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| Number | Title | Issue Date |
| 7632479 | Process for producing ammonia and sulfuric acid from a stream comprising ammonium sulfate A process for producing ammonia and sulfuric acid from a stream comprising ammonium sulfate is provided. The process comprises the steps of heating the stream to produce ammonia and a decomposition product comprising one or more than one of a bisulfate salt, a pyros... | 12/15/2009 |
| 7431902 | Separation of ammonia from sulfur compounds A method for separating ammonia and sulfides from a sour water stream is disclosed. The stripping of a sour water stream where it is stripped to create a sour water stripper overhead gas and then contacted with an alkali hydroxide in order to separate ammonia and ma... | 10/07/2008 |
| 7416715 | Method and apparatus for the production of gaseous ammonia from a urea solution A safe, economical and predictable process for producing ammonia from a urea solution, preferably where only a small amount of ammonia is required, (i.e. for SCR denitrification for small boilers, flue gas conditioning to enhance precipitator efficiency and/or allev... | 08/26/2008 |
| 7351339 | Method for the separation of acids from chemical reaction mixtures by means of ionic fluids A process for removing acids from reaction mixtures using an auxiliary base, in which the auxiliary base: combines with the acid to form a salt which is liquid at temperatures at which the product of value does not significantly decompose during the removal of the l... | 04/01/2008 |
| 7270796 | Ammonium/ammonia removal from a stream In one embodiment, an ammonium removal method can comprise: removing a multivalent cation from a stream comprising ammonium to form a treated stream; converting the ammonium in the stream to ammonia by increasing the pH of the stream; and separating the ammonia from... | 09/18/2007 |
| 7241373 | Nitrogen treating method There is provided a nitrogen treating method capable of treating nitrogen compounds efficiently. The method is a nitrogen treating method of treating nitrogen compounds in for-treatment water by electrolysis and performs a first treating step of producing ammonia fr... | 07/10/2007 |
| 7229601 | Ammonia reclamation system A process for reclaiming ammonia from waste streams comprises reacting at least one waste stream with an excess of hydroxide to produce ammonia and water. The ammonia is removed from the reaction vessel and purified. ... | 06/12/2007 |
| 7052660 | Wet-processing method for combustion ashes of petroleum fuels There is disclosed a wet-processing method for combustion ashes of petroleum fuels, comprising a slurry preparation step of preparing a slurry of the combustion ashes; a metal oxidation step of preparing a slurry containing ammonium metavanadate; a solid/liquid sepa... | 05/30/2006 |
| 7033562 | Ammonia recovery in the preparation of silazanes and polysilazanes Silazanes and/or polysilazanes are prepared by ammonolysis reaction in liquid anhydrous ammonia by introducing at least one halosilane into the ammonia. In addition to the silazane and/or polysilazane, an ammonolysis by-product also results. A substantially more eff... | 04/25/2006 |
| 6861041 | Method for treating and upgrading effluents containing metallic sulphates using an ammonia addition step A method for treating and upgrading effluents containing at least a metallic sulphate comprising adding at least a base to the effluent to precipitate the metallic ions in the form of iron oxy-hydroxides Fe(OHx) wherein x=2 and/or 3; separating the precip... | 03/01/2005 |
| 6752975 | Combustion exhaust gas treatment process and treatment apparatus Denitrated combustion exhaust gas is desulfurized with ammonia, the waste water obtained from washing the desulfurization waste water or dust ash is filtered using calcium carbonate, the pH of the filtrate is adjusted, carbon dioxide and/or aqueous carbonic acid is ... | 06/22/2004 |
| 6746654 | Dry and semi-dry methods for removal of ammonia from fly ash A method for removing ammonia from fly ash employs water mist (a water fog) or a flowing warm humid air stream to rid the fly ash of ammonia. Ozone alone or with other co-oxidants such as hydrogen peroxide are also used to rid fly ash of ammonia. ... | 06/08/2004 |
| 6558643 | Method for ammonia removal from waste streams Methods for direct reduction of ammonia from waste streams by the steps of reacting an aqueous ammonia containing waste stream with a solution of a strong acid and a metal salt, wherein the cation in said metal salt of said solution is selected from the g... | 05/06/2003 |
