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8173090 |
Sorbent use with oxyfuel sour compression
Sulfur dioxide (SO2) is removed from carbon dioxide feed gas comprising SO2 as a contaminant by maintaining the carbon dioxide feed gas at an elevated pressure in contact with an alkaline sorbent...
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7988942 |
Method and system for concentrating waste sulphuric acids from nitration processes
A method for recovering diluted waste sulfuric acid by extractive rectification with concentrated sulfuric acid which is re-concentrated for reutilization. Waste sulfuric acid from the nitration...
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7964166 |
Process for removing contaminants from gas streams
The present invention provides for process for inhibiting the levels of nitrogen oxides in process gas streams from sulfuric acid regeneration and production plants. The process gas stream from the...
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7927573 |
Multi-stage process for purifying carbon dioxide and producing acid
Carbon dioxide is purified by processes employing NOx-rich sulfuric acid that can be formed by removal of SO2 from the carbon dioxide.
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7927572 |
Purifying carbon dioxide and producing acid
Carbon dioxide is purified by processes employing NOx-rich sulfuric acid that can be formed by removal of SO2 from the carbon dioxide.
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7632475 |
Process for removing contaminants from gas streams
The present invention provides for process for inhibiting the levels of nitrogen oxides in process gas streams from sulfuric acid regeneration and production plants. The process gas stream from the...
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7416716 |
Purification of carbon dioxide
SO2 and/or NOx are removed from gaseous CO2 at elevated pressure(s) in the presence of molecular oxygen and water and, when SO2 is to be removed, NOx, to convert SO2 to sulfuric acid and/or NOx to...
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7252813 |
Process for condensation of sulphuric acid vapours to produce sulphuric acid
A process for production of sulphuric acid comprising condensing sulphuric acid vapour from a gas mixture containing 0.01 to 10 vol. % of H2SO4 vapour calculated at complete hydration of SO3 in the...
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6893622 |
Process for the combustion of sulphur for the preparation of oleum and sulphuric acid with reduced (NO)x content
The invention relates to a process for the continuous preparation of oleum of a concentration of 10 to 45% by weight of SO3 and/or sulphuric acid of a concentration of 94 to 100% by weight of H2SO4...
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6740302 |
Method for producing high-purity sulphuric acid
The invention relates to a novel method for producing high-purity sulfuric acid for use in the semiconductor industry. The method comprises the addition of a hydrogen peroxide solution to an...
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6627172 |
Process for preparing sulphuric acid from gases containing SO3 and gaseous nitrosylsulphuric acid
Process for preparing sulphuric acid from gasses containing SO3 and gaseous nitrosylsulphuric acid (NO+HSO4− or HO3SONO) by contact with 94% to 98% sulphuric acid, wherein the gases flow through a...
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6342651 |
Reductive combustion of ammonium salts of sulfuric acid
A process is provided for the combustion of ammonium salts of sulfuric acid contained in aqueous media. More particularly, a reductive combustion process which produces a combustion gas containing...
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6156288 |
Process for purifying and concentrating spent sulfuric acids
A process is provided for the purification of sulfuric acid contaminated with impurities, such as nitric acid, nitrosylsulfuric acid, dinitrotoluenes and mononitrotoluenes, wherein this...
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6146612 |
Method for recovering sulfuric acid from sulfate salts
A process is provided for the recovery of sulfuric acid from NH4 HSO4 and (NH4)2 SO4 salts produced from the sulfuric acid hydrolysis of methylmercaptopropionaldehyde (MMP) cyanohydrin to produce...
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5955050 |
Nox destruction in sulphuric acid
A process is provided for the destruction of nitrogen oxides in sulfuric acid by adding a reducing agent, such as hydrazine, sulfamic acid or urea, and an oxidizing agent, such as hydrogen peroxide...
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5788949 |
Liquid phase conversion of a source of sulfur dioxide to sulfuric acid
A process for producing in liquid phase, concentrated sulfuric acid in the liquid phase from a source of sulfur dioxide, is described. The process comprises, converting the source of sulfur dioxide...
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5670127 |
Process for the manufacture of nitric oxide
Nitric oxide is produced by reacting aqueous nitric acid with gaseous sulfur dioxide in a gas-liquid contact reactor. The reaction is conducted in the presence of a stoichiometric excess of nitric...
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5494869 |
Process for regenerating nitrogen-treated carbonaceous chars used for hydrogen sulfide removal
A process is provided for the restoration of hydrogen sulfide removal capacity in nitrogen-treated carbonaceous chars which have become exhausted for hydrogen sulfide capacity when used for the...
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5456891 |
Process for the purification of contaminated exhaust gases from incineration plants
A process, using regenerable adsorption materials, for purifying exhaust gases that have been contaminated with at least SO2, a heavy metal such as mercury and additional toxic gases such as...
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5389354 |
Process for the production of oleum and sulfuric acid
In the continuous production of oleum having a concentration of 10 to 45% by weight SO3 and/or sulfuric acid having a concentration of 94 to 100% by weight H2 SO4 by burning sulfur with...
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5308600 |
Process for conditioning waste sulfuric acid
Process for conditioning waste sulfuric acid which is prone to precipitation of tars or resins, which comprises adding emulsifiers, preferably long-chain polyethers, to the waste sulfuric acid.
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5145521 |
Sulfuric acid/polyamide compositions
Solutions of sulfuric acid having a polyamide, such as gelatin, dissolved therein are less corrosive than polyamide-free solutions of sulfuric acid of equal sulfuric acid concentration, while...
