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7513989 |
Hydrocracking process using bulk group VIII/Group VIB catalysts
The invention relates to a hydrocracking process for hydrocracking petroleum and chemical feedstocks using bulk Group VIII/VIB catalysts. Preferred catalysts include those comprised of Ni—Mo—W.
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7176341 |
Method and devices for producing naphthalene from coke produced from coke oven crude gas
A method and apparatus are disclosed for recovering pure naphthalene from hot crude coke oven gas. The hot crude coke oven gas is directly cooled by means of sprinkling water directly thereon, and...
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7074320 |
Preparing a high viscosity index, low branch index dewaxed oil
An integrated process for preparing a lubricating oil base stock includes an isomerization step followed by a solvent dewaxing step. A waxy feed is isomerized to an intermediate pore point, which...
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7018525 |
Processes for producing lubricant base oils with optimized branching
This invention relates to processes of producing lubricant base oils comprising paraffinic hydrocarbon components that have optimized branching. The lubricant base oils comprising paraffinic...
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6890425 |
Solvent extraction refining of petroleum products
A method of refining a petroleum product to remove aromatics and to separate paraffinic oils and waxes is provided. The method involves the utilization of phase equilibria wherein crystallized or...
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6827842 |
On-line determination of wax crystallization temperature of waxy solvent stream
A laser beam reflected by wax crystals is used in determining the wax crystallization temperature of a hot dewaxing solvent upstream of solvent chillers. This is automatically achieved by an...
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6773578 |
Process for preparing lubes with high viscosity index values
Lube base stocks and lube stock compositions, as well as a process for preparing lube base stocks and lube stock compositions, are disclosed. The lube oils preferably have a viscosity index above...
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6663768 |
Preparing a HGH viscosity index, low branch index dewaxed
An integrated process for preparing a lubricating oil base stock includes an isomerization step followed by a solvent dewaxing step. A waxy feed is isomerized to an intermediate pore point, which...
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6620313 |
Hydroconversion process using bulk group VIII/Group VIB catalysts
Hydroconversion process of petroleum and chemical feedstocks using bulk Group VIII/Group VIB catalysts. Preferred catalysts include those comprised of Ni—Mo—W.
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6592748 |
Reffinate hydroconversion process
A process for producing a high VI/low volatility lubricating oil basestock and a lubricating oil basestock prepared by said process. The process comprises subjecting the raffinate from a solvent...
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6531517 |
Process for increasing carbon monoxide hydrogenation activity of catalysts via low temperature oxidation with water, steam or mixture thereof
A process for increasing the hydrogenation activity, particularly the carbon monoxide hydrogenation activity, of a catalyst or catalyst precursor comprised of a particulate solids support component...
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6024862 |
Petroleum-wax separation
A process for dewaxing including the steps of mixing a waxy feedstock near its pour point with an ambient or below ambient temperature solvent essentially free of a selected cosolvent, to form a...
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5951847 |
Catalytic dehazing of lubricating base oils
A process for catalytically dehazing lubricating base oils is disclosed, which comprises contacting the lubricating base oil in the presence of hydrogen with a catalyst comprising naturally...
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5922189 |
Process to refine petroleum residues and sludges into asphalt and/or other petroleum products
A process for significantly decreasing processing time, reducing capital costs, increasing yield, improving quality, and improving the safety of refining petroleum residues and sludges generated by...
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5730858 |
Process for converting wax-containing hydrocarbon feedstocks into high-grade middle distillate products
The wax-containing hydrocarbon feedstocks are pre-treated by contacting them with a homogeneous solution containing 1-5 vol. % of an acid diluted in an alcohol/water mixture (preferably containing...
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5651877 |
Lubricating oil dewaxing with membrane separation
A semicontinuous process for solvent dewaxing a waxy petroleum oil feed stream including the steps of: diluting of the waxy oil feed stream with solvent; feeding cold oil/solvent/wax mixture to a...
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5647971 |
Method and apparatus for changing solvent composition in a solvent recovery system of a dewaxing apparatus
A method and apparatus for changing the solvent composition in a solvent recovery system of a dewaxing apparatus, depending on the type of stock oil, by introducing a part of dry solvent into a wet...
