnn), Strintlard Oil Cu. of Xcn Jersey, tlic Tcsas Co., nntl tlic Jl. \V. liellogg Co. Tlic pliints utilizing this process itre constrtrctcd by tlic