Abstract:
A method for generating, recording and pre-processing high fidelity vibratory seismic data in a system that uses a plurality of vibratory sources (18, 20, 22 and 24) includes the steps of measuring the motion of each of the vibrators (18, 20, 22 and 24), determining a ratio by dividing the vibratory seismic data by the measured motion of the vibrator to remove the unknown applied force leaving the earth reflectivity times a time derivative divided by a minimum phase function, minimum phase band pass filtering (54) the resulting ratio and performing minimum phase deconvolution (56) to remove the time derivative divided by the transfer function of minimum phase. The method may also include the steps of shot ensemble deconvolution (66), receiver ensemble deconvolution (72), statics correction (88), F-K filtering (70) for noise, zero phase spiking deconvolution (74) and model dephasing (76). The vibrator motion is measured to provide a signal that is used to process the data. The data is divided by the relative of the actual transmitted signal in frequency domain.
Abstract:
A method for receiving and pre-processing vertical seismic profile high fidelity vibratory seismic data includes the steps of measuring the motion of the vibrator which is related to the vibrator applied force times a transfer function of minimum phase, causal, linear system relating the actual vibrator output with the measured vibrator motion (50), separating signals according to the generating source of each (52), determining a ratio by dividing the vibratory seismic data be the measured motion of the vibrator to remove the unknown applied force leaving the earth reflectivity times a time derivative divided by a minimum phase function (54), minimum phase band pass filtering the resulting ratio (56) and performing minimum phase deconvolution (58) to remove the time derivative divided by the transfer function of minimum phase.
Abstract:
An ethylene-alpha-olefin copolymerization catalyst is prepared by impregnating a porous support, such as silica, with a contact mixture of an organomagnesium compound such as dialkyl magnesium and a silane compound which is free of hydroxyl groups, such as tetraethyl orthosilicate. A transition metal component such as titanium tetrachloride is then incorporated into the support in a specific ratio to the magnesium and silane components. Activation of this catalyst precursor with a trialkylaluminum compound results in a catalyst system which is effective for the production of ethylene copolymers.
Abstract:
Single reactor bimodal MWD high molecular weight polyethylene film resin has improved bubble stability. The bimodal molecular weight distribution resin has low resin elasticity. Preferably the resin is made catalytically in one reactor. The preferred catalyst appears to control the properties of bubble stability and elasticity.
Abstract:
A metallizable multilayer film structure of enhanced bond strength comprises a) a flame or corona discharge treated upper skin layer (a) consisting essentially of ethylene-propylene-butylene terpolymer and low density polyethylene; b) a base layer comprising high density polyethylene, and c) a lower skin layer (c) comprising ethylene-propylene-butylene terpolymer and an antiblock component selected from the group consisting of silicone oil and silicone particulate.
Abstract:
A process for converting at least one olefin and at least one paraffin to a diesel fuel blending component comprises the steps of contacting said olefin and said isoparaffin with a catalyst selected from the group consisting of MCM-22, MCM-36, MCM-49, MCM-56 and MCM-58 to provide a product containing a diesel fuel.
Abstract:
A process for the net catalytic oxidative dehydrogenation of alkanes to produce alkenes is provided. The process involves simultaneous equilibrium dehydrogenation of alkanes to alkenes and combustion of the hydrogen formed to drive the equilibrium dehydrogenation reaction further to the product alkenes. In the present reaction, the alkane feed is dehydrogenated over an equilibrium dehydrogenation catalyst in a first reactor (110) and the effluent, along with oxygen is then passed into the second reactor (120) containing a metal oxide catalyst which serves to selectively catalyze the combustion of hydrogen. The equilibrium dehydrogenation catalyst may comprise platinum and the selective metal oxide combustion catalyst may contain bismuth, antimony, indium, or molybdenum, or a mixture thereof.
Abstract:
Lubricant and fuel compositions contain a combination of an organo, ring-substituted diphenyl sulfide, e.g. a monoalkyldiphenyl sulfide; a succinic dispersant component which is a polymer-substituted succinimide, succinamide and/or succinic acid ester; a dithiophosphate, e.g., a zinc dithiophosphate. The compositions have superior antiwear and extreme pressure properties.
Abstract:
This invention discloses a process for producing a high Viscosity Index lubricant having a VI of at least 125 from a waxy hydrocarbon feed having a wax content of at least 40 wt.%. The process comprises catalytically dewaxing waxy paraffins present in the feed by isomerization in the presence of hydrogen and in the presence of a low acidity large pore zeolite isomerization catalyst. This catalyst has a ratio of SiO2/Al2O3, as synthesized, of at least 200:1, wherein the catalyst is prepared in the absence of boron. The feed may be hydrocracked prior to dewaxing with the large pore zeolite. The effluent of the process may also be further dewaxed by either solvent or catalytic means in order to achieve target pour point.
Abstract translation:本发明公开了一种由具有至少40重量%的蜡含量的蜡质烃原料生产VI至少为125的高粘度指数润滑剂的方法。 该方法包括通过异构化在氢气存在下和在低酸性大孔沸石异构化催化剂的存在下将存在于进料中的蜡状链烷烃催化脱蜡。 该催化剂具有至少200:1的合成的SiO 2 / Al 2 O 3的比例,其中催化剂在不存在硼的情况下制备。 在用大孔沸石脱蜡之前,可以将进料加氢裂化。 该方法的流出物还可以通过溶剂或催化装置进一步脱蜡,以达到目标倾点。
Abstract:
A heavy aromatics feed is converted to lighter aromatics products, such as benzene, toluene and xylenes by contacting a C9+ aromatics fraction and benzene and/or toluene over a catalyst comprising a zeolite, such as ZSM-12, and hydrogenation component, preferably platinum. The catalyst, complete with hydrogenation component, is treated to reduce aromatics loss. Treatment includes exposure to steam and/or sulfur after incorporation of the hydrogenation component. For additional stability and aromatics retention the steamed and/or sulfur treated catalyst is sulfided by cofeeding a source of sulfur. A low hydrogen partial pressure is preferably employed to assist in aromatics retention.