Presented is a chemical formaldehyde filter comprising a filter substrate having a porous structure; the filter substrate comprising a mixture of a formaldehyde absorbent and a porous framework material. Further, a method for fabricating such a filter is described.

An absorbent for desulfurization of combustion gas is provided. The absorbent includes about 1 to about 16 wt % of potassium carbonate (K.sub.2CO.sub.3); about 0.1 to about 10 wt % of a promoting agent including hindered cyclic amine, hindered cyclic amine bicarbonate, or a combination thereof; and a balance amount of water. In addition, a method of treating the combustion gas using the absorbent is provided.

A humidity control device for use in maintaining the desired humidity of a closed environment, e.g., a container, while also decreasing headspace oxygen, the device including a water vapor and oxygen permeable pouch, an aqueous salt solution containing humidity controlling salts in combination with salts of ascorbic acid or isomers thereof.

Disclosed is a process for deacidising a non-aqueous feed comprising one of H.sub.2S, CO.sub.2, COS, CS.sub.2, disulphides and/or mercaptans, comprising a. an absorption step contacting the feed in countercurrent with an aqueous absorbent solution, forming a product reduced in the acid compounds and a liquid absorbent solution enriched with acid compounds, b. a regeneration step treating the enriched solution from step a) to release acid compound, thereby forming a lean absorbent solution and a stream containing the acid compound, and c. recycling at least part of the lean solution from step b) to step a),
characterised in that step a) is performed at a pressure of at least 5.0 bar gauge, and the absorbent solution comprises an absorbent selected from N,N,N-trimethyl-N-(hydroxyethyl)-1,3-propanediamine, N-(3-aminopropyl)-N-(dimethyl-amino)propyl-N,N-dimethyl-1,3-propanediamine, and a mixture of methyl diethanol amine with tris(N,N,-dimethylamino propyl)amine in a weight ratio in the range of 25:75 to 95:5, and mixtures thereof.

A humidity control device for use in maintaining the desired humidity of a closed environment, e.g., a container, while also decreasing headspace oxygen, the device including a water vapor and oxygen permeable pouch, an aqueous salt solution containing humidity controlling salts in combination with salts of ascorbic acid or isomers thereof.

Hydrogen sulfide and mercaptans may be removed from a fluid or gaseous stream by introducing a composite to the fluid or gaseous stream containing a hydrogen sulfide scavenger adsorbed onto a water-insoluble adsorbent.

The description relates to reducing hydrochloric acid in cement kilns. In one aspect, an aqueous copper-based chloride remediator is introduced into contact with combustion gases from a cement kiln. Injection is made into a defined introduction zone under conditions effective for HCl emissions control wherein the temperature is within the range of from 300 F. to 800 F., preferably from 550 F. to 750 F. The resulting gases are discharged from the defined zone following sufficient reaction time to reduce the HCl concentration in the gases.

The present invention relates to an apparatus for absorbing and mineralizing carbon dioxide comprising a reactor and a three-phase separator, in which said reactor comprises a tower body and a draft tube disposed inside the tower body, a liquid inlet pipe and a gas intake pipe being disposed on the tower body, the outlet ends of the liquid inlet pipe and the gas intake pipe both being located inside the draft tube; and the three-phase separator is disposed at the upper end of the reactor, and a method therefor. The arrangement of draft tube inside the reactor of the present invention, enhances gas-liquid-solid mixing state because of the flow with airlift loop flow inside the reactor, accelerates the dissolution rate of solid alkali solute and thus may increase absorption reaction rate and absorptivity; the integration of three-phase separator in the reaction apparatus may isolate carbonate by settling while reacting, reduce solid content of the solution, while reducing the circulation of water between absorption and separation units, improve process performance, reduce process energy consumption; carbonate particles generated can be controlled better, thus a higher settling efficiency can be obtained.

In a general aspect, interfacial surface structures for removing carbon dioxide from a gaseous feed are presented. In some cases, a method of removing carbon dioxide gas from a gaseous feed includes wetting surfaces of an interfacial surface structure in a gas-liquid contactor with an alkaline capture solution. The gaseous feed containing the CO.sub.2 gas is passed across the wetted surfaces of the interfacial surface structure to dissolve the CO.sub.2 gas in the alkaline capture solution. A CO.sub.2-rich alkaline capture solution is collected from the gas-liquid contactor. The CO.sub.2-rich alkaline capture solution includes dissolved CO.sub.2 gas from the gaseous feed.

Hydrogen sulfide and mercaptans may be removed from a fluid or gaseous stream by introducing a composite to the fluid or gaseous stream containing a hydrogen sulfide scavenger adsorbed onto a water-insoluble adsorbent.