Disclosed are a system and a method for desulfurization and denitrification of an alumina calcination flue gas, and a use. The system comprises an ozone generator (1), a red mud pre-impregnation slurry scrubbing tower (3), and a red mud pre-impregnation tank (5) and a red mud pre-impregnation clear liquid scrubbing tower (10). NO.sub.x in a flue gas is oxidized into a high valence oxynitride by ozone, and with the red mud as an absorbent, the synergistic absorption of SO.sub.2 and NO.sub.x in the flue gas is achieved, while the dealkalization of the red mud is achieved. By means of the synergistic catalytic oxidation of metal ions such as Fe.sup.3+ in a red mud slurry and ozone, the synergistic absorption of sulfur and oxynitride is prompted and the material consumption of the subsequent desulfurization and denitrification is reduced; and the use of a structure of staged absorption in two towers overcomes the problem of the difficulty in absorbing NO.sub.2 with a low O.sub.3/NO.sub.x molar ratio by enhancing absorption with sodium alkali in a second stage tower, while decreasing the consumption of and risk of escape of the ozone, wherein same has the advantages of a high purification efficiency and a low operation cost, and has a stronger applicability to the alumina calcination flue gas.

Methods and systems for reducing greenhouse gas emissions, including producing a waste gas stream comprising form greater than 0 vol % to less than 20 vol %, inclusive, carbon dioxide, pre-concentrating the waste gas stream to increase a concentration of carbon dioxide, producing a concentrated byproduct stream comprising more than 40 vol %, dissolving carbon dioxide contained in the concentrated byproduct stream in water, producing a dissolved byproduct stream and an undissolved byproduct stream, injecting the dissolved byproduct stream or a portion thereof into a reservoir containing mafic rock, and allowing components of the dissolved byproduct stream to react in situ with components of the mafic rock to precipitate and store components of the byproduct stream in the reservoir.

The present application relates to a process for the reduction of NOx from a gaseous effluent generated in the production of fertilizer comprising the acid digestion of phosphate ore in the presence of urea, wherein said gaseous effluent generated has a NOx composition of 70 to 100 mole % NO.sub.2 and 0 to 30 mole % NO, comprising the steps of: a) contacting said gaseous effluent for 0.5 to 15 seconds with ozone, thereby providing a resultant gas mixture wherein NO and NO.sub.2 present in the NOx are oxidized to higher nitrogen oxides; and; b) removing higher nitrogen oxides from said resultant gas mixture; wherein urea is present during said acid digestion of phosphate ore in an amount of 0.25 wt % or less based on the weight of said phosphate ore; and; ozone is added to said gaseous effluent in an ozone/NOx ratio ranging between 0.5 and 1.4.

This disclosure relates to a process for steam plume suppression. The process involves using thermosyphon shell and tube heat exchangers to cool a hot gas stream, using a wet scrubber to clean the cooled hot gas stream and generate a wet gas comprising water vapor, and using thermosyphon shell and tube heat exchangers to heat the wet gas above the dew point. This disclosure also relates to a steam plume suppression system. The system involves thermosyphon shell and tube heat exchangers and a wet scrubber.

The present invention relates to a process for oxidative coupling of methane (OCM), comprising the steps of: (a) contacting, in a reactor, oxygen and methane with an OCM catalyst, resulting in a reactor effluent comprising ethylene, ethane, methane, carbon dioxide and water; (b) cooling the reactor effluent to obtain a liquid stream comprising water and a gas stream comprising ethylene, ethane, methane and carbon dioxide; (c) removing carbon dioxide from at least a part of the gas stream comprising ethylene, ethane, methane and carbon dioxide resulting in a gas stream comprising ethylene, ethane and methane; (d) passing at least a part of the gas stream comprising ethylene, ethane and methane as obtained in step (c) through a membrane, preferably a membrane comprising metal cations, more preferably a membrane comprising silver (I) ions (Ag.sup.+ ions) or copper (I) ions (Cu.sup.+ ions), to obtain a stream comprising ethane and a stream comprising ethylene.

The present invention relates generally to the field of emission control equipment for boilers, heaters, kilns, or other flue gas-, or combustion gas-, generating devices (e.g., those located at power plants, processing plants, etc.) and, in particular to a new and useful method and apparatus for reducing and/or eliminating various liquid discharges from one or more emission control equipment devices (e.g., one or more wet flue gas desulfurization (WFGD) units). In another embodiment, the method and apparatus of the present invention is designed to reduce and/or eliminate the amount of liquid waste that is discharged from a WFGD unit by subjecting the WFGD liquid waste to one or more drying processes, one or more spray dryer (or spray dry) absorber processes, and/or one or more spray dryer (or spray dry) evaporation processes.

Provided is a method for producing acetic acid, which includes an absorption step that suppresses corrosion inside a distillation column when a solution after that has absorbed a target component is subjected to distillation. The method for producing acetic acid according to an embodiment of the present invention includes an absorption step of supplying, to an absorption column, at least a portion of offgas generated in an acetic acid production process, bringing the offgas into contact with an absorbent containing one or more liquids selected from the group consisting of a hydrocarbon, an ester of a carboxylic acid having 3 or more carbon atoms, an ester of a carboxylic acid and an alcohol having 2 or more carbon atoms, and an ether, to allow the absorbent to absorb an iodine compound in the offgas, and separating into a gas component having a lower iodine compound concentration than the offgas and a solution containing the absorbent and the iodine compound.

A carbon dioxide reduction system includes: an absorption tower configured to bring a source gas containing carbon dioxide into contact with an absorption liquid composed of an aqueous solution containing at least one amine compound so that the carbon dioxide is absorbed in the absorption liquid; an electrolysis apparatus for electrolyzing the carbon dioxide absorbed in the absorption liquid in the absorption tower; and a circulation line for circulating the absorption liquid between the absorption tower and the electrolysis apparatus.

A gas trap system for metal organic chemical vapor deposition (MOCVD) exhaust abatement operations is provided. The gas trap system may include a housing including an inlet configured to receive exhaust gas and an outlet. The gas trap system may also include a conical inlet shield positioned within the housing. The conical inlet shield may form a first path between the housing and the conical inlet shield, wherein the first path receives the exhaust gas from the inlet. The conical inlet shield may also cool the exhaust gas and cause the exhaust gas to be uniformly distributed in the first path. The gas trap system may also include a filter configured to receive the exhaust gas from the first path and to filter the exhaust gas, wherein the filtered gas exhaust is provided to the outlet.

A method and a plant for capturing CO2 from an incoming flue gas. The flue gas can be exhaust gas from coal and gas fired power plants, cement factories or refineries. The incoming exhaust gas is cooled, mixed with air and compressed, and thereafter introduced into a combustion chamber together with gas and/or liquid fuel. Part of the combustion is achieved by separate burners with cooling/combustion air feed with a volume equal to the volume of CO2 captured. Said burners will elevate the temperature in the combustion chamber allowing combustion of exhaust gas with low oxygen content. CO2 is captured at high partial pressure before expansion by the gas turbine to produce power and generate steam in the heat recovery unit. The gas turbine will operate with high efficiency close to design parameters with respect to inlet temperature, pressure and flow.