Showing papers by "Mobil published in 1979"

Coextruded thermoplastic stretch-wrap

Abstract: This present invention relates to novel coextruded thermoplastic film and the employment of such multi-layer film as stretch-wrap material for packaging of goods, including relatively large palletized loads of material. More specifically, such coextruded stretch-wrap films comprise three-layer laminations having a relatively thin skin layer and a relatively thicker core layer. Suitable skin layers include highly-branched low-density polyethylene, and suitable core layers include linear low-density polyethylene co-polymers, such as ethylene co-polymerized with a minor amount of at least one C 4 to C 10 alpha-olefin, such as octene-1 and 4-methyl-pentene-1, and butene-1.

Encapsulated solar cell array

Abstract: Solar cell array and method for manufacturing same wherein the individual cells of the array are sandwiched and held resiliently captive between and electrically isolated from a transparent protective front cover and a protective rear substrate by an encapsulating transparent silicone elastomer cast in situ in the interstices between the cover, the cells, and the substrate, the elastomer being introduced, while fluid, into the sandwich through the same terminals used for the electrical connection of the array to its electrical load.

Calculated temperature distribution during laser annealing in silicon and cadmium telluride

Abstract: By solving the time-dependent heat flow equation, the temperature reached by silicon and cadmium telluride surface layers under high power density ruby laser pulsed illumination, is calculated. The results are presented in directly useful figures allowing the determination of the surface temperature, its evolution towards the bulk as a function of time... In particular, it should be noticed that for a 25 ns half-power width, pulses of 0.8J/cm2 are sufficient to melt the top of an amorphous silicon layer, this value becomes noticeably lower for cadmium telluride.

Process for separating ethylene from light olefin mixtures while producing both gasoline and fuel oil

Abstract: A process is disclosed for separating ethylene in admixture with light olefins by contacting said olefinic mixture under very critical reaction conditions over a special catalyst, such as a zeolite of the ZSM-5 type so as to selectively react the C3 and higher olefins and convert the same to both gasoline and fuel oil.

Polypropylene film with primer of a water dispersed epoxy resin coating

Abstract: Thermoplastic films, such as polypropylene, are coated with a vinylidene chloride based multipolymer to enhance the physical properties of such films. The coating is anchored to the base film by first applying a primer coating directly on the film surface, which primer coating comprises a water dispersed epoxy resin composition.

Flow of non-Newtonian power law fluids through porous media

Abstract: The partial differential equation is derived that describes the flow of non-Newtonian power law slightly compressible fluids in porous media. An approximate solution, in closed form, is developed for the unsteady-state flow behavior and verified by 2 different methods. Using the unsteady-state solution, a method for analyzing injection test data is formulated and used to analyze 4 injection tests. The theoretical results were used to derive steady-state equations of flow, equivalent transient drainage radius, and a method for analyzing isochronal test data. The theoretical fundamentals of the flow of non-Newtonian power law fluids in porous media are established. (10 refs.)

Catalytic dewaxing of lubes in reactor fractionator

Abstract: Heavy petroliferous stocks such as vacuum and atmospheric resids, tar sand oils, shale oils, liquids from conversion of coal and the like are concurrently distilled and hydroprocessed for removal of sulfur, nitrogen and metals and are hydrocracked or otherwise hydroprocessed in a packed distillation column under hydrogen pressure wherein the packing is constituted, at least to a substantial extent in both stripping and rectifying sections by catalyst suited to the desired conversions. In a specific application to catalytic hydrodewaxing of lubricating oil stocks, improvement of Viscosity Index (VI) of dewaxed product results.

Preparation of 2-phenylalkanes

Abstract: A process for the selective alkylation of substituted or unsubstituted benzene compounds with relatively long chain length alkylating agents to produce phenylalkanes having an improved yield of the 2-phenylkane isomer. The reaction is carried out in the presence of crystalline zeolite catalysts characterized by channels or networks of pores having openings with a major dimension of 6-7 angstroms.

Crystalline zeolite product constituting ZSM-5/ZSM-11 intermediates

Abstract: A new crystalline aluminosilicate zeolite product is provided having a structure intermediate that of ZSM-5 and ZSM-11, having a characterizing X-ray diffraction pattern and having a unit cell parameter of at least about 40 Angstroms. There is also provided a method for synthesizing the new zeolite and a process for using the same as a catalyst in effecting conversion of organic compounds.

