... by late transition metals is currently of interest. Metal Catalysts for the Oligomerization of Ethylene: 2.a. Nickel: In recent years nickel complexes have attracted increasing interest as effective catalysts for short chain olefin polymerization, including ethylene oligomerization. Catalysts for ethylene...

... to the stereospecific polymerization of olefin mixtures K. WEISSERMEL: In respect to the polymers, are there some differences whether you start with Cis or tram or with a mixture of Cis and trans 4-methylpentene-2. Y. CHAUVIN: The results are nearly the same. G. WILKE: I would like to meke the following remark...

... triphenylphosphine Catalyst System Ethylene Chexadiene reaction mMole hydride selectivity acetylacetonate diphosphine ethylene pressure butadiene cobalt polymerization chloride synthesis triethylaluminum hexadiene conjunction Polymerization in Conjunction with Petroleum...

... for isolating isoprene. Polymerization of this isoprene with catalyst systems capable of yielding stereospecific polymers has given Cis-polyisoprene equivalent in physical properties to natural rubber. Résumé L'isoprène est préparé à partir du propylène par un procédé qui comporte de troi réactions de...

... petrochemical unité industrielle Ethylene ethane polymerization olefin manufacture sur Propylene craquage Johnson panel discussion Hernandez Germany operation que dimerization selectivity PANEL DISCUSSION PRODUCTION OF OLEFINS FOR MANUFACTURE OF PETROCHEMICALS CHAIRMAN : J. FOUCHIER (Frunce...

.... Chukovskaya, A. B. Belyavsky, B. A. Englin, and A. B. Terentiev. ?Translated by A. L. Pumpiansky chloroform polymerization initiator Ethylene Akad ethylene telomerization carbon tetrachloride chain transfer molecule telomerization peroxide Chem reaction cci Compound acid Freidlina...

... Abstract Olefins with internal double bond are polymerized to high molecular weight products, by adding an organometallic compound able to insure the migration of their double bond, to a usual olefin polymerization catalyst; the isomerization equilibrium is displaced by polymerization of the I...

... metal and that use of polypropylene, and good electrical insulating properdifferent alkali metals gave substanti Downstream Oil & Gas particle diameter organopotassium compound reactor polymerization induction period potassium Propylene catalyst support slurry catalyst catalyst...

.... The chemical properties of bis (x-ally1)-nickel should be analogous to those of the intermediate. Bis(x-ally1)-nickel could in fact be prepared as a yellow orange, crystalline, and volatile 351 352 Polymerization in Conjunction with Petroleum Raw Materials compound through the reaction of allylmagnesium...

... concentrations moyennes on obtient l'adiponitrile avec un rendement presque quantitatif; dans un milieu presque anhydre, la reaction donne un hydrotrimère, un hydrotetramère ainsi que des polymères d'acrylonitrile aux bas points de fusion. On discute le mode de formation probable de cette gamme des produits. La...

... in general will first be reviewed, followed by a summary of each major commercial refining process involving carbonium ions ; i.e., alkylation, polymerization, catalytic cracking, hydrocracking and reforming. Where noteworthy, attention will be called to techniques used by the pro- cess design engineer...

... propositions suiwas esters of highly unsaturated polyene acids. vantes: la source principale de la kérogène est des Kerogen formation was essentially polymerization, esters d'acides polyènes fortement insaturés, la forcondensation and, initially, oxidation of these acids. mation de la kérogène est...

... catalyst ingredient new rubber rubber industry strength physical property characteristic carbon black resistance cispolybutadiene natural rubber SBR butadiene manufacturer petroleum industry acceptance polymerization producer raw material synthetic rubber Abstract. Cis...

... Abstract. Refinery alkenes containing more than four carbon atoms have been investigated as potential low-cost comonomers for incorporation into copolymer and terpolymer resins based on acrylonitrile. Such olefins do not homopolymerize under the usual conditions for freeradical polymerization...

... de matériaux monomériques utilisés pour des fibres synthétiques est estimée à 400 millions de dollars. I1 paraît qu'il y a assez de matières premières pour satisfaire les demandes prévues. Des mesures détaillées pour la synthèse des monomères, leur transformation en polymères et la filature de ces...

... des dérivés du pétrole en Europe Occidentale, quelques nouveaux polymères des oléfines et des dioléfines, qui ont été réalisés au cours de ces dernières années en Italie, sont pas& en revue. Introduction The chemistry of petroleum derivatives, which has so greatly enlarged the potential field...

...Section IV-Paper 25 SOME RELATIONSHIPS OF POLYMERIZATION OF ALPHA-OLEFINS ON COMPLEX ORGANOMETALLIC AND OXIDE CATALYSTS BY A. V. TOPCHIEV AND B. A. KRENTSEL ABSTRACT. Analysis of published data as well as the results of experimental studies of the stereospecific polymerization of propylene...

...Section Iy-Paper 26 THE POLYMERIZATION OF ACETYLENE AND HOMOLOGUES BY ALFRED CLARK,* J. P. HOGAN, D. R. WITT,* AND W. C. LANNING* ABSTRACT. Acetylene has been polymerized over a chromium trioxide-silica-alumina catalyst to give high yields of benzene. From a survey of reaction conditions...

...) , produced by the addition of water to MVA, and cyanobutadiene, produced by addition of hydrocyanic acid to MVA (Table I) . All these impuri- ties are unsaturated. Therefore, they can severely dis- turb the polymerization and reduce the quality of the polyacrylonitrile. On that account they must be re- moved...

...Section III-Paper 21 CONJUNCT POLYMERIZATION OF ETHYLENE WITH HETEROPOLY ACID CATALYSTS BY J. W. KLINKENBERG AND H. I. WATERMAN ABSTRACT. Acid catalysts consisting of a heteropoly acid, preferably silicotungstic acid or phospho- tungstie acid, supported on silica gel proved to be very active...