Mobil

About: Mobil is a based out in . It is known for research contribution in the topics: Catalysis & Zeolite. The organization has 7085 authors who have published 10642 publications receiving 237497 citations. The organization is also known as: Socony-Vacuum Oil Company & Standard Oil Company of New York.

Process for improving thermal stability of synthetic lubes

Abstract: A process is disclosed for improving the thermal stability of polyalpha-olefin lubricants by contacting the lubricant with an acidic catalyst for a time and at a temperature sufficient to achieve the skeletal isomerization of the molecular structure of the lubricant. The reaction is carried out preferably on unhydrogenated synthetic lubricants in contact with Lewis acid catalysts. Following the isomerization reaction, the unsaturated lubricant is hydrogenated to produce lubricant with better thermal stability. Surprisingly, when the isomerization reaction is carried out using unsaturated oligomer produced from the oligomerization of alpha-olefins in contact with reduced Group VIB metal oxide catalyst on porous support as starting material the viscometric properties of the lubricant, e.g., viscosity and VI, are not significantly altered, although the thermal stability of the lubricant is substantially increased. The reaction of the present invention may be carried out in the presence of a solvent or neat. Improvements in thermal stability are observed over a wide range of catalyst concentration. Concentrations of about 10 weight percent are preferred with aluminum chloride catalyst.

Trapping Centers in Thermoluminescent Calcite

Abstract: Trapping levels which account for most of the thermoluminescence in natural calcite have been investigated. Results are based on a study of color centers which are shown to be closely associated with the traps involved in thermoluminescence. Optical absorption measurements in a variety of Iceland-spar crystals show that the prominent calcite glow peaks at 350, 500, 600, and \ensuremath{\sim}700\ifmmode^\circ\else\textdegree\fi{}K are accompanied by thermal bleaching of the color centers. Results indicate that the color centers are due to one kind of trapped-hole center and at least four kinds of trapped-electron centers. Recombinations resulting from thermal bleaching of each of these centers excites emission at ${\mathrm{Mn}}^{++}$ impurity ions and produces the observed glow peaks. The mechanism for exciting the ${\mathrm{Mn}}^{++}$ ions appears to be the same nonradiative transfer process which accounts for sensitized luminescence in calcite.

Atmospheric nitrogen fixation by methane-oxidizing bacteria

Abstract: Davis, J. B. (Socony Mobil Oil Co., Inc., Dallas, Tex.), V. F. Coty, and J. P. Stanley. Atmospheric nitrogen fixation by methane-oxidizing bacteria. J. Bacteriol. 88:468–472. 1964.—Methane-oxidizing bacteria capable of fixing atmospheric nitrogen were isolated from garden soil, pond mud, oil field soil, and soil exposed to natural gas, indicating a rather wide prevalence in nature. This may explain the high concentration of organic nitrogen commonly found in soils exposed to gas leakage from pipelines or natural-gas seeps. Added molybdenum was a requirement for growth in a nitrogen-free mineral salts medium. All nitrogen-fixing, methane-oxidizing bacteria isolated were gram-negative, nonsporeforming, usually motile rods. Colonies were light yellow, yellow, or white. The most common isolate, which formed light-yellow colonies, is referred to as Pseudomonas methanitrificans sp. n., and is distinguished from Pseudomonas (Methanomonas) methanica by nitrogen-fixing ability and a preponderance of poly-β-hydroxybutyrate in the cellular lipid fraction. Images

Method of placing pipe into deviated boreholes

Abstract: A method of pushing pipe (e.g., casing) into a highly deviated borehole. The lower end of the pipe is plugged and the lower portion of the pipe string is filled with fluids (e.g., compressed gases, petroleum products, water, etc.) which have a lower density than that of the borehole fluid. This creates a buoyancy effect for the pipe in the deviated portion of the borehole which aids in keeping the pipe from contacting the lower side of the deviated hole. The pipe can be plugged or capped above the lightened section and filled with heavier fluid to aid in forcing the pipe downward into position. The plugs and caps are then removed, e.g., drilled out, when the pipe is ready for use. The fluids are thereby released into the mud slurry.