Provided are a hydrogen recycle system and a hydrogen recycle method, whereby hydrogen can be purified to high purity at high yield from a gas, said gas being exhausted from a nitride compound production device, and recycled. The hydrogen recycle system comprises an exhaust gas supply path supplying a gas exhausted from a nitride compound production device, a hydrogen recycle means and a hydrogen supply path. The hydrogen recycle means of the hydrogen recycle system is characterized by comprising: a plasma reaction vessel that defines at least a part of a discharge space; a hydrogen separation membrane that divides the discharge space from a hydrogen flow path communicated with the hydrogen supply path, defines at least a part of the discharge space by one surface thereof and also defines at least a part of the hydrogen flow path by the other surface thereof; an electrode that is disposed outside the discharge space; and an adsorbent that is filled in the discharge space and adsorbs the supplied exhaust gas.

Provided are a hydrogen recycle system and a hydrogen recycle method, whereby hydrogen can be purified to high purity at high yield from a gas, said gas being exhausted from a nitride compound production device, and recycled. The hydrogen recycle system 1 comprises an exhaust gas supply path 11 supplying a gas exhausted from a nitride compound production device 2, a hydrogen recycle means 10 and a hydrogen supply path 12. The hydrogen recycle means 10 of the hydrogen recycle system 1 is characterized by comprising: a plasma reaction vessel 31 that defines at least a part of a discharge space 32; a hydrogen separation membrane 34 that divides the discharge space 32 from a hydrogen flow path 33 communicated with the hydrogen supply path 12, defines at least a part of the discharge space 32 by one surface thereof and also defines at least a part of the hydrogen flow path 33 by the other surface thereof; an electrode 35 that is disposed outside the discharge space 32; and an adsorbent 36 that is filled in the discharge space 32 and adsorbs the supplied exhaust gas.

A sulfur removal system including a first reactor and a second reactor that are located in series to one another each having an adsorbent that includes cobalt and copper on an activated carbon support, a method of desulfurizing a sulfur-containing hydrocarbon stream via the sulfur removal system, and a method of making the adsorbent. Various embodiments of the sulfur removal system, the desulfurizing method, and the method of making the adsorbent is also provided.

A sulfur removal system including a first reactor and a second reactor that are located in series to one another each having an adsorbent that includes cobalt and copper on an activated carbon support, a method of desulfurizing a sulfur-containing hydrocarbon stream via the sulfur removal system, and a method of making the adsorbent. Various embodiments of the sulfur removal system, the desulfurizing method, and the method of making the adsorbent is also provided.

A mineral polymer for reducing pollutants, in particular for gas absorbing, absorbing pollutant volatile organic compounds such as volatile organic hydrocarbons and/or capturing particulate pollutants. The mineral polymer may be a metakaolin-based mineral polymer with a porous or non-porous structure. The use of the mineral polymer for reducing pollutants includes for absorbing one or more pollutant gases, such as NOx (such as NO.sub.2), SOx (such as SO.sub.2) and/or CO.sub.2, for absorbing pollutant volatile organic compounds such as volatile organic hydrocarbons and/or for capturing particulate pollutants, such as those produced by diesel engines. The pollutants are removed directly from the engine exhaust, from a ventilation system, or at the road side. A method for reducing pollutants comprises the steps: (i) providing the mineral polymer; (ii) exposing said mineral polymer to one or more pollutants; and optionally, (iii) regenerating the capability of the mineral polymer to reduce pollutants. Regeneration may be carried out by washing with a solvent, or heating. The solvent may be water or another suitable solvent.

A system for reclaiming water from moisture-laden building exhaust exiting a building through a vent is described herein, where the system can include one or more porous metal organic frameworks (MOFs) disposed downstream of the building exhaust vent for adsorbing water from the exiting moisture-laden building exhaust. The adsorped water can be desorped from the MOF, either naturally or aided by cooling the MOF. The desorped water can optionally be collected or directed elsewhere for use or collection.

A sulfur removal system including a first reactor and a second reactor that are located in series to one another each having an adsorbent that includes cobalt and copper on an activated carbon support, a method of desulfurizing a sulfur-containing hydrocarbon stream via the sulfur removal system, and a method of making the adsorbent. Various embodiments of the sulfur removal system, the desulfurizing method, and the method of making the adsorbent is also provided.

The present disclosure provides processes and systems for heat integration in ethanol production. In one embodiment, a feed mixture is distilled with one or more distillation units to remove at least a portion of the water, and form a distillation unit bottom stream, a vaporous overhead stream, and a fusel oil stream. Molecular sieve units are regenerated by vacuum or a combination of vacuum and optionally a portion of the product stream to form one or more regenerate streams. A feed tank is configured to receive at least one selected from a condensed portion of the regenerate streams and a portion of a vaporous depressure stream, to form a feed stream. The energy contained in the depressure vapor is recovered by the depressure vapor contacting the feed tank and heating up at least one stream forwarded into the feed tank.

A liquid/gas contactor unit includes a unit housing having a liquid inlet and a liquid outlet, and an air inlet and an air outlet. The liquid inlet and the liquid outlet are configured to flow liquid through the unit housing in a gravity liquid flow direction. The air inlet and the air outlet are configured to flow air through the unit housing in an air flow direction. A plurality of porous media layers are contained within the unit housing and along the air flow channel. Each porous media layer is separated from an adjacent porous media layer by an air gap. Each porous media layer has opposing major surfaces separated by a thickness. The opposing major surfaces are orthogonal to the gravity liquid flow direction.

An atmospheric CO.sub.2 capture system includes a compartment housing a solid CO.sub.2 sorbent, an exchange fluid including a chemical component with selectivity towards CO.sub.2, and an electrochemical cell in fluid communication with the compartment, the system having a cycle including a first state of sorbing CO.sub.2 from incoming air onto the solid CO.sub.2 sorbent until a saturation point is reached; a second state of regenerating the sorbent by flooding the compartment with the exchange fluid to detach CO.sub.2 from the saturated sorbent and bind the detached CO.sub.2 to the chemical component; and a third state of regenerating the chemical component by detaching CO.sub.2 from the chemical component in the electrochemical cell and releasing the CO.sub.2 from the system.