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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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 (NH 3 ), is introduced into the flue gas flow. For achieving a high degree...
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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...
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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...
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4965061 |
Process for removing fluoride from a wastewater and producing hydrofluoric acid therefrom
A process for producing hydrofluoric acid from SiF 6 2 - in a wastewater is disclosed. The process is carried out by (i) combining (NH 4 ) 2 SO 4 , at a pH high enough such that the sulfate is...
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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 NH 4 F and HF is provided. The solution is contacted with a water-immiscible, amine-containing extractant which extracts HF in...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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)...
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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...
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4293532 |
Process for producing hydrogen chloride and ammonia
A process for producing hydrogen chloride and ammonia, comprising the steps of carrying out the reaction of ammonium chloride with ammonium hydrogen sulfate in the state of molten salt to produce...
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4271013 |
Method and apparatus for removing biodegradable compounds from wastewater
A method for removing biodegradable compounds selected from the group comprising: phenolics, free and fixed ammonia compounds, thiosulfates, cyanides, thiocyanates, sulfides and the like from a...
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4263145 |
Recovery of ammonia or amine from a cation exchange resin
Ammonia or an amine such as morpholine is recovered from a resin bed comprising an alkali metal, e.g., sodium, and ammonium or amine salts of a strong acid cation exchange resin by contacting the...
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4220634 |
Process for converting ammonium imidodisulfate, ammonium sulfamate and ammonium dithionate to sulfur dioxide and ammonia
Ammonium imidodisulfate and ammonium sulfamate may be converted to sulfur dioxide and ammonia by heating them with a reducing agent or a catalyst in a bath of molten ammonium sulfate and ammonium...
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4208390 |
Process for the recovery of ammonia and sulphur dioxide from a contaminated ammonium salt of sulphuric acid
An improved process for the recovery of ammonia and sulphur dioxide from a by-product mixture containing an ammonium salt of sulphuric acid obtained as a by-product in the preparation of...
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4201759 |
Method for regenerating calcium sulfoxy compounds produced in the combustion of carbonaceous fuels in fluidized beds
In methods for combusting carbonaceous sulfur-containing fuels in a fluidized bed wherein the fluidized bed contains at least one calcium compound selected from the group consisting of calcium...
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4201754 |
Method for the conversion of calcium sulfoxy compounds into calcium carbonate compounds in sulfur oxide treatment processes
A method for converting calcium sulfoxy compounds selected from the group consisting of CaSO x and Ca(HSO x ) 2 and their hydrates wherein x is 3 or 4 into calcium carbonate, the method...
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4187280 |
Process for recovering useable products from by-product ammonium nitrate formed in the manufacture of nuclear reactor fuels or breeder materials
Radiation-contaminated ammonium nitrate is heated in solution to about 100° C. in the presence of finely powdered calcium oxide or lithium hydroxide. Ammonia and water vapor are given off leaving...
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4180550 |
Process for purifying a sulfur dioxide containing gas by washing with an ammonia aqueous solution
Process for purifying a sulfur dioxide containing gas, by washing with an ammonia aqueous solution, comprising the following steps: (a) contacting a sulfur dioxide containing gas with ammonia...
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4172017 |
Process for producing chlorine from ammonium chloride
A process for producing chlorine from ammonium chloride which comprises vaporizing ammonium chloride, contacting the vapors with a metal selected from the group consisting of tin, zinc and cadmium...
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4165264 |
Ammonia leaching
An improved process for obtaining copper from a copper sulfide, in which: the copper sulfide is treated with oxygen and an aqueous leaching solution of ammonium carbonate, to form a leach liquor...
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4163043 |
Process for removing H.sub.2 S and CO.sub.2 from gases and regenerating the adsorbing solution
H 2 S and CO 2 from a waste gas are absorbed in an ammoniacal or alkali metal hydroxide solution. The resultant sodium, potassium or ammonium sulfide solution is reacted with pulverized copper...
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4160725 |
Waste water purification processes
Waste water from coke ovens is purified by passing the waste water and a stripping fluid through a stripping column in counterflow. Non-volatile ammonium compounds are removed in one region of the...
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4140586 |
Method and apparatus for distillation
The thermal efficiency of an ammonia still is significantly increased by the use, in conjunction with the usual countercurrent steam stripping medium, of an auxiliary inert gas stripping medium...
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4110423 |
Production of chlorine and ammonia
A reaction mass for use in the preparation of chlorine and ammonia by contact with ammonium chloride, in which the reaction mass contains iron oxide which is capable of chemically combining with...
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