A system and process for the capture of carbon dioxide from a gaseous feedstock, regenerating carbon dioxide in a purified form, and regenerating reagents, wherein the reagent regeneration having reduced energy consumption in relation to carbon dioxide capture. Carbon dioxide captured by a slurry scrubbing solution producing a resultant product that can be reacted with an acid reagent to form the regenerated carbon dioxide and a resultant salt solution. Electrodialysis with bipolar membrane separation employed on the resultant salt solution to form regenerated acid and regenerated base. The regenerated base recirculated as the scrubbing solution to capture additional carbon dioxide, and the regenerated acid recirculated for additional acid reaction with additional resultant product, such that the system and process can continuously capture and form regenerated carbon dioxide in a purified form compared to the carbon dioxide of the gaseous feedstock.

Methods and devices for controlling ammonia escape and soluble particulate matter formation in an ammonia-based carbon capture process are provided. After the process gas containing sulfur oxides and carbon dioxide may be treated by ammonia-based desulfurization and carbon capture, free ammonia contained in the tail gas may be removed by scrubbing the tail gas with sulfuric acid-containing solution and aqueous solution. The sulfuric acid reacts with ammonia to form ammonium sulfate, and the ammonium sulfate solution may be sent to an ammonia-based desulfurization system, where it may be crystallized together with the desulfurization byproduct ammonium sulfate to produce solid ammonium sulfate. By treating the ammonium sulfate solution in a membrane separation device, solution gradient control and system water balance may be achieved. The ammonia in the tail gas may be effectively removed, while the soluble particulate matter in the tail gas may be reduced.

Processes and systems for treating Kraft pulping foul condensate are provided. The processes comprise removing volatile compounds from the foul condensate to produce a resulting condensate and removing methanol from the resulting condensate. The systems comprise a volatile compound removal stage and a methanol removal stage downstream of and in fluid communication with the volatile removal stage.

An ethylene oxide (EtO) scrubbing sheet for the removing fugitive EtO emissions from, for example, sterilized medical devices and leaks from chemical plants. The scrubbing sheet comprises an acid impregnated layer, a second layer impregnated with an acid neutralizer, combined inside a gas porous protective membrane. The EtO enters the sheet by diffusion and is removed by irreversible chemical reaction.

Improved systems and methods are disclosed for treating tail gas in a sulfuric acid production plant. A tail gas treatment system is employed which comprises a product stripper and a purge gas scrubber. The inventive arrangement provides an advantageous economical way to remove high levels of SO.sub.2 from the tail gas stream.

Proposed is an apparatus for separating CO2 gas captured with ammonia gas as an absorbent and the ammonia gas from a capture solution. The apparatus includes cation and anion exchange membranes spaced apart from each other to form a capture channel therebetween for a capture solution flow, cathode and anode current collector plates and their corresponding cation and anode exchange membranes forming cathode and anode channels therebetween, respectively. In the separate channels, basic and acidic solutions flow. Power applied to the collector plates drives ammonium and bicarbonate ions from the capture solution through the membranes, and then the ions convert into ammonia and CO2 gases in a chemical reaction, respectively. Through the power application with the basic and acidic solution flows through the corresponding channels, and a flow-conductive acid/base electrolytic separation method, gas separation without directly adding an acidic or basic solution to a capture solution is possible.

A system for removing carbon dioxide from a carbon dioxide-containing gas includes an absorber configured to absorb carbon dioxide from the carbon dioxide-containing gas with a nitrogenous base to form a carbon dioxide-lean gas, an acid wash column configured to remove the nitrogenous base from the carbon dioxide-lean gas with an acid wash solution and form an acid washed solution including the nitrogenous base, and a packed bed including calcium hydroxide configured to deprotonate the nitrogenous base in the acid washed solution. Related systems and methods of removing carbon dioxide from a carbon dioxide-containing gas are also disclosed.

The technology includes a method for removing sulfur dioxide (SO.sub.2) from a gas stream, where SO.sub.2 gas is contacted by a diluted sulfuric acid (H.sub.2SO.sub.4) stream and absorption takes place in a quench tower. The dissolved SO.sub.2 reacts with the excess of oxygen in the gas stream, where the oxidation results in the formation of sulfurous acid (H.sub.2SO.sub.3) and dilute H.sub.2SO.sub.4. For the complete oxidation of the dissolved SO.sub.2, an electrolyzer and/or liquid injectants are used. This results in the formation of diluted H.sub.2SO.sub.4. The diluted H.sub.2SO.sub.4 is processed in an enrichment unit to produce concentrated H.sub.2SO.sub.4 and fresh water. A portion of the diluted H.sub.2SO.sub.4 and/or fresh water is recycled back to the quench tower for the continued acidic absorption of the incoming SO.sub.2 in the gas stream, thereby not relying on an external water source.

A gas scrubber may include an absorption apparatus configured for receiving a gas and absorbing the gas in an absorption medium, as well as an evaporation apparatus configured for evaporating at least a part of the liquid that is introduced. The absorption apparatus may have an introduction apparatus for the gas, an apparatus for circulating the absorption solution that has reacted with the gas, a discharge apparatus for at least a part of the absorption solution that has reacted with the gas, and a cooling system for the circulating absorption solution. The absorption apparatus and the evaporation apparatus can be connected via a heat exchanger such that heat content of the absorption solution that has reacted with the gas is used at least in part for the evaporation.