ExxonMobil

About: ExxonMobil is a company organization based out in Irving, Texas, United States. It is known for research contribution in the topics: Catalysis & Polymer. 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..

Viscoelastic Property Mapping with Contact Resonance Force Microscopy

Abstract: We demonstrate the accurate nanoscale mapping of near-surface loss and storage moduli on a polystyrene–polypropylene blend with contact resonance force microscopy (CR-FM). These viscoelastic properties are extracted from spatially resolved maps of the contact resonance frequency and quality factor of the AFM cantilever. We consider two methods of data acquisition: (i) discrete stepping between mapping points and (ii) continuous scanning. For point mapping and low-speed scanning, the values of the relative loss and storage modulus are in good agreement with the time–temperature superposition of low-frequency dynamic mechanical analysis measurements to the high frequencies probed by CR-FM.

Low emission power generation and hydrocarbon recovery systems and methods

Abstract: Methods and systems for low emission power generation in hydrocarbon recovery processes are provided. One system includes integrated pressure maintenance and miscible flood systems with low emission power generation. An alternative system provides for low emission power generation, carbon sequestration, enhanced oil recovery (EOR), or carbon dioxide sales using a hot gas expander and external combustor. Another alternative system provides for low emission power generation using a gas power turbine to compress air in the inlet compressor and generate power using hot carbon dioxide laden gas in the expander. Other efficiencies may be gained by incorporating heat cross-exchange, a desalination plant, co-generation, and other features.

Method for isomerizing wax to lube base oils

Abstract: Slack waxes and synthetic wax are isomerized and processed into high viscosity index and very low pour point lube base stock oils and blending stocks by the process comprising the steps of hydrotreating the wax, if necessary, to remove heteroatom and polynuclear aromatic compounds and/or deoiling the wax, if necessary, to an oil content between about 5-20% oil, isomerizing the wax over a Group VI-Group VIII on halogenated refractory metal oxide support catalyst, said isomerization being conducted to a level of conversion such that ˜40% and less unconverted wax remains in the 330° C. + , preferably the 370° C. + fraction sent to the dewaxer. The total isomerate from the isomerization unit is fractionated into a lube oil fraction boiling at 330° C. + , preferably 370°p9 C. + . This oil fraction is solvent dewaxed preferably using MEK/MIBK at 20/80 ratio and unconverted wax is recycled to the isomerization unit. Operating in this manner permits one to obtain isomerate oil of very high VI (in excess of 130) possessing low pours (-21° C., preferably -24° C., most preferably -27° C.).

Morphology and miscibility of miktoarm styrene-diene copolymers and terpolymers

Abstract: The microphase separation of new miktoarm styrene-diene (isoprene or butadiene) copolymers is examined. At the molecular weights studied, the polystyrene (PS) arms always separate from the polydienes, but the polyisoprene and polybutadiene arms mix when they occur in the same molecule. On the other hand, the miktoarm architecture does not seem to strongly affect the kind of microphase-separated domains that are formed in these polymers. The polymers with a single PS arm and two polydiene arms formed PS cylinders, whereas a lamellar or bicontinuous structure would have been expected from literature on linear block copolymers