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| Number | Title | Issue Date |
| 7381309 | Apparatus for prewashing a hydrocarbon stream containing hydrogen sulfide Disclosed is an apparatus for extracting sulfur compounds from a hydrocarbon stream. A prewash section for converting hydrogen sulfide to sodium sulfide by reaction with an alkali such as caustic prepares the hydrocarbon stream for extraction. Spent alkali is contin... | 06/03/2008 |
| 7267760 | Method of removing contaminants from used oil In a method of removing acidic compounds, color, and polynuclear aromatic hydrocarbons, and for removing or converting hydrocarbons containing heteroatoms from used oil distillate, phase transfer catalysts are employed to facilitate the transfer of inorganic or orga... | 09/11/2007 |
| 6929737 | Method of removing contaminants from petroleum distillates In a method of removing acidic compounds, color, and polynuclear aromatic hydrocarbons, and for removing or converting hydrocarbons containing heteroatoms from petroleum distillates, phase transfer catalyst is employed to facilitate the transfer of inorganic or orga... | 08/16/2005 |
| 6905593 | Method for removing calcium from crude oil A calcium-containing hydrocarbonaceous material is treated with an aqueous mixture, comprising acetate ion and an alkaline material and having a pH in the range of 3.0 to 5.0, in order to extract at least a portion of the calcium from the hydrocarbonaceous material ... | 06/14/2005 |
| 6398948 | Method of removing contaminants from used oil In a method of removing acidic compounds, color, and polynuclear aromatic hydrocarbons, and for removing or converting hydrocarbons containing heteroatoms from used oil distillate, phase transfer catalysts are employed to facilitate the transfer of inorga... | 06/04/2002 |
| 6372122 | Method of removing contaminants from petroleum distillates In a method of removing acidic compounds, color, and polynuclear aromatic hydrocarbons, and for removing or converting hydrocarbons containing heteroatoms from petroleum distillates, phase transfer catalyst is employed to facilitate the transfer of inorga... | 04/16/2002 |
| 6338792 | Hydrocarbon sweetening process using a novel liquid collector assembly A novel liquid collector assembly has been developed for a reactor used in the sweetening of sour hydrocarbons (e.g. sour gasoline). This refinery process normally involves contacting a reaction liquid, comprising both aqueous (caustic solution) and organ... | 01/15/2002 |
| 6270678 | Method for treating alkaline waste water The present invention relates to a method of treating alkaline waste water originating from washing spent oil which has undergone an alkaline treatment with water and which contains organic material. This method can produce water which can be discharged i... | 08/07/2001 |
| 6238551 | Method of removing contaminants from petroleum distillates In a method of removing acidic compounds, color, and polynuclear aromatic hydrocarbons, and for removing or converting hydrocarbons containing heteroatoms from petroleum distillates, phase transfer catalyst is employed to facilitate the transfer of inorga... | 05/29/2001 |
| 6179999 | Method of removing contaminants from used oil In a method of removing acidic compounds, color, and polynuclear aromatic hydrocarbons, and for removing or converting hydrocarbons containing heteroatoms from used oil distillate, phase transfer catalysts are employed to facilitate the transfer of inorga... | 01/30/2001 |
| 6174431 | Method for obtaining base oil and removing impurities and additives from used oil products A method for pretreating and re-refining used oil that requires only moderate heat and only one re-refining step. The pretreatment involves mixing the used oil with a basic solution and optionally a phase transfer catalyst. The phase transfer catalyst aid... | 01/16/2001 |
| 6059976 | Reclamation of spent aluminum rolling coolant oils, emulsions and dispersions The present invention is a process for reclaiming and recycling oil/water mixtures. These mixtures are preferably hot or cold rolling oils for aluminum manufacturing operations. When used, the rolling oils contain organometallic particles and have less co... | 05/09/2000 |
| 5573656 | Process for converting acid sludge to asphalt A process for significantly decreasing the acid sludge settling time in waste oil recovery processes comprising the steps of heating used oil to a high temperature above 725 degrees Fahrenheit, cooling the heated oil, adding an oxidizing agent to the oil,... | 11/12/1996 |
| 5470455 | Process for converting acid sludge to intermediate sludge and soft and/or hard asphalt A process for converting the acid sludge produced by waste oil refineries into an intermediate sludge which can be used in the production of either soft, un-oxidized asphalt or hard, oxidized asphalt, and a process for converting the intermediate sludge i... | 11/28/1995 |
| 5288392 | Process for converting acid sludge to intermediate sludge A process for converting the acid sludge produced by waste oil refineries into an acid sludge intermediary which can be used in the production of asphaltic mixtures. The process includes contacting the entire surface area of acid sludge with a pH altering... | 02/22/1994 |
| 5225081 | Method for removing polynuclear aromatics from used lubricating oils Used lubricating oils can be rejuvenated by passing the oil through a filter system comprising a hollow solid composite that contains a thermoplastic binder and an active filter media of a chemically active filter media, a physically active filter media, ... | 07/06/1993 |