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5547562 |
Oil dewaxing method
The invention decloses a method for dewaxing a hydrocarbon oil which comprises adding an oil-soluble poly C 18 -C 22 alkylmethacrylate having a molecular weight of from about 10,000 to about...
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5447620 |
Method of dehydrating the solvent resulting from a process step of dewaxing hydrocarbons
A method of dehydrating a solvent originating from a hydrocarbon dewaxing operation, wherein a moist composite organic solvent, for example a moist MEK/toluene mixture is dehydrated in a first...
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5401383 |
Controlling chilling tower profile for dilution chilling dewaxing of 600N waxy oil
The incremental solvent dilution chilling of 600N waxy oils in a staged agitated chilling tower using cold solvent injection is improved in terms of feed filter rate with respect to a 600N waxy oil...
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5376257 |
Process for feed oil refining for production of lubricating oil
A process for feed oil refining for production of lubricating oil, by using an equipment for lubricating oil production including a fulfural refining unit, a hydrotreating unit and a ketone...
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5288713 |
Method for injecting treatment chemicals
A method for providing a continuous injection of a substantially constant amount of a desired treatment chemical into a flowing process stream is described. This method insures that the...
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5240591 |
Membrane process for separating a mixture containing dewaxed oil and dewaxing solvent
A charge containing dewaxed oil/dewaxing solvent may be treated to effect separation of components by a thermally cross-linked hydrocarbon-derived elastomer membrane, typified by polybutadiene.
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5213696 |
Automatic dewaxing filter washing system and method
The present invention is an automatic filter cleaning system which includes a solvent dewaxing filter which removes wax from a wax mix slurry and provides a filtrate. Status control apparatus is...
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5196116 |
Process for petroleum - wax separation at or above room temperature
There are disclosed processes for separating waxes of different melting points from a room temperature amorphous or liquid hydrocarbon mixture in an energy conservative manner by selectively...
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5190673 |
Filtration in solvent dewaxing with continuous spraying of filter with both hot and cold solvents
An improved solvent dewaxing process in which a method and apparatus for continuous hot wash of a dewaxing filter is disclosed. A hot wash solvent is continuously sprayed below the doctor blade...
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5180483 |
Dewaxing process
This invention relates to a process of dewaxing a hydrocarbon oil involving the steps of separating and precipitating the wax component of the hydrocarbon oil. This process is facilitated by...
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5110445 |
Lubricant production process
Hydrocarbon lubricants having a high viscosity index (V.I.) and low pour point are produced by hydroisomerizing a waxy lube feed such as slack wax or a waxy gas oil over zeolite beta after which...
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5098550 |
Method for dewaxing waxy petroleum products
A method for the solvent dewaxing of wax-containing petroleum products with at least one solvent suitable for dewaxing and a polymeric dewaxing aid comprising polyacrylates, by mixing the products...
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5084183 |
Fractionation of light/heavy waxes by use of porous membranes
Mixtures of light and heavy waxes are fractionated by permeation through a porous membrane at temperatures just above the cloud point of the mixture with the heavier, higher melting point waxes...
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5059299 |
Method for isomerizing wax to lube base oils
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...
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5006222 |
Solvent dewaxing of lubricating oils
An improvement has been discovered in a process for solvent dewaxing a hydrocarbon lubricating oil stock. Solvent dewaxed oils are steam stripped and then vacuum dehydrated at 2.5 psia at the steam...
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4985138 |
Process for treating a charge containing dewaxing solvent and dewaxed oil
Dewaxed oil containing dewaxing solvent from solvent dewaxing is treated by contact with a separating membrane to yield a retentate containing increased content of dewaxed oil and decreased content...
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4956492 |
Dialkyl fumarate - vinyl acetate copolymers useful as dewaxing aids
Copolymers of dialkyl fumarate and vinyl acetate having Specific Viscosities of at least 2.5 at 2% polymer concentration in xylene at 40° C., and wherein at least 50 wt. % of said alkyl groups are...
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4952303 |
Process for preparing a very high quality lube base stock oil
A process for obtaining a very high quality lube base stock is disclosed which comprises: (a) introducing an aromatic and nitrogen-and sulfur-containing feedstock selected from the group...
