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| Number | Title | Issue Date |
| 8133459 | Method for purifying aqueous alkaline solution A method for purifying an aqueous alkaline solution, which comprises: bringing a fibrous activated carbon into contact with an aqueous alkaline solution to remove a metal component other than alkali metals and alkaline earth metals from the aqueous alkaline solution... | 03/13/2012 |
| 7833499 | Separation process A separation process for separating two or more immiscible liquids using fiber-film technology is disclosed. This separation process is especially useful in the separation of disulfide oil formed during the oxidation of spent caustic solution that was used to remove... | 11/16/2010 |
| 7578984 | Regeneration of caustic solutions A caustic recovery system comprising an oxygen source adapted to provide a gas stream comprising at least 30% oxygen. A method of regenerating caustic comprising intermingling spent caustic with a gas stream comprising at least 30% oxygen. ... | 08/25/2009 |
| 7270726 | Method for the production of green liquor The method is for production of green liquor in association with a causticizing process during recovery of chemicals in manufacture of sulphate pulp. A smelt (14) of chemicals principally consisting of Na2S and Na2CO3 from a soda boiler ... | 09/18/2007 |
| 7247284 | Method and apparatus for regeneration of flue gas scrubber caustic solutions A process to regenerate wet flue gas scrubber purge liquid into NaOH caustic suitable for make-up caustic for the scrubber is disclosed. Further, sulfur is removed from waste effluent in the form of gypsum with the process described herein. Lime is added to the spen... | 07/24/2007 |
| 7214290 | Treatment of spent caustic refinery effluents In the methods for treatment of caustic effluents described in the specification, a spent caustic refinery effluent is supplied to a submerged combustion gas evaporator in which hot combustion gas containing carbon dioxide is injected into the caustic liquid to conc... | 05/08/2007 |
| 7179437 | Feeding device and process and feeding system which utilize the feeding device Feeding device for feeding burned lime to a reaction vessel for causticizing a soda liquor to caustic soda. The feeding device, in its upper part, comprises an inlet for a slurry of the burned lime and the soda liquor for formation of said slurry inside said feeding... | 02/20/2007 |
| 7029573 | Composition and control method for treating hydrocarbon The invention relates to a composition and method for treating liquid hydrocarbons in order to remove acidic impurities, such as mercaptans, particularly mercaptans having a molecular weight of about C4 (C4H10S=90 g/mole) and higher,... | 04/18/2006 |
| 6960291 | Naphtha desulfurization method The invention relates to a method for desulfurizing naphtha boiling-range hydrocarbons such as cracked naphtha. More particularly, the invention relates to hydrotreating the naphtha under selective hydrotreating conditions, and then removing mercaptans from the hydr... | 11/01/2005 |
| 6955695 | Conversion of petroleum residua to methane This invention discloses improvements on previous inventions for catalytic conversion of coal and steam to methane. The disclosed improvements permit conversion of petroleum residua or heavy crude petroleum to methane and carbon dioxide such that nearly all of the h... | 10/18/2005 |
| 6387348 | Method for treating spent caustic streams Sulfur compounds present as sulfides and mercaptans in spent caustic streams from refinery and petrochemical processes are oxidized by contacting them with an oxygen-containing gas in a packed column recycle reactor.... | 05/14/2002 |
| 6210583 | Spent caustic pretreatment and enhanced oxidation process A process for pre-treating a spent caustic stream prior to oxidation which includes countercurrent multi-stage elevated temperature solvent extraction of dissolved organic material from the spent caustic using a solvent to yield a spent caustic raffinate ... | 04/03/2001 |
| 5997731 | Process for treating an effluent alkaline stream having sulfur-containing and phenolic compounds An alkaline solution containing dissolved sodium sulfides, mercaptides and phenolates is treated with a carbon dioxide-containing solvent in a reaction zone under mass transfer conditions to neutralize effluent alkaline solution and recover processable hy... | 12/07/1999 |
