A fluid processing system and method of processing a fluid includes a tank having an outer wall, a heating element, and an insulating element. The heating element is situated within the tank and includes a first electrode and a second electrode. The insulating element is positioned between the first electrode and the second electrode. As such, powering the heating element directs an electric current through the fluid within the tank for heating the fluid, while the insulating element provides electrical and thermal insulation to the outer wall of the tank.

A combustible gas from carbon black production is utilized in a gas engine by adding an oxygen-containing gas to the combustible gas, passing said mixed gas over a selective catalyst, which is active for oxidizing H.sub.2S to SO.sub.2 but substantially inactive for oxidation of CO, H.sub.2 and other hydrocarbons with less than 4 C-atoms, passing the converted gas through an SO.sub.2 removal step, and passing the cleaned gas to a gas engine or to an energy recovery boiler. This way, the tail gas from carbon black production, which is normally combusted in a CO boiler or incinerated, can be utilized to good effect.

The present disclosure relates to a flue gas treatment system (e.g. a multi-pollutant flue gas treatment system) for removal of greenhouse gases such as SO.sub.2, NO, NO.sub.2, H.sub.2S, HCl, water and CO.sub.2 as well as heavy metals (e.g. mercury, arsenic, bismuth, cadmium, lead and/or selenium) from the flue gases of fossil-fueled utility and industrial plants by reacting the raw flue gas, firstly, with chlorine in a gas-phase oxidation reaction and recovering the resulting products as marketable products, and then, secondly, treating the cleaned gas, which includes CO.sub.2, with a Sabatier reaction to produce a hydrocarbon fuel (e.g. methane). The system also includes an electrolytic unit for electrolyzing HCl to produce hydrogen gas for the Sabatier reaction as well as chlorine gas, which may then be recycled into the reactor.

A process for discharging high-temperature flue gas safely from an ocean platform includes discharging the gas from combustion facilities into a main body of a cooling and cleaning device through an exhaust pipe, while sea water is injected into the main body. The injected water passes through a water distributor located at an upper part, and the scrubbing sea water is sprayed downwards. The high-temperature flue gas enters into a lower part, and the gas is scrubbed by the sprayed sea water to be low-temperature clean flue gas. The low-temperature clean flue gas passes through the water distributor and a mist eliminator, and is discharged into atmosphere through an outlet at a top of the main body. The sea water is collected to a liquid pool located at a lower part of the main body and discharged into the ocean. A cooling and cleaning device is also disclosed.

Oxygen is removed from a gas feed such as a landfill gas, a digester gas or an industrial CO.sub.2 off-gas by removing sulfur-containing compounds and siloxanes from the feed gas, heating the feed gas, injecting one or more reactants for oxygen conversion into the heated feed gas, carrying out a selective catalytic oxygen conversion in at least onesuitable reactor and cleaning the resulting oxygen-depleted gas. The reactants to be injected comprise one or more of H.sub.2, CO, ammonia, urea, methanol, ethanol and dimethylether (DME).

The present disclosure relates to a hydroxyl group-containing amine-based sulfur dioxide and sulfurous absorbent, and a method for preparing the same. The absorbent uses an ionic liquid in the form of a salt including a diamine compound substituted with a hydroxyl group, and can be used as an absorbent capable of removing not only sulfur dioxide (SO.sub.2) but also sulfurous acid (H.sub.2SO.sub.3) formed by combination of sulfur dioxide with water.

Oxygen is removed from a gas feed such as a landfill gas, a digester gas or an industrial CO.sub.2 off-gas by heating the feed gas, optionally removing siloxanes and silanols from the heated feed gas, optionally removing part of the sulfur-containing compounds in the heated feed gas, injecting one or more reactants for oxygen conversion into the heated feed gas, carrying out a selective catalytic conversion of any or all of the volatile organic compounds (VOCs) present in the gas, including sulfur-containing compounds, chlorine-containing compounds and any of the reactants injected, in at least one suitable reactor, and cleaning the resulting oxygen-depleted gas. The reactants to be injected comprise one or more of H.sub.2, CO, ammonia, urea, methanol, ethanol and dimethyl ether (DME).

This invention is directed to a method used to remove gases from industrial exhaust streams, and in particular, to a method for removing sulfur dioxide from flue gases, with molten carbonate and treating the resulting molten mixture with a natural gas and optionally with an oxidant.

Embodiments of the disclosure include systems and processes for the recovery of sulfur dioxide (SO.sub.2) from tail gas of sulfur recovery plant or from flue gas of a power plant, such as flue gas originating from an H.sub.2S-containing fuel gas for a gas turbine. SO.sub.2-containing gas is dissolved in chilled water and produce SO.sub.2-containing chilled water. The SO.sub.2-containing chilled is contacted with H.sub.2S-containing gas to aqueously react H.sub.2S and SO.sub.2 and form elemental sulfur. A water stream with the entrained sulfur is routed to a solid-liquid separate, and separated sulfur may be processed or disposed of. The water is recycled and chilled for use in the reaction. Embodiments also include the generation of sulfur dioxide (SO.sub.2) from produced sulfur instead of using tail gas or flue gas.

One aspect of the invention relates to a method comprising a single-stage conversion of an atmospheric pollutant, such as NO, NO.sub.2 and/or SO.sub.x in a first stream to one or more mineral acids and/or salts thereof by reacting with nonionic gas phase chlorine dioxide (ClO.sub.2.sup.0), wherein the reaction is carried out in the gas phase. Another aspect of the invention relates to a method comprising first adjusting the atmospheric pollutant concentrations in a first stream to a molar ratio of about 1:1, and then reacting with an aqueous metal hydroxide solution (MOH). Another aspect of the invention relates to an apparatus that can be used to carry out the methods disclosed herein. The methods disclosed herein are unexpectedly efficient and cost effective, and can be applied to a stream comprising high concentration and large volume of atmospheric pollutants.