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4950382 |
Process for improving the low temperature performance of dewaxed oil and formulated oil products
Dewaxed oils can have their low temperature performance improved by the removal of residual wax by adsorption of said residual wax onto a hydrophobic molecular sieve. The wax-laden hydrophobic...
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4911821 |
Lubricant production process employing sequential dewaxing and solvent extraction
Lubricants of improved characteristics are produced by carrying out a solvent extraction to remove aromatic components after solvent or catalytic dewaxing. Aromatic extraction solvents such as...
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4904367 |
Removing haze from dewaxed hydrocarbon oil mixture boiling in the lubricating oil range
In a lube oil dewaxing plant in which waxy lube oil is firstly conditioned to promote wax crystallization, such as by adding an oil solvent and chilling the resulting admixture, and then filtered...
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4898659 |
Multi-point cold solvent injection in scraped surface dewaxing chillers
Solvent dewaxing of waxy hydrocarbon oils using scraped surface chillers is improved by injecting cold solvent into the scraped surface chillers at multiple points to augment the indirect chilling...
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4885062 |
Lube oil solvent dewaxing control system
A control system controls a lubricating oil dewaxing apparatus. The temperature of waxy oil flowing through the apparatus is controlled. A sequential plurality of temperature sensing means senses...
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4867862 |
Process for hydrodehazing hydrocracked lube oil base stocks
I disclose a single stage, multilayered catalyst system capable of hydrodehazing and hydrofinishing a solvent dewaxed lube oil base stock. In the first layer, I catalytically dewax the solvent...
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4820400 |
Process for removing haze from dewaxed hydrocarbon oil mixture boiling in the lubricating oil range (OP-3379)
For removing haze from dewaxed hydrocarbon oil mixture boiling in the lubricating oil range which is hazy, the hazy oil mixture is filtered in the filtration stage (201) of a dewaxing plant which...
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4760212 |
Electrical insulating oils
This invention relates to an electrical insulating oil consisting essentially of a oil having a boiling point of not less than 150° C., a viscosity of 2 to 500 centistokes (at 40° C.), a pour...
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4728414 |
Solvent dewaxing using combination poly (n-C.sub.24) alkylmethacrylate-poly (C.sub.8 -C.sub.20 alkyl (meth-) acrylate dewaxing aid
Solvent dewaxing of waxy hydrocarbon oils is improved by using a poly (n-C 24 ) alkyl methacrylate polymer dewaxing aid in combination with lower melting point weight poly (C 8 -C 20 ) alkyl...
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4728413 |
Agitated dewaxing employing modified agitator means
The filtration performance of a slurry containing crystallized wax, dewaxed oil and dewaxing solvent is improved by use of an agitator means which possesses a characteristic dimension which when...
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4695363 |
Wax crystal modification using dewaxing aids under agitated conditions
Wax crystals of improved morphology are produced by employing a dewaxing aid in an agitated solvent dewaxing environment, preferably an agitated indirect chilling solvent dewaxing environment, such...
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4678556 |
Method of producing lube stocks from waxy crudes
Multi-step synergistic process for converting waxy-containing hydrocarbon feedstocks to lube oil stocks having targeted pour points is disclosed. The waxy feed is first catalytically partially...
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4678555 |
Preparation of cellulose acetate membrane and its use for polar solvent-oil separation
It has been discovered that cellulose acetate membranes, fabricated using nonaqueous solvent systems, can be used for the separation of polar solvents, especially ketone dewaxing solvents from...
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4622130 |
Economic combinative solvent and catalytic dewaxing process employing methylisopropyl ketone as the solvent and a silicate-based catalyst
This invention discloses an economic series flow dewaxing scheme having a first solvent dewaxing step followed by a catalytic dewaxing step. The use of methylisopropyl ketone as a key component in...
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4608151 |
Process for producing high quality, high molecular weight microcrystalline wax derived from undewaxed bright stock
A process for producing high quality, high molecular weight microcrystalline wax from a hydrocracked, undewaxed bright stock, comprising hydrodenitrification, mild hydrofinishing, and solvent...
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