| 5209839 | Method of removing hydroperoxides from lubricating oils using sodium hydroxide and a metal thiophosphate NaOH can be used to remove hydroperoxides from a lubricating oil provided the oil contains a metal thiophosphate. This extends the useful life of the oil and the equipment being lubricated. In a preferred embodiment, the NaOH is immobilized within the lub... | 05/11/1993 |
| 5075044 | Process for the radioactive decontamination of an oil According to the invention, the oil is passed through a pulverulent material, such as an earth or clay, in the presence of an acid. The pulverulent material can be placed beforehand on a filter or can be mixed with the oil before filtration. If necessary,... | 12/24/1991 |
| 5069799 | Method for rejuvenating lubricating oils A filter system containing, in series, a first filter media having a chemically active filter media, a physically active filter media, or mixtures thereof and a second filter media having an inactive filter media can effectively rejuvenate used lubricatin... | 12/03/1991 |
| 4997546 | Method of removing hydroperoxides from lubricating oils Hydroperoxides can be removed from a lubricating oil by contacting the oil with a heterogenous hydroperoxide decomposer. This extends the useful life of the oil and the equipment being lubricated. In a preferred embodiment, the hydroperoxide decomposer is... | 03/05/1991 |
| 4925597 | Method for the decontamination of radioactively contaminated liquids In a process for decontaminating radioactively polluted lubricant oil, (a) the lubricant oil to be decontaminated is mechanically filtered, (b) an acid solution of the salts of the elements, the radionuclides of which are to be removed, is added, and (c) ... | 05/15/1990 |
| 4808299 | Removal of copper and iron from oil A process for removing copper and/or iron impurities from a liquid hydrocarbon-containing feed comprises contacting the feed with an aqueous treating agent comprising water-soluble alkali metal silicate (in particular sodium silicate) and/or a surfactant,... | 02/28/1989 |
| 4615794 | Method of removing radioactive waste from oil A method of removing radioactive waste from oil in which all particulates, radioactive contaminants, and moisture are removed from the oil. Particulate matter is removed from the oil by a combination of filtering and heating. Radioactive contaminants are ... | 10/07/1986 |
| 4614597 | Recovery of oil and sulfonate from filter cake A process for recovering oil containing dissolved alkaline earth metal sulfonate from siliceous filter cakes containing such oils by mixing the filter cake with sufficient 0.5 to 16N sulfuric acid or phosphoric acid to bring the pH of the mixture to a lev... | 09/30/1986 |
| 4544491 | Recovery of hydrocarbon oil from filter cakes A process for recovering hydrocarbon oils and hydrocarbon oils containing dissolved additives from filter cakes produced by filtering such oils using a siliceous filter aid. A small amount of a release agent, up to 2 cc per gram of filter cake, is slowly ... | 10/01/1985 |
| 4502948 | Reclaiming used lubricating oil A method for purifying used oil without the use of hydrogen comprising contacting a demetallized used oil with an acid such as sulfuric acid and an adsorbent such as clay.... | 03/05/1985 |
| 4432865 | Process for treating used motor oil and synthetic crude oil A process for treating used motor oil or synthetic crude oil comprising: (i) contacting said used motor oil or synthetic crude oil with an effective amount of (A) a polyfunctional mineral acid and/or the anhydride of said acid and (B) a polyhydroxy compou... | 02/21/1984 |
| 4431524 | Process for treating used industrial oil A process for rerefining used industrial oil comprising the steps of: (i) contacting said oil with an aqueous solution of the basic salt of an alkali metal to precipitate metal contaminants, polar compounds or particulates from said oil and to neutralize ... | 02/14/1984 |
| 4383915 | Clay contacting process for removing contaminants from waste lubricating oil A process is provided for removing contaminants from waste lubricating oil. The previously untreated waste oil is contacted with decolorizing clay and the mixture is heated to and retained for a period of time at a temperature in the range of about 650°-... | 05/17/1983 |
| 4256578 | Waste oil recovery process Oil, used as a lubricant and coolant in an industrial process, may become contaminated by foreign materials, for example, water and solid particulate. Because of its cost, continued use of the oil is desirous but impossible if the foreign materials are no... | 03/17/1981 |
| 4252637 | Process for the reprocessing of used lubricating oils (II) A process for the reprocessing of used lubricating oil wherein said oils are treated with a mixture of potassium hydroxide and sodium hydroxide.... | 02/24/1981 |
| 4144162 | Method for the containment of oils and oil sludges A method for the solidification and containment of sludge from an oil reclaiming process to permit environmentally safe storage disposal of the sludge and particularly electric transformer oil containing PCB's. In the process, the sludge or oil is mixed w... | 03/13/1979 |
| 4097369 | Process for reclaiming used hydrocarbon oils A process for reclaiming used hydrocarbon oils through prepurification by means of coagulation, adsorption, filtration, distillation, and after-treatment, wherein said oils are prepurified and then dehalogenated, fractionally distilled and hydrogenated. I... | 06/27/1978 |
| 3954602 | Process for cleaning used oils A process for cleaning a used oil, in particular engine oil and industrial lubricating oil. The process comprises heat treating the used oil in a heat treatment zone at a temperature of 325°-400°C at a pressure of 1-6 bars for a period of at least 15 mi... | 05/04/1976 |