| 5885422 | Spent caustic (pre)treatment process A process for pretreating a spent caustic stream prior to oxidation includes countercurrent multi-stage elevated temperature solvent extraction of dissolved organic material from the spent caustic using a solvent to yield a spent caustic raffinate contain... | 03/23/1999 |
| 5667633 | Method of producing white liquor streams of high and low sulphidity A method of producing white liquor having enhanced and/or reduced sulphidity in the recovery of chemicals in a sulphate pulp process is described. In the method one starts from a calcium sulphide rich smelt of inorganic chemicals, which has been obtained ... | 09/16/1997 |
| 5597664 | Lithium manganese oxide compound and method of preparation A method for manufacturing Li2 Mn2 O4 which comprises the steps of providing LiMn2 O4 ; providing a lithium salt; forming a solution or suspension of the LiMn2 O4 and lithium salt in ... | 01/28/1997 |
| 5545385 | Process for recovering alkali metal hydroxide from organic liquors The specification describes a process for recovering alkali metal hydroxides from an organic liquor such as black liquors derived from pulping wood chips. The organic liquor is burned in a fluidised bed combustion furnace containing fluidised particles of... | 08/13/1996 |
| 5520902 | Process for making chromium-free orthorhombic sodium sulfate Disclosed is a process for making orthorhombic Na2 SO4 containing less than 0.1 ppm chromium from a solution of Na2 SO4 containing 0.1 to 100 ppm Cr(III). The Cr(III) is oxidized to Cr(VI) at a pH greater than 7... | 05/28/1996 |
| 5508018 | Process for the regeneration of sodium hydroxide from sodium sulfide The present invention is directed toward a process for regenerating sodium hydroxide (NaOH) from aqueous solutions of sodium sulfide (Na2 S) comprising heating aqueous sodium sulfide in the presence of a metal selected from the group consisting... | 04/16/1996 |
| 5238664 | Soda ash production Process for disposing of insoluble tailings that remain when solubilizing uncalcined or calcined trona in the process of producing soda ash, in which the tailings are slurried with water or waste solutions of sodium carbonate and/or sodium bicarbonate, ad... | 08/24/1993 |
| 5209828 | System for concentrating a spent caustic stream A system and method of concentrating spent caustic at a refinery has a multi-stage flash drum for separating a spent caustic stream into an overhead output stream including vaporized water and volatile organic compounds, and a concentrated spent caustic o... | 05/11/1993 |
| 5178848 | Lithium metatungstate Lithium metatungstate as a new composition of matter and the production thereof are disclosed. A solution of lithium monotungstate is treated with an extractant to remove sufficient lithium ions to produce a dilute solution of lithium metatungstate and th... | 01/12/1993 |
| 5135732 | Method for preparation of LiMn2 O4 intercalation compounds and use thereof in secondary lithium batteries Method is described for the low temperature preparation of the spinel LiMn2 O4 phase which is an intercalable compound of interest for use in lithium secondary batteries. This phase can be prepared in bulk or thick film form at tempe... | 08/04/1992 |
| 5068095 | Method for reducing the amount of colorants in a caustic liquor A method for treating caustic solutions to remove colorants, including iron, therefrom comprises: contacting the solution with a substance comprising a calcined product of a compound having the formula: Aw Bx (OH)y Cz... | 11/26/1991 |
| 5047119 | Method of stabilizing white liquor flow in the causticizing of green liquor from a kraft paper plant An improved method for causticizing the green liquor formed in a kraft paper plant by contacting the green liquor with lime to thereby form white liquor followed by clarifying the white liquor by removing the lime mud therefrom in a clarifier is disclosed... | 09/10/1991 |
| 4941945 | Method for clarifying green liquor A method of cleaning green liquor of solid particulate impurities by adding caustic lime corresponding to 0.5 to 10% of the amount of caustic lime needed for complete causticizing of the green liquor to the green liquor in a soda dissolving tank or in a s... | 07/17/1990 |
