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| Number | Title | Issue Date |
| 7641786 | Method of analyzing basestocks for low temperature properties The invention relates to a method for analyzing a lubricating oil for low temperature properties. The method utilizes 2-dimensional gas chromatography (2D GC) to determine the amounts of paraffins and isoparaffins in the oil. In particular, the method analyzes for a... | 01/05/2010 |
| 7341619 | Olefin waxes having improved hardness or viscosity In one embodiment, we disclose hardened olefin waxes and processes for preparing them. In another embodiment, we disclose oxidized olefin waxes having low viscosity and processes for preparing them. The waxes are suitable for use as polishes, coatings, or inks, amon... | 03/11/2008 |
| 7252760 | Waste liquid processing method and waste liquid processing apparatus using the same A waste liquid processing method comprising a solvent separation process for separating a chlorine-based organic solvent contained in a waste liquid; a first vaporization process that includes vaporization of the chlorine-based organic solvent remaining in the waste... | 08/07/2007 |
| 7225730 | Spit assembly support base A support base for supporting the spit assembly of a rotisserie oven. The support base includes a substantially circular-shaped member having a periphery and an indented portion defined therein. The indented portion has a frustum-conical shape and extends downwardly... | 06/05/2007 |
| 7225729 | Countertop rotisserie oven with warming unit Enclosed rotisserie with added convenience, including a countertop resting box-like enclosure housing a safety rear mounted heating element and a power rotated dual rod spit assembly. The gear driven spit assembly may be easily inserted and removed straight into and... | 06/05/2007 |
| 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 the naphthalene is recovered by subsequent filtering out of tar and o... | 02/13/2007 |
| 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 is at least 6° C. above a target pour point, over a select molecular ... | 07/11/2006 |
| 7021203 | Vented countertop rotisserie oven An enclosed rotisserie cooking oven having an enclosure able to rest on a horizontal surface housing a rotisserie spit, and opening to introduce food into the enclosure, a door covering the opening having a first and a second axle rod protruding from the door's peri... | 04/04/2006 |
| 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 hydrocarbon components with optimized branching have low amounts of branchi... | 03/28/2006 |
| 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 solidified waxes, normally present in the petroleum product, are used ... | 05/10/2005 |
| 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 on-line method from a remote control point, in which a slipstream of solven... | 12/07/2004 |
| 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 about 115. The process involves obtaining feedstocks that have a 95% p... | 08/10/2004 |
| 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 is at least 6° C. above a target pour point, over a select... | 12/16/2003 |
| 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.... | 09/16/2003 |
| 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 extraction step to a two step, single stage hydroconversion ... | 07/15/2003 |
| 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 and a catalytic metal, or metals component, preferably co... | 03/11/2003 |
| 6497813 | 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 solidified waxes, normally present in the petroleum product... | 12/24/2002 |
| 6024864 | Method for making a process oil by using aromatic enrichment and two pass hydrofinishing A method for producing a process oil is provided in which an aromatic extract oil is added to a paraffinic rich feed to provide a blended feed. The blended feed is then hydrotreated in a first hydrotreating stage to convert at least a portion of sulfur an... | 02/15/2000 |
| 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 solvent/feedstock mixture, essentially free of a selected co... | 02/15/2000 |
| 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 occurring and/or synthetic ferrierite which ferrierite has been m... | 09/14/1999 |
| 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 the oil producers, refineries and re-refiners comprising ... | 07/13/1999 |
| 5853564 | 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 solvent/feedstock mixture, essentially free of a selected co... | 12/29/1998 |
| 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 60-90 vol. % alcohol). The pre-treated feedstock is then c... | 03/24/1998 |
| 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 filter to remove the wax and obtain an oil/solvent filtrate... | 07/29/1997 |
| 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 solvent tank to thereby increase or decrease a concentrat... | 07/15/1997 |
| 5620588 | 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 solvent/feedstock mixture, essentially free of a selected co... | 04/15/1997 |
| 5611894 | Method and apparatus for changing solvent composition in a solvent recovery system of a dewaxing apparatus An 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 solvent tank to thereby increase or decrease a concentration of MEK... | 03/18/1997 |
| 5547562 | Oil dewaxing method The invention decloses a method for dewaxing a hydrocarbon oil which comprises adding an oil-soluble poly C18 -C22 alkylmethacrylate having a molecular weight of from about 10,000 to about 2,000,000 daltons to a hydrocarbon oil conta... | 08/20/1996 |
| 5494566 | Lubricating oil dewaxing with membrane separation of cold solvent A process for solvent dewaxing petroleum feedstock to separate crystallized wax from lubricant oil by filtration of a wax/oil/solvent mixture. The feedstock is sequentially cooled and mixed with cold polar solvent to form a wax crystal phase and oil-solve... | 02/27/1996 |
| 5474668 | 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 solvent/feedstock mixture, essentially free of a selected co... | 12/12/1995 |
| 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 distillation zone, the resulting first distillate is contacted... | 09/05/1995 |
| 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 having a final boiling point of >600° C. and a mean boil... | 03/28/1995 |
| 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 dewaxing unit, all connected in series. In this process, operatio... | 12/27/1994 |
| 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 concentration of the desired treatment chemical is maintained at a re... | 02/22/1994 |
| 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.... | 08/31/1993 |
| 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 connected to the filter for affecting the operational status... | 05/25/1993 |
| 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 causing precipitation of crystallized waxes. The processes invol... | 03/23/1993 |
| 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 followed by a cold solvent spray below the hot solvent spray.... | 03/02/1993 |
| 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 incorporating into the oil a linear polymer of carbon monoxide w... | 01/19/1993 |
| 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 aromatic components are removed by extraction, e.g. with fur... | 05/05/1992 |
