Abstract: The present application is directed to processes for removing carbon dioxide (CO2) from low CO2 concentration gaseous streams. The process comprises contacting the gaseous stream with a hydrogel for absorbing at least some CO2 from the gaseous stream. The hydrogel comprises a cross-linked hydrophilic polymer comprising a hydrophilic polymer cross-linked with a cross-linking agent. Processes for preparing the hydrogel, types of hydrogels, using the hydrogel to remove CO2 from gaseous streams, and regenerating the hydrogel to recover absorbed CO2 from the hydrogel are also disclosed.

Abstract: The present disclosure is directed to an acidic gas absorbent particulate for capture of an acidic gas from a gaseous stream or atmosphere, the acidic gas absorbent particulate comprising swellable support particles, wherein the swellable support particles contain absorbed amine-functionalised ionic liquid for absorbing the acidic gas, and to apparatuses, processes, methods and uses comprising the same.

Abstract: The present disclosure generally relates to thermally conductive hydrogels. In particular, the present disclosure relates to thermally conductive hydrogels comprising one or more acidic gas absorbents, which can be used to capture one or more acidic gases from gaseous streams or atmospheres. The present disclosure also relates to processes, methods, systems, uses and apparatuses comprising the thermally conductive hydrogels for capturing acidic gases from a gaseous stream or atmosphere.

Abstract: The present disclosure is to functionalised polyamine hydrogels that can be used for capturing one or more acidic gases from gaseous streams and atmospheres. In particular, the present disclosure is directed to hydrogels comprising a cross-linked polyamine or copolymer thereof, wherein the cross-linked polyamine comprises one or more amine groups substituted with an optionally substituted alkanol group. Methods and apparatuses for removing acidic gases from gaseous streams or atmospheres using the functionalised hydrogels are also disclosed.

Abstract: A composition for capture of acid gas comprising solid porous particles of hypercrosslinked polymer comprising a network of aryl groups linked by methylene (—CH2—) bridging groups formed by Friedel-Crafts catalyzed polymerization or Friedel-Crafts catalyzed post-polymerization cross-linking; wherein the solid porous particles of hypercrosslinked polymer contain absorbed liquid comprising an acid gas absorbent selected from chemical absorbent for acid gas, physical absorbent for acid gas or mixture thereof and the weight ratio of absorbed liquid to solid porous particles of hypercrosslinked polymer is from 1:1 to 5:1.

Abstract: The present application is directed to processes for removing carbon dioxide (CO2) from low CO2 concentration gaseous streams. The process comprises contacting the gaseous stream with a hydrogel for absorbing at least some CO2 from the gaseous stream. The hydrogel comprises a cross-linked hydrophilic polymer comprising a hydrophilic polymer cross-linked with a cross-linking agent. Processes for preparing the hydrogel, types of hydrogels, using the hydrogel to remove CO2 from gaseous streams, and regenerating the hydrogel to recover absorbed CO2 from the hydrogel are also disclosed.