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3983217 |
Method for removing sulfur dioxide from waste gases
A method for removing sulfur dioxide from waste gases by a wet oxidation-absorption method, which is characterized in that an aqueous solution of ammonium sulfate acidified with sulfuric acid at a...
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3980756 |
Air pollution control system
Gases containing SO 2 from a furnace are contacted in the scrubbing zone of a scrubber with an aqueous scrubbing medium containing solid alkaline earth metal carbonate, seed crystals of alkaline...
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3972980 |
Process removing sulfur dioxide from gases
A sulfur dioxide containing gas stream is passed through a gas scrubber through which is circulated a scrubbing medium, preferably slurried, containing a reactant which reacts with the sulfur...
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3971844 |
Method for removing sodium sulfate from aqueous solutions
Metal, e.g. sodium sulfate, is separated from metal, e.g. sodium sulfite, in a solution, for instance a solution used in a system involving contact of sulfur dioxide-containing gases with the...
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3966878 |
Method for removing pollutants from a gaseous mixture
Method and apparatus for treating of waste gases, such as hot-flue gases, to remove therefrom pollutants in the form of solids, such as fly-ash and the like; and also for the removal of chemical...
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3961021 |
Method for removing sulfur dioxide from combustion exhaust gas
Sulfur dioxide can be removed from a combustion exhaust gas and converted to gypsum by first scrubbing a sulfur dioxide-containing combustion exhaust gas with an aqueous alkali sulfite solution to...
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3957951 |
Process for removing contaminants from hot waste gas streams
A process for removing sulfur dioxide and other contaminants from a hot waste gas stream in which the waste gas stream is cooled to a temperature below 100°F and then passed in sequence through...
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3944649 |
Multistage process for removing sulfur dioxide from stack gases
Method and apparatus for removing sulfur dioxide from stack gases. The stack gases are scrubbed with an aqueous wash liquid containing one or more alkali metal compounds which react to form the...
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3937787 |
Treatment of gases containing sulfur dioxide
An improvement in regenerative SO 2 scrubbing systems which use sodium, potassium or ammonium carbonate to react with the SO 2 to form sulfite, wherein a thiosulfate-rich aqueous solution of the...
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3937788 |
Treatment of gases containing sulfur dioxide
An improvement in wet regenerative SO 2 scrubbing systems using a sulfite-forming additive wherein a thiosulfate-rich aqueous solution is used to prevent oxidation of sulfite to sulfate, to serve...
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3918521 |
Petroleum production by steam injection
This specification discloses a method of producing petroleum from a petroleum-bearing formation. A heated fluid is generated in a heated fluid generator that is fired with a sulfur-containing fuel...
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3911084 |
Process for separating sulfur oxides from gas streams
Sulfur oxides, particularly sulfur dioxide, present in waste gas streams are separated therefrom by contacting the sulfur oxides with a sodium sulfite-sodium bisulfite extraction liquor having a pH...
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3906080 |
Removal of sulfur dioxide from gases containing sulfur dioxide and oxygen
An improvement in the selective removal of SO 2 from gases containing SO 2 and O 2 wherein a thiosulfate-rich aqueous solution containing a sulfite-forming additive is used as the selective SO 2...
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3888968 |
Method of separating impurities for removal in desulfurization of effluent gas in a wet lime-gypsum process
A method of separating impurities for removal in the desulfurization of effluent gas in a wet lime-gypsum process wherein sulfur oxide is removed from sulfur oxide-containing gas using lime slurry...
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3880983 |
Flue gas desulfurization with ammonium sulfite-bisulfite solution
Flue gas is desulfurized by absorption in an aqueous ammonium sulfite-ammonium bisulfite solution. Any ammonia which is picked up in the flue gas during desulfurization is removed by scrubbing the...
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3873532 |
Sulfur dioxide scrubbing process
Sulfur dioxide is scrubbed from stack gases in an absorption device by a sodium-based aqueous scrubbing solution, a portion of which is subsequently and continuously regenerated outside the...
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3843789 |
REMOVAL OF SULFUR OXIDES FROM STACK GAS
The plume of particulate matter emitted in the vapor effluent from ammoniacal scrubbing of sulfur dioxide from flue gases is prevented or eliminated by maintaining controlled operating conditions.
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3816240 |
MINIMIZING SULFUR OXIDATION IN PULPING LIQUOR RECONSTITUTION
Disclosed is an improved process for the liquid phase coking of spent wood pulping liquors wherein a part of the decoked effluent is flash vaporized to supply condensate for SO 2 absorption, thus...
