An adsorption-desorption material, in particular, crosslinked organo-amine polymeric materials having a weight average molecular weight of from about 500 to about 110.sup.6, a total pore volume of from about 0.2 cubic centimeters per gram (cc/g) to about 2.0 cc/g, and an adsorption capacity of at least about 0.2 millimoles of CO.sub.2 adsorbed per gram of adsorption-desorption material, and linear organo-amine polymeric materials having a weight average molecular weight of from about 160 to about 110.sup.6, a total pore volume of from about 0.2 cubic centimeters per gram (cc/g) to about 2.0 cc/g, and an adsorption capacity of at least about 0.2 millimoles of CO.sub.2 adsorbed per gram of adsorption-desorption material. This disclosure also relates in part to processes for preparing the crosslinked organo-amine materials and linear organo-amine materials. This disclosure further relates in part to the selective removal of CO.sub.2 and/or other acid gases from a gaseous stream containing one or more of these gases using the adsorption-desorption materials.

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.

A vapor separator in an embodiment is arranged between a first space and a second space, and is used to allow vapor existing in the first space to permeate the second space by making a vapor pressure in the second space lower than a vapor pressure in the first space. The vapor separator in the embodiment includes: a porous body having a first face, a second face opposite to the first face, and fine pores passing from the first face to the second face; and a soluble absorbent existing in the fine pores of the porous body.

In one aspect, the invention provides a method for the capture of at least one acid gas in a composition, the release of said gas from said composition, and the subsequent regeneration of said composition for re-use, said method comprising performing, in order, the steps of: (a) capturing the at least one acid gas by contacting said at least one gas with a capture composition comprising at least one salt of a carboxylic acid and at least one water-miscible non-aqueous solvent; (b) releasing said at least one acid gas by adding at least one protic solvent or agent to said composition; and (c) regenerating the capture composition by partial or complete removal of said added protic solvent or agent from said composition. Optionally, said capture composition comprising at least one salt of a carboxylic acid and at least one water-miscible non-aqueous solvent additionally comprises water or another protic solvent. In another aspect, the invention envisages a composition which additionally comprises at least one protic solvent or agent and release of the at least one acid gas is achieved solely by subjecting the composition to the application of heat or stripping with a stream of air. The method is typically applied to the capture and subsequent release of carbon dioxide, and offers a convenient and simple process which uses inexpensive consumables and offers significant advantages over the methods of the prior art.

An adsorption-desorption material, in particular, crosslinked organo-amine polymeric materials having a weight average molecular weight of from about 500 to about 110.sup.6, a total pore volume of from about 0.2 cubic centimeters per gram (cc/g) to about 2.0 cc/g, and an adsorption capacity of at least about 0.2 millimoles of CO.sub.2 adsorbed per gram of adsorption-desorption material, and linear organo-amine polymeric materials having a weight average molecular weight of from about 160 to about 110.sup.6, a total pore volume of from about 0.2 cubic centimeters per gram (cc/g) to about 2.0 cc/g, and an adsorption capacity of at least about 0.2 millimoles of CO.sub.2 adsorbed per gram of adsorption-desorption material. This disclosure also relates in part to processes for preparing the crosslinked organo-amine materials and linear organo-amine materials. This disclosure further relates in part to the selective removal of CO.sub.2 and/or other acid gases from a gaseous stream containing one or more of these gases using the adsorption-desorption materials.

An adsorption-desorption material, in particular, crosslinked organo-amine polymeric materials having a weight average molecular weight of from about 500 to about 110.sup.6, a total pore volume of from about 0.2 cubic centimeters per gram (cc/g) to about 2.0 cc/g, and an adsorption capacity of at least about 0.2 millimoles of CO.sub.2 adsorbed per gram of adsorption-desorption material, and linear organo-amine polymeric materials having a weight average molecular weight of from about 160 to about 110.sup.6, a total pore volume of from about 0.2 cubic centimeters per gram (cc/g) to about 2.0 cc/g, and an adsorption capacity of at least about 0.2 millimoles of CO.sub.2 adsorbed per gram of adsorption-desorption material. This disclosure also relates in part to processes for preparing the crosslinked organo-amine materials and linear organo-amine materials. This disclosure further relates in part to the selective removal of CO.sub.2 and/or other acid gases from a gaseous stream containing one or more of these gases using the adsorption-desorption materials.

In a general aspect, a carbon dioxide removal system is presented. In some cases, a gas-liquid contactor is wetted with an alkaline capture solution. A first flow from a first gaseous feed including CO.sub.2 from a first source is directed to interact with the alkaline capture solution in the gas-liquid contactor, which forms a first CO.sub.2-rich alkaline capture solution. A second flow from a second gaseous feed including CO.sub.2 from a second, distinct source is directed to interact with the first CO.sub.2-rich alkaline capture solution, which forms a second CO.sub.2-rich alkaline capture solution. In some cases, the second flow is independent of the first gaseous feed, and a concentration of CO.sub.2 in the second CO.sub.2-rich alkaline capture solution is higher than a concentration of CO.sub.2 in the first CO.sub.2-rich alkaline capture solution. CO.sub.2 can be separated from the second CO.sub.2-rich alkaline capture solution.

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.

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.