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5030436 |
Spent acid purification process
Contaminants in spent nitric-sulfuric nitration acid can be removed by mixing the spent acid with urea and heating to 75°-150° C. Off-gas from the spent acid/urea reaction is passed through a G...
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5026535 |
Method for decoloring sulphuric acid deriving from acid production processes
The present invention relates to a method for decoloring sulphuric acid produced in accordance with the contact method, comprising one or more absorption circuits. The produced sulphuric acid is...
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4590047 |
Method for desulfurizing combustion gases
A process and apparatus for removing sulfur oxides and nitrogen oxides from the gaseous combustion products of sulfur-containing fossil fuel, such as high sulfur coal, comprising passing the...
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4557912 |
Air pollution reduction
The method of reducing air pollution comprises treating air-polluting waste industrial flue gases containing sulfur dioxide in a manner effective to substantially reduce the content of sulfur...
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4426364 |
Removal and recovery of nitrogen oxides and sulfur dioxide from gaseous mixtures containing them
A cyclic process for removing lower valence nitrogen oxides from gaseous mixtures includes treating the mixtures in a first stage with an acidic aqueous media including a peroxygen oxidant to form...
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4400362 |
Removal of nitrogen oxides from gas
Gas containing nitrogen oxides is treated in two separate stages. In the first stage, the nitrogen oxides in the gas are reacted with sulfurous acid. The gaseous product of this reaction is reacted...
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4384924 |
Method of separating acids and bases which have been carried along in the vapors formed during distillation
A method of separating acids or bases from vapors which are conveyed along with distillation vapors during concentration of a solution, comprising, passing said distillation vapors containing an...
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4358427 |
Removal of hydrogen sulfide from geothermal steam
A process for removing hydrogen sulfide from geothermal steam comprising adding free oxygen to the steam and contacting the steam with an oxidation catalyst at a pressure of at least 30 psig and a...
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4285924 |
Separation of acids
A method for the separation of nitric acid from a mixture of nitric acid with one or more of phosphoric, sulphuric or hydrochloric acids, in which the nitric acid is selectively extracted from a...
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4257986 |
Process for refining aqueous acid mixtures utilized in nitration of aromatics
This invention relates to an improvement in a process for the manufacture of a nitroaromatic compound produced by the mixed sulfuric-nitric acid nitration method. The improvement resides in the...
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4242321 |
Process for separating SO2 from a current of gas containing the same, and plant for carrying out such process
A process is described for separating SO2 from a current of gas containing the same, at least intermittently, in a concentration which is impermissibly high for discharge into the ambient...
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4155989 |
Removal of nitric acid from nitric acid-sulfuric acid mixtures
Mixtures of nitric acid and sulfuric acid containing in excess of 70% sulfuric acid are denitrated by the addition of sufficient sulfur dioxide to such mixtures to convert the nitric acid to...
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4150103 |
Foam prevention during the regeneration of waste sulfuric acid with aromatic nitro compounds
The foam formation arising when aqueous waste sulfuric acid is concentrated can be suppressed by adding aromatic nitro compounds such as nitrobenzene to the acid.
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4044111 |
Method of treating calcium nitrate contained in denitration waste liquid
The present invention provides a method of converting NO3- ions which are contained in denitration waste liquids to nonpoisonous N2 gas or to valuable by-products. In the method of the invention,...
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4014982 |
Combined process for upgrading spent alkylation acid and reducing noxious gas content of waste gaseous streams
The effluent streams from utility stack gases containing nitric oxides and sulfur dioxide are sequentially oxidized, absorbed with effluent spent alkylation acid, the unabsorbed remaining gases...
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4010240 |
Process for the regeneration of sulfuric acid
Contaminated sulfuric acid which may contain water, organic compounds and inorganic salts is converted to almost pure concentrated sulfuric acid by passing the acid through a Pauling plant and...
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3993730 |
Purification of coke oven gas with production of sulfuric acid and ammonium sulfate
A continuous process is provided which has the primary purpose of removing NH3, H2 S, HCN, and (CN)2 from the subject gas mixtures and the secondary purpose of producing (NH4)2 SO4 and iron oxide...
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3981975 |
Preparation of anhydrous nitric acid
A method for preparing anhydrous nitric acid comprising extracting an aqueous mixture of nitric acid and sulfuric acid with methylene chloride to yield a solution of anhydrous nitric acid in...
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3977830 |
Silver nitrite reactant for measuring SO2
Sulphur dioxide is reacted with silver nitrite at room temperature to release nitrogen dioxide in a known ratio and the nitrogen dioxide may, then, be measured as an indication of the presence and...
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3972987 |
Process for regenerating sulfuric acid
Two-step-process for regenerating dilute sulfuric acid which may contain organic and inorganic impurities such as heavy metal salts. In the first step the impure acid is distilled in vacuo and in...
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3549320 |
REGENERATION OF ACID
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3506396 |
NITRIC ACID PRODUCTION
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3682593 |
METHOD OF MANUFACTURE OF SULFUR DIOXIDE FROM SULFUROUS MATERIALS CONTAINING NITROGEN COMPOUNDS
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3364202 |
Process for the recovery of free sulfuric acid from ammonium bisulfate
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3069233 |
Process for converting nitrosyl chloride to nitrogen oxide and an aqueous solution of acids
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3012854 |
Incorporating hydrazine sulfate or dihydrazine sulfate into sulfuric acid
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2971819 |
Process for improving the quality of sulfuric acid
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2955920 |
Decarbonization of spent acids
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