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3775094 |
COLLECTION OF SULFUR VALUES FROM FLUE GASSES GENERATED BY METALLIC SULFIDE SMELTING AND CONVERTING
In the processing of nonferrous sulfide ores, the resulting flue gas, which contains sulfur dioxide, is passed through an aqueous scrubber containing calcium sulfate or calcium sulfite. The...
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3733777 |
FLUE GAS RECOVERY METHOD AND APPARATUS
The invention is an improved process for the recovery of, for example, sulfur dioxide and heat from hot flue gas employing direct contact packed-bed heat exchangers, a packed bed absorber and...
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3723595 |
PROCESS FOR RECOVERING VOLATILIZED RHENIUM OXIDES AND SULFUR OXIDES FROM GAS STREAMS
A gas stream containing a silfur oxide and a volatilized rhenium oxide is scrubbed with an aqueous alkaline solution containing ions capable of forming sulfites and bisulfites, e.g., an ammonium or...
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3719742 |
PROCESS FOR THE REMOVAL OF SULFUR DIOXIDE FROM A SULFUR DIOXIDE-CONTAINING GAS
A process for treating metal pyrosulfites such as potassium, cesium, and rubidium pyrosulfites to obtain the corresponding metal sulfide therefrom is disclosed, particularly in a system where the...
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3653823 |
REMOVAL OF SULFUR DIOXIDE FROM GAS STREAMS
A gas stream containing sulfur dioxide, such as a waste or flue gas, is scrubbed with a circulating aqueous slurry containing magnesium oxide and magnesium sulfite, to remove sulfur dioxide from...
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3653812 |
PROCESS FOR REMOVAL OF SULFUR DIOXIDE FROM GAS STREAMS
The disclosure is of an improvement in a sulfur dioxide removal process wherein a sulfur dioxide-containing gas is contacted with an aqueous absorbing solution of a metal sulfite, e.g., sodium...
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3647363 |
RECOVERY OF SULFUR VALUES FROM FLUE GASES WITH OXIDIZED NEUTRAL SULFITE GREEN LIQUOR
A process for the utilization of sulfur compounds in spent pulping liquors and flue gases, said process including the oxidation of neutral sulfite green liquor with air or oxygen under heat and...
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3617212 |
RECOVERY OF SULFUR DIOXIDE FROM WASTE GASES
A process is provided to efficiently and economically absorb and recover sulfur dioxide gas, and thus eliminate air pollution and produce a useful sulfur-containing product. Sulfur dioxide is...
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3615198 |
PROCESS EMPLOYING POTASSIUM SULFITE FOR RECOVERING SULFUR DIOXIDE FROM GASES CONTAINING SAME
Sulfur dioxide is recovered from waste gases by contacting the gas with aqueous potassium sulfite to produce potassium bisulfite and subsequently separating the bisulfite and SO 2 -partial...
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3615199 |
PROCESS AND APPARATUS FOR PURIFYING GAS
Apparatus and process for preventing plugging of a reactor used in a system involving reaction between components, e.g. SO 2 , in a gas and a salt solution, e.g. a sulfite solution which is close...
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3615165 |
GASEOUS SULFUR DIOXIDE ABSORPTION SYSTEM
A system for the absorption of SO 2 from gases of combustion where the gases are passed in series through a plurality of direct contact zones. The absorption liquid is made up of a solution of...
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3485581 |
PROCESS FOR RECOVERING SULFUR DIOXIDE FROM GASES CONTAINING SAME
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3421848 |
PROCESS FOR THE ADVANTAGEOUS UTILIZATION OF SO2 AND NH3 FROM THE PRODUCTION OF NITROGEN AND PHOSPHATIC FERTILIZERS
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3261662 |
Absorption of sulphur dioxide and separation of ashes from combustion gases obtained by combustion of magnesium wastelye
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3808325 |
Title is not available
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3842160 |
Title is not available
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3784680 |
Title is not available
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3687624 |
Title is not available
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3833710 |
Title is not available
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3840638 |
Title is not available
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3687623 |
Title is not available
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3556722 |
Title is not available
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3826812 |
Title is not available
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3775532 |
Title is not available
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3790660 |
Title is not available
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3627464 |
Title is not available
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3821110 |
Title is not available
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3687625 |
Title is not available
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