| 6485700 | Process for producing free hydroxylamine aqueous solution This invention provides a process for producing a free hydroxylamine aqueous solution, by letting an alkali react with separated sulfates, for conversion into ammonia and sulfates not containing any nitrogen atom, recovering the valuable ammonia and recyc... | 11/26/2002 |
| 6333012 | Process for producing ammonium metavanadate A process is provided for preparing ammonium metavanadate from the combustion ashes resulting from the combustion of petroleum fuels in a boiler by using the ammonium sulfate and vanadium components in the combustion ash. Water is added to the combustion ... | 12/25/2001 |
| 6077494 | Method for removing ammonia from ammonia contaminated fly ash A method for removing ammonia from coal fly ash contaminated by ammonium salts is disclosed. The method involves the addition of small amounts of water, and in some cases, small amounts of an alkali source, to the fly ash to liberate the ammonia trapped t... | 06/20/2000 |
| 6060030 | Detached plume abatement method A method is provided for abating acidic contaminants, such as sulfur dioxide and hydrogen chloride, in exhaust gases while minimizing the formation of visible plumes of ammonium salts proximate to the outlet of the exhaust stack by injecting a spray of an... | 05/09/2000 |
| 6033637 | Method for treating combustion ashes A method is provided for treating ashes from the combustion of petroleum fuels by mixing the combustion ashes with water to produce a slurry; injecting either calcium oxide or calcium hydroxide into the slurry and reacting the calcium oxide or calcium hyd... | 03/07/2000 |
| 5763652 | Process for producing a carboxylic acid A nitrile compound or an amide compound is hydrolyzed in the presence of an inorganic acid or other acidic catalyst or an alkali metal hydroxide or other basic catalyst, and the by-produced ammonium salt of the acidic catalyst or the produced salt of a ca... | 06/09/1998 |
| 5387407 | Process for the recovery of ammonia from flue gases For reducing nitrogen oxides in the flue gases of a firing plant, fresh ammonia water, i.e. an aqueous solution of ammonia (NH3), is introduced into the flue gas flow. For achieving a high degree of separation of the nitrogen oxide a superstoic... | 02/07/1995 |
| 5281318 | Process for processing a waste etching solution containing a fluorine component and an ammonia component to recover valuables therefrom A process for recovering valuables from a waste etching solution containing a fluorine component and ammonia component is provided comprising recovering respectively a fluorine component and ammonia component in the waste solution and recovering a potassi... | 01/25/1994 |
| 4988491 | Flexible integration of the production of ammonia and urea The process of the present invention which produces the flexible integration for the production of ammonia and urea uses adiabatic reforming of the carbonaceous feedstock such as natural gas. With adiabatic reforming of natural gas, a surplus of carbon di... | 01/29/1991 |
| 4965061 | Process for removing fluoride from a wastewater and producing hydrofluoric acid therefrom A process for producing hydrofluoric acid from SiF62- in a wastewater is disclosed. The process is carried out by (i) combining (NH4)2 SO4, at a pH high enough such that the sulfate is in its divalent sta... | 10/23/1990 |
| 4882134 | Recovery of hydrogen fluoride from an aqueous solution containing ammonium fluoride and hydrogen fluoride A method of recovering HF from an aqueous solution containing NH4 F and HF is provided. The solution is contacted with a water-immiscible, amine-containing extractant which extracts HF in preference to NH4 F. The HF:NH4 F ... | 11/21/1989 |
| 4861490 | Removal of cationic impurities from inorganic solutions A process for the removal of cationic impurities from inorganic solutions and especially wet process phosphoric acid solutions wherein the solutions are passed through an ammonium ion or hydrogen ion charged cation exchange resin to remove various metal c... | 08/29/1989 |
| 4832930 | Decomposition of ammonium thiocyanate A process for decomposing ammonium thiocyanate and equivalent compounds comprising mixing the compounds with molten ammonium sulfate at atmospheric pressure and about 310° C. The compounds decompose giving off carbon dioxide, sulfur dioxide, ammonia and ... | 05/23/1989 |
| 4801356 | Removal of ammonia from fuel cell power plant water system Ammonia which is present in fuel cell power plant water in free form, in ionic form, and in forms combined with carbon dioxide, is removed from the power plant water by steam stripping. Water which has been used to cool the fuel reformer effluent, and thu... | 01/31/1989 |