Marine production riser system and method of installing same

Abstract: A free-standing, marine production riser and a method of installing same for use in deep-water areas to conduct fluids between the marine bottom and the surface. The riser system is comprised of a lower rigid section and an upper flexible section. The lower rigid section has a casing extending from a preset base on the marine bottom to a point just below the zone of turbulence which exists near the surface of the water. A variable-buoyant buoy having a curved upper surface and a central passage therethrough is mounted on the upper end of the casing to support the casing in a substantially vertical position when the casing is in position on the preset base. A remotely actuated connector assembly is provided on the lower end of the casing for connecting the casing to the preset base. A plurality of conduits are run through the passage in the buoy and through guide means in the casing and are remotely connected to mating conduits on the base. Each of a plurality of flexible flowlines is connected to a respective conduit at a point within the passage in the buoy. Each of the flexible flowlines is of sufficient length to extend over the upper curved surface of the buoy which provides a natural bending radius for the flexible flowlines and then downward through a catenary loop before extending upward to the surface. The flowline length also will be sufficient to maintain a catenary loop in the flowline at all times during normal operating conditions. All of the upper ends of the flexible flowlines are connected to a single flange which, in turn, is adapted to be quickly connected to and disconnected from a floating facility at the surface. In turn, each flexible flowline can be individually installed and/or removed.

Fluid zeolite catalyzed conversion of alcohols and oxygenated derivatives to hydrocarbons by controlling exothermic reaction heat

Abstract: Alcohols and related oxygenates converted in a riser reactor and dense fluid catalyst bed (ZSM-5 cat) circulated through a plurality of satellite stripping-cooling zones for temperature control. Catalyst utilized comprises from 5 to 20 weight percent coke for activity and selectivity characteristics promoting the formation of olefins and aromatics at temperatures below 800° F.

Production of high V.I. lubricating oil stock

Abstract: Waxy distillate lubricating oil stocks suitable for the preparation, by conventional unit processes, of high V.I., low pour point lubricating oils, are advantageously catalytically dewaxed with macrocrystalline ZSM-5 (crystallites larger than 2 microns) preferably associated with a hydrogenation metal such as platinum or palladium.

Nickel plating method

Abstract: A simple method for plating nickel onto silicon which renders unnecessary any catalyzing pretreatment of the silicon surface which is to receive the nickel. The method comprises the immersion of a silicon substrate in a suitable nickel bath in order that nickel ions in the bath will be reduced to solid nickel and deposited onto the substrate so as to form an adhering layer thereon. The method is especially advantageous in plating nickel onto silicon shallow junction devices for the purpose of providing ohmic contacts.

Hydrodewaxing catalyst performance

Abstract: A method is disclosed for the improvement of catalyst performance in catalytic hydrodewaxing of both petroleum and synthetic hydrocarbon feedstocks utilizing a special group of acidic crystalline aluminosilicate zeolites such as those of the ZSM-5 type which involves treatment of said zeolites in order to adjust their initially high alpha activity to within a range of 55-150 alpha prior to use as catalysts in a hydrodewaxing operation.

De-aluminization of aluminosilicates

Abstract: A process for the de-aluminization of aluminosilicates such as zeolites, clays, gels, amorphous silica-aluminas and crystalline silica-aluminas. The process comprises contacting an aluminosilicate with an inorganic halide or oxyhalide at a temperature sufficiently high enough to volatilize the aluminum halide or oxyhalide which is formed.

Laboratory Investigation of Fracture Initiation Pressure and Orientation

Abstract: The mechanics of hydraulic fracture initiation has been investigated in a combined experimental-theoretical study. Theory was developed assuming poro-elastic behavior. Experiments were conducted with 4-inch diameter cores containing spherical and cylindrical cavities and loaded in a triaxial cell under variable confining pressure, end load and pore pressure. Experimental results agreed with theory for nonpenetrating frac fluid over limited ranges of hydrostatic confining stresses for four kinds of rock. With penetrating frac fluids the theory was only partially confirmed. Under non-hydrostatic stress conditions, reproducibility of measurements was too poor to evaluate the theory. Fracture orientation was controlled predominantly by stress conditions and cavity geometry. Notching of cylindrical cavities gave failure through notch extension only if the notch depth exceeded the value predicted approximately by a simple Griffith theory equation. Field applications of all results are discussed.

Bioepigenetic sulfur deposits

Abstract: Isotope analyses distinguish biogenic sulfur deposits from nonbiogenic deposits but do not distinguish bioepigenetic from biosyngenetic deposits. Sulfur deposits in cap rocks over salt domes and in bedded Permian evaporites of West Texas, however, are clearly bioepigenetic. Anhydrite, introduced by salt diapirs into geologically younger sediments, is converted biogenically to sulfur and calcite in the presence of petroleum in cap rock over the Challenger Knoll, a salt dome at a water depth of 12,000 ft in the Gulf of Mexico. Bedded evaporites of West Texas in association with petroleum show an obvious epigenetic displacement of the anhydrite layers by biogenic sulfur and calcite.

