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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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4070447 |
Process for preparing anhydrous aluminum fluoride
Ammonium tetrafluoroaluminate particles having an average particle size above 50μ are reacted with an aluminum compound such as aluminum hydroxide or oxide first at a temperature of 250° C to...
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4067957 |
Process for producing hydrogen fluoride from an aqueous hydrofluorosilicic acid solution
Potassium fluoride and silica are reacted with an aqueous solution of hydrofluorosilicic acid. The resulting potassium fluorosilicate is recovered. The potassium fluorosilicate may be further...
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4061718 |
Method for the recovery of ammonia from liquor from the filters of ammonia-soda plants
A method for the recovery of ammonia from liquor from the filters of ammonia-soda plants, which contains free ammonia and ammonium chloride. In this method the liquor is heated to release the free...
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4058591 |
Process for purifying waste water containing ammonium sulfate
This process for purifying waste-water containing ammonium sulfate comprises reacting said waste-water with calcium oxide, calcium sulfide and ammonium sulfite; roasting the resulting precipitate...
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4054562 |
Process for the manufacture of lactams
In a process for manufacturing a lactam which includes rearranging a cycloalkanone-oxime with sulfuric acid to form the lactam, neutralizing the rearrangement mixture with ammonia to form ammonium...
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4039649 |
Process for removing sulfur from waste waters containing sulfuric acid
Process for recovering sulfur from waste waters containing sulfuric acid, comprising reacting in a first step, the waste water with an aqueous solution of ammonium sulfite, separating the formed...
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4036943 |
Process for removing sulfur dioxide from a gas and producing sulfur therefrom
A SO 2 -containing gas is contacted with an ammonia solution, the resulting ammonium sulfite solution is vaporized to SO 2 and NH 3 , SO 2 is partially reduced to H 2 S and the resulting gas...
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4029744 |
Process for removing the salt of a weak acid and a weak base from solution
The salt of a weak acid and a weak base is removed from a solution by contacting said solution with an emulsion. Said emulsion comprises an exterior phase which is characterized as immiscible with...
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4029745 |
Process for reducing molten ammonium sulfates containing metallic impurities to ammonia and sulfur dioxide
Molten ammonium sulfates containing iron sulfate as an impurity may be reduced with sulfur or a sulfur compound over long periods provided a fraction of these impure ammonium sulfates is withdrawn,...
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4003986 |
Process for producing sulfur from sulfur dioxide or ammonium sulfites
A method is disclosed for treating flue gas and the like for sulfur dioxide removal and sulfur recovery. The flue gas, containing a minor but polluting amount of sulfur dioxide, is contacted with...
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4002729 |
Method for thermochemical decomposition of water
Water is thermochemically decomposed to produce hydrogen by the following sequence of reactions: KI, NH 3 , CO 2 and water in an organic solvent such as ethyl or propyl alcohol are reacted to...
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3996342 |
Method for thermochemical production of hydrogen from water
A method for the thermochemical production of hydrogen from water is disclosed in which barium iodide, carbon dioxide, ammonia and water are allowed to react with one another and give rise to...
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3991047 |
Process for preparing lactams
In a process for the preparation of lactam from cycloalkanone comprising reacting said alkanone with hydroxylamine sulfate to form the corresponding cycloalkanone oxime followed by Beckman...
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3989809 |
Process for the recovery of sulfur
Elemental sulfur is recovered from ammonium salts of sulfuric oxyacids (e.g. ammonium sulfate, ammonium hydrogen sulfite, and ammonium sulfite) by passing the salt (e.g. in aqueous solution) and a...
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3983224 |
Anhydrous magnesium chloride process
Anhydrous magnesium chloride may be prepared for magnesium chloride hydrate by the following sequence of process steps: A. mixing together a magnesium chloride hydrate said hydrate containing...
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3974257 |
Process for removing sulfur dioxide contained in a gas
A SO 2 containing gas, for example a stack gas, is purified according to a multi-step process, which comprises washing said gas with an aqueous ammonia solution, treating the resulting solution...
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3965245 |
Method for preparing alkali metal orthophosphates and ammonia in a single step
A selected ammonium phosphate is reacted at elevated temperature and pressure with sodium hydroxide in a vertical column having vapor-liquid contact means to produce an alkali metal orthophosphate...
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3939254 |
Process for preparing alkali metal orthophosphates and ammonia
Aqueous monoammonium phosphate is reacted at elevated temperature with sodium carbonate in a vertical column having vapor-liquid contact means to produce an aqueous solution of sodium ammonium...
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3935100 |
Process for the treatment of waste waters containing sulfuric acid and/or ammonium sulfate
Process for treating a waste water containing sulfuric acid and/or ammonium sulfate comprising (1) reacting said water with barium sulfide to form barium sulfate, (2) reacting the latter with...