| 4720375 | Process for producing magnesium oxide High purity magnesium oxide is obtained from a magnesite-containing ore, the impurities of which include calcium compounds. The ore is first calcined and the resulting magnesium oxide is converted to magnesium chloride by leaching with an ammonium chlorid... | 01/19/1988 |
| 4713231 | Process for the recovery of ammonia and fluoride values from ammonium fluoride solutions The components of aqueous ammonium fluoride solutions are recovered as ammonia and potassium fluoride by adding potassium hydroxide, distilling to remove and secure the ammonia, concentrating the remaining solution and combining it with a water soluble, d... | 12/15/1987 |
| 4710215 | Process for distillation-crystallization of zinc carbonate A process for distillation-crystallization of a zinc carbonate which is characterized in that a distillation column having a plurality of plates or trays is used for crystallizing basic zinc carbonate (2ZnCO3.3Zn(OH)2 or ZnCO3.3... | 12/01/1987 |
| 4460555 | Ammonia scavenger A process for making particulate substantially water-insoluble magnesium phosphate product and method of use of the product for removing ammonia from aqueous solutions. The particulate magnesium phosphate product acts as a remarkably effective scavenger w... | 07/17/1984 |
| 4432958 | Method for the selective removal and recovery of ammonia from ammonia- and hydrogen sulfide-containing gas mixtures The ammonia contained in ammonia- and hydrogen sulfide-containing gas mixtures is selectively removed through a gas washing with an aqueous ammonium sulfite-bisulfite solution, and recovered from the wash solution as a concentrated aqueous solution. For t... | 02/21/1984 |
| 4396463 | Method of purifying waste water A method of purifying waste water, for example waste water from a coking plant, comprises supplying waste water to be purified to the upper part of a stripping column comprising a plurality of substantially horizontal plates disposed above one another, su... | 08/02/1983 |
| 4394363 | Process for the granulation of precipitation products formed from ammonium compounds A process for the granulation of precipitation products, formed from the reaction of ammonium compounds with alkaline-earth compounds, by introducing into the bottom of a reaction chamber an ammonium and alkaline-earth compound such that the alkaline-eart... | 07/19/1983 |
| 4342735 | Stripping of aqueous ammonium carbonate solution In stripping ammonia and carbon dioxide from an aqueous ammonium carbonate solution including organic ammonium salts, inorganic base is introduced into the column at a point below the point of the feed introduction and above the column bottom to liberate ... | 08/03/1982 |
| 4336102 | Method for recovery and reuse of ammonia in ammonia-base sulfite cooking liquors A method for recovering ammonia from spent ammonia-base sulfite pulping liquor includes steam stripping spent ammonia and condensing the resulting vapor to produce a dilute ammonia or ammonium hydroxide solution. This dilute solution is passed through a c... | 06/22/1982 |
| 4311597 | Method and apparatus for treatment of wastewater A method of removing ammonia from a wastewater containing free and fixed ammonia said process comprising the steps of: distilling the wastewater to remove the free ammonia; treating the distilled wastewater with soda ash to decompose the fixed ammonia; an... | 01/19/1982 |
| 4308247 | Recovering nitrogen bases from a hydrosulfide/sulfur dioxide removal process A nitrogen base is separated from the sulfur-containing product of a gas phase reaction between a basic nitrogen compound and at least one of a hydrosulfide and sulfur dioxide by washing the product of the reaction, followed by basification and stripping ... | 12/29/1981 |
| 4305917 | Method for preparing ammonia and hydrogen chloride from ammonium chloride According to the present invention, ammonia and hydrogen chloride are prepared from ammonium chloride. The steps of the process include: 1. heating a mixture consisting essentially of (a) ammonium chloride, (b) a water-insoluble amine, and (c) an organic solvent; 2... | 12/15/1981 |
| 4302430 | Process for releasing ammonia bound in coal water A process for releasing ammonia which is bound in coal water using a pre-desulfurization plant having ammonia and hydrogen sulfide scrubbers through which crude coking plant gas is passed comprises circulating the crude coke oven gases through the hydroge... | 11/24/1981 |