Method and apparatus for measuring a component in a flow stream

Abstract: A method and apparatus for measuring the concentration of a particular component, e.g. water, in a two-component mixture, e.g. water-oil. A probe having three sets of sensor electrodes is positioned into the mixture. A first elastic sac is secured over the exposed ends of a first set of electrodes and is filled with water. A second elastic sac is secured over the exposed ends of a second set of electrodes and is filled with oil. The ends of the third set of electrodes are left exposed. The electrodes are energized and each generate a signal representative of a measured electrical property, e.g. resistivity, conductivity, or capacitance, of the liquid in which they are immersed. By properly combining these three signals, the concentration of the particular component is determined. Since any changes in temperature and pressure in the mixture being measured with affect the readings from all three sensors equally, the probe is considered self-adjusting and the accuracy of the final measurement is relatively unaffected by these changes.

Manufacture of aromatic compounds

Abstract: Isomerization of xylenes admixed with other alkyl aromatics of at least eight carbon atoms is conducted at essentially atmospheric pressure at 800°-1000° F. with a zeolite like zeolite ZSM-5 of reduced acid activity.

Manufacture of nitrogenous zeolites

Abstract: A process for manufacturing synthetic nitrogenous zeolites such as ZSM-5 in which the shape or some other feature of the microscopic crystals is controlled by including in the forming solution an organic basic nitrogen compound in addition to the organic nitrogenous template.

Method and apparatus for thermoforming thermoplastic foam articles

Abstract: A method and apparatus for thermoforming plastic foam articles comprising the sequential steps of (a) preheating the plastic foam, usually supplied in the form of a continuous sheet stock, (b) clamping, in a fixed position, that portion of the stock material which is to be thermoformed, (c) initially deforming the preheated foam stock with a portion of a male mold member to form a preform, (d) drawing a vacuum on the interior of the female mold member to assist in completion of the thermoforming operation, and (e) completing formation of the desired article by deformation of the preform between a male and female thermoforming device.

Heat disposed in lower alcohols and derivatives conversion to gasoline hydrocarbons in a crystaline zeolite fluidized bed

Abstract: A method and means for disposing of undesired heat in the conversion of lower alcohols and their derivatives to higher boiling gasoline hydrocarbons in a crystalline zeolite fluidized bed.

Process for deasphalting hydrocarbon oils

Abstract: Hydrocarbon oils such as residual petroleum oils are efficiently deasphalted and demetallized with recovery of high quality asphalt by contact with a liquid mixture of at least two of the components selected from hydrogen sulfide, carbon dioxide and propane. The recovered deasphalted oil, which is characterized by reduced metal and sulfur content, may be used as charge stock to the fluid catalytic cracking process or to the hydrocracking process.

Process for repairing asphalt pavement

Abstract: This invention provides a process for repairing and surfacing broken asphalt pavements which involves applying to the distressed pavement a binder composition which has exceptional solvating power for asphaltic material, and which functions to solubilize and incorporate aged pavement asphalt into the binder composition as it penetrates and fills void spaces. Illustrative of a preferred binder composition which is applied to the distressed pavement is a homogeneous blend of (1) a FCC main column bottoms residuum boiling above about 650° F., and (2) an asphalt-soluble elastomer which improves the elasticity and wear resistance of the binder composition.

Synthesis of pyridine and alkylpyridines

Abstract: A method is provided for synthesizing pyridine or alkylpyridines by reacting ammonia and a carbonyl reactant which is an aldehyde containing 2 to 4 carbon atoms, a ketone containing 3 to 5 carbon atoms or mixtures of said aldehydes and/or ketones under effective conditions in the presence of a catalyst comprising a crystalline aluminosilicate zeolite having a silica to alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12 and recovering from the resulting reaction mixture, a product containing at least one compound of pyridine or an alkylpyridine. Addition of methanol and/or formaldehyde to the feed improves selectivity to unsubstituted pyridine.

Hydrocarbon conversion catalyst

Abstract: In a process for converting a high boiling hydrocarbon charge fraction to liquid products of lower boiling range which comprises contacting said charge fraction with a crystalline zeolite characterized by a silica/alumina ratio greater than 12, a constraint index between about 1 and about 12 and an acid activity measured by the alpha scale less than 10, said contacting being conducted at 650° to 850° F., space velocity of 0.1 to 5.0 LHSV and a pressure not less than about 200 psi, the improvement which comprises utilizing, as catalyst, a zeolite of the above character that is prepared by steaming followed by base exchange to substantially eliminate its activity for cracking n-hexane.

System for deploying and retrieving seismic source assembly from marine vessel

Abstract: A system for deploying and retrieving a seismic source assembly from a marine seismic vessel. The system comprises a guide track which is secured to the underside of an upper deck of the vessel. The chain which absorbs most of the strain due to towing passes through the track and is safely confined therein during the deployment and retrieval of the source assembly. A connector is attached to the chain at each point where a seismic source and a buoy line is to be attached. As the chain is unreeled and as each connector approaches the track, a source and a buoy line is attached to that respective connector. The track is constructed so a connector on the chain with both a source and a buoy line attached can pass therethrough. This procedure is continued until the seismic source assembly is deployed. The procedure is reversed to retrieve the source assembly.