| 4894217 | Process for causticizing of an aqueous solution containing alkali carbonate Process for causticizing a water solution containing alkali carbonate with calcium oxide and hydroxide by bringing the water solution containing alkali carbonate into contact with the calcium oxide or hydroxide and by separating the alkali hydroxide solut... | 01/16/1990 |
| 4889592 | Process and apparatus for control in burning and slaking of lime and causticizing Method and apparatus for controlling the reactivity of lime produced in a lime cycle process that includes the steps of forming burnt lime in a kiln, washing and filtering of lime sludge, and causticizing of green liquor, which lime cycle process steps ar... | 12/26/1989 |
| 4875997 | Process for treating hydrocarbons containing mercaptans A process for treating hydrocarbons containing mercaptans comprising the steps of contacting a first mercaptan-containing hydrocarbon stream with a first aqueous alkaline solution stream to form a mercaptide-rich aqueous alkaline solution stream and a red... | 10/24/1989 |
| 4844838 | Method of treatment of radioactive liquid waste A method of treatment of a radioactive liquid waste containing fission products and a thermally decomposable sodium compound which comprises heating the liquid waste to convert the sodium compound into oxides of sodium, converting the oxides into sodium, ... | 07/04/1989 |
| 4837002 | Removal of chlorate from caustic soda Chlorate is removed from aqueous caustic soda by reducing with iron pentacarbonyl and separating off the resulting iron oxide containing precipitate.... | 06/06/1989 |
| 4804498 | Process for treating radioactive waste liquid A soluble salt (sodium sulfate or sodium borate (Na2 SO4 or Na2 B4 O7) contained as the main component in a concentrated radioactive waste liquid generated in the BWR power plant or the PWR power plan... | 02/14/1989 |
| 4800042 | Radioactive waste water treatment A volume-reducing solidification treatment method for radioactive waste liquid containing boron primarily in the form of boric acid or borates is disclosed. After an alkali is added to the waste water to adjust pH thereof, and optionally after evaporation... | 01/24/1989 |
| 4770742 | Method for increasing the efficiency of a causticizing process A method for increasing the efficiency of the caustizing process which comprises: (a) adding to a green liquor between 78 and 82% of the stoichiometric amount of lime necessary to react with the amount of Na2 CO3 present in the green... | 09/13/1988 |
| 4762590 | Causticizing process The invention concerns a causticizing procedure by which from soda liquor derived from a sulphate cellulose digesting process and from unslaked lime is produced white liquor for reuse in the digesting process, over lime slaking and a subsequent causticizi... | 08/09/1988 |
| 4676971 | Method for removing chlorate from alkali metal hydroxide A method is disclosed for reducing alkali metal chlorate impurities in an aqueous alkali metal hydroxide solution by heating a mixture of the alkali metal hydroxide solution with a hydroxycarboxylic acid or a salt thereof at temperature above about 125° ... | 06/30/1987 |
| 4668342 | Recausticizing kraft green liquor A process of recausticizing kraft green liquor in which the green liquor containing sodium carbonate is passed in a stream in admixture with particles comprising slaked lime, in which stream the liquid phase becomes progressively weaker in sodium carbonat... | 05/26/1987 |
| 4666689 | Process for regenerating an alkaline stream containing mercaptan compounds An alkaline solution containing mercaptides is regenerated in an improved process wherein the alkaline solution to be regenerated containing a suitable oxidation catalyst is contacted with an oxygen-containing solvent which is immiscible with said alkalin... | 05/19/1987 |
| 4636376 | Sulfate removal from alkali metal chlorate solutions A process for the removal of essentially chromium-free sulfate from a chromate and sulfate-containing chlorate liquor which includes mixing the chlorate liquor having a pH of between about 2.0 and 6.0 with a calcium-containing material at a temperature an... | 01/13/1987 |
| 4618480 | Recovery of alumina values from alunite ore A novel process for the recovery of alumina and potassium sulfate from alunite is provided comprising leaching the alunite with potassium hydroxide to which no sodium materials have been added, said leach solution being saturated with potassium sulfate. A... | 10/21/1986 |
