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Institution

ExxonMobil

CompanyIrving, Texas, United States
About: ExxonMobil is a company organization based out in Irving, Texas, United States. It is known for research contribution in the topics: Catalysis & Polymerization. The organization has 16969 authors who have published 23758 publications receiving 535713 citations. The organization is also known as: Exxon Mobil Corporation & Exxon Mobil Corp..
Topics: Catalysis, Polymerization, Polymer, Hydrocarbon, Alkyl


Papers
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Patent
14 Feb 1979
TL;DR: In this article, the authors describe derivatized ethylene copolymers derived from about 2 to 98 wt.% etyhlene, and one or more C3 to C28 alpha-olefins, which are grafted, preferably solution-grafted under an inert atmosphere and at elevated temperatures and in the presence of a high-temperature decomposable free-radical initiator.
Abstract: OF THE DISCLOSURE Oil-soluble, derivatized ethylene copolymers derived from about 2 to 98 wt.% etyhlene, and one or more C3 to C28 alpha-olefins, e.g. propylene, which are grafted, preferably solution-grafted under an inert atmosphere and at elevated temperatures and in the presence of a high-temperature decomposable free-radical initiator, with an ethylenically-unsaturated dicarboxylic acid material and thereafter firstly reacted with from 0.1 to 0.9 molar equivalents of a t-amino-amine compound containing only one primary amino group to form imido groups and then secondly reacted with from 0.1 to 0.9 molar equivalents of a .alpha.,.omega. primary diamine having at least two primary amino, groups, e.g. a poly(alkylene amine) such as diethylene triamine, to form carboxyl-grafted polymeric imide, usually succinimide, intermediate and thirdly reacted with an anhydride of a C1-C30 hydrocarbon sub-stituted acid, preferably acetic anhydride, to yield an oil-soluble stable amidederivative of said polyamine whereby oil solutions of said amide derivative are characterized by minimal viscosity change over an extended period of time. Useful number average molecular weight (?n) of said copolymers range from about 700 to 500,000 however, if the molecular weight is from 10,000 to 500,000 then these copolymers are multifunctional viscosity index improvers of enhanced sludge dispersant activity. It is preferred to treat these derivatized copolymers with oil-soluble hydrocarbyl substituted acids, preferably with long chain alkylaryl sulfonic acids with an average side chain carbon number of about 20-40, to yield haze-free hydrocarbon concentrate useful as an additive solution for lubricating oils.

141 citations

Journal ArticleDOI
TL;DR: Viscoelasticite de fractions de M comprise entre 1.9•10 4 and 3.9 • 10 4 ; synthese et caracterisation de solutions diluees de fractions d'Akron, comparaison avec les donnees de la litterature as mentioned in this paper.
Abstract: Viscoelasticite de fractions de M comprise entre 1,9•10 4 et 3,9•10 4 ; synthese et caracterisation de solutions diluees de fractions d'Akron, comparaison avec les donnees de la litterature

141 citations

Journal ArticleDOI
TL;DR: In this article, a mechanistic model for hemicellulose pyrolysis was constructed based on the reaction family approach that we used for cellulose pyroglysis before.
Abstract: Hemicellulose is one of the major components of lignocellulosic biomass, which is an abundant source of renewable carbon on the Earth and has potential for the production of renewable drop-in transportation fuels and multiple commodity chemicals. In this work, a structure for hemicellulose extracted from corn stover was proposed to capture the experimentally characterized structural properties. A mechanistic model for hemicellulose pyrolysis was constructed based on the reaction family approach that we used for cellulose pyrolysis before. The model described the decomposition of hemicellulose chains, reactions of intermediates, and formation of a range of low molecular weight products (LMWPs) at the mechanistic level and specified rate constants for all the reactions in the network. Overall, 504 reactions of 114 species were included in the mechanistic model for fast pyrolysis of extracted hemicellulose. The mechanistic model closely matched experimental yields of various products with mass yield ≥1 wt%. Modeling results show that both the degree of polymerization and the polydispersity index of hemicellulose have an insignificant effect on the pyrolysis product distribution. Then, the mechanistic model of extracted hemicellulose is further extended to simulate the fast pyrolysis of native hemicellulose. Comparison of the model results showed that fast pyrolysis of native hemicellulose from corn stalk yielded more char, gaseous species, acetol, and much more acetic acid than that of extracted hemicellulose from corn stover, while yielding less 1,2-anhydroxylopyranose, 1,2;3,4-dianhydroxylopyranose and glycolaldehyde.

141 citations

Patent
08 Jul 2005
TL;DR: In this article, a process to polymerize olefins comprising contacting, in a polymerization system, olefs having three or more carbon atoms with a catalyst compound, activator, optionally comonomer, and optionally diluent or solvent, at a temperature above the cloud point temperature of the polymeric system and a pressure no lower than lOMPa below the cloud-point pressure of the polymerisation system is described.
Abstract: This invention relates to a process to polymerize olefins comprising contacting, in a polymerization system, olefins having three or more carbon atoms with a catalyst compound, activator, optionally comonomer, and optionally diluent or solvent, at a temperature above the cloud point temperature of the polymerization system and a pressure no lower than lOMPa below the cloud point pressure of the polymerization system, where the polymerization system comprises any comonomer present, any diluent or solvent present, the polymer product, where the olefins having three or more carbon atoms are present at 40 weight % or more, wherein the catalyst compound is a bridged metallocene based on indenyl groups.

140 citations


Authors

Showing all 16987 results

NameH-indexPapersCitations
David A. Weitz1781038114182
Avelino Corma134104989095
Peter Hall132164085019
James A. Dumesic11861558935
Robert H. Crabtree11367848634
Costas M. Soukoulis10864450208
Nicholas J. Turro104113153827
Edwin L. Thomas10460640819
Israel E. Wachs10342732029
Andrew I. Cooper9938934700
Michael J. Zaworotko9751944441
Enrique Iglesia9641631934
Yves J. Chabal9451933820
George E. Gehrels9245430560
Ping Sheng9059337141
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20234
202236
2021302
2020340
2019366
2018438