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3929977 |
Method for the thermal conversion of ammonium sulfate to ammonium bisulfate
The method of the present invention for thermally converting ammonium sulfate to ammonium bisulfate includes fusing a mixture of ammonium sulfate and bisulfate with heat to form a molten salt...
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3928536 |
Processes for removal of sulfur dioxide from gases
A method is disclosed for treating flue gas and the like for sulfur dioxide removal and recovery. The gas, containing a minor but polluting amount of sulfur dioxide, is contacted with ammonia in a...
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3911092 |
Method for converting ammonium sulfate to ammonium bisulfate
A method and apparatus illustrated by two embodiments, for efficiently converting ammonium sulfate to ammonium bisulfate. In both embodiments, a second stage receives ammonium sulfate dissolved in...
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3864192 |
APPARATUS FOR PRODUCING AMMONIA-BASE PULPING LIQUOR FROM SPENT LIQUOR
Ammonia-base bisulfite spent pulping liquor is combined with magnesia thereby freeing ammonia and forming dilute magnesium-base bisulfite spent liquor. The mixture is concentrated by use of heat...
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3846538 |
PROCESS FOR REGENERATING STRONG BASES FROM SOLUTIONS OF THEIR SULFIDES AND SIMULTANEOUSLY PRODUCING SULFUR
Process for regenerating a strong base from an aqueous solution of a sulfide thereof comprising (a) contacting said sulfide with an ammonium salt of a strong inorganic acid or an organic acid of...
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3761575 |
PROCESS FOR THE CRACKING OF AMMONIUM SULFATE
For converting ammonium sulfate into ammonia and sulfur dioxide, the steps of: (a) heating ammonium sulfate to 300°-500° C. to produce ammonia and ammonium bisulfate; and (b) burning resultant...
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3649190 |
A PROCESS FOR THE RECOVERY OF AMMONIA, SULFUR DIOXIDE, CARBON DIOXIDE AND HYDROGEN SULFIDE FROM GAS STREAMS AND FROM AMMONIUM SULFITES, SULFIDES AND CARBONATES
A process for separating volatile bases (B'), e.g., NH 3 and weak volatile acids (A'H), e.g., H 2 S from their salts or the liquid or gaseous dissociation products thereof, comprising, in a first...
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3634037 |
TREATMENT OF A WATER STREAM CONTAINING AMMONIUM SULFIDE SALTS
A water stream containing NH 4 HS is treated to produce elemental sulfur, an ammoniacal aqueous stream and a treated water stream by the steps of: (a) catalytically treating the water stream with...
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3536619 |
TREATMENT OF AN AQUEOUS WASTE STREAM FROM A HYDROCARBON CONVERSION PROCESS
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3525590 |
PROCESS AND APPARATUS FOR THE PREPARATION OF AMMONIA AND CHLORINE FROM AMMONIUM CHLORIDE
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3505217 |
PROCESS FOR THE DESTRUCTION OF CYANIDE IN WASTE SOLUTIONS
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3502431 |
PROCESS AND REACTANTS FOR THE PREPARATION OF AMMONIA AND HYDROCHLORIC ACID FROM AMMONIUM CHLORIDE
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3471256 |
PREPARATION OF AMMONIA AND HYDROCHLORIC ACID FROM AMMONIUM CHLORIDE
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3447895 |
METHOD OF PREVENTING SMELT-WATER EXPLOSIONS
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3446589 |
IRON-BASED CATALYSTS,THEIR PREPARATION AND THEIR USES
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3428426 |
AMMONIA STRIPPING PROCESS
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3428418 |
AMMONIUM NITRATE STABILIZATION
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3410657 |
Catalytic process and composition for the production of ammonia and chlorine from ammonium chloride
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3404099 |
Process for the preparation of iron-base catalytic masses and the resulting products
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3402999 |
Process and apparatus for the preparation of ammonia and chlorine from ammonium chloride
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3393048 |
Process for the dissociation of ammonium salts
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3383170 |
Process for the recovery of sulphur dioxide and ammonia
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3342547 |
Method for the production of high purity dense nickel oxide and the product thereof
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3333916 |
Process for producing pure fused vanadium oxide from ammonium metavanadate
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3321275 |
Process for recovering sulfur dioxide and ammonia from aqueous scrubbing solution obtained from ammonia scrubbing of gases containing sulfur oxides
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3292996 |
Method of recovery of sulfur oxides and ammonia
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3275407 |
Method of recovery of ammonia and sulfur dioxide
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3243261 |
Process for obtaining ammonia and sulfur oxides from ammonium sulfate liquors
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3218254 |
Treatment of toxic copper-containing solutions
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3193353 |
Method of removing carbon dioxide from ammonia
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