Abstract: Processes for recovery of carbon dioxide from a gas stream are described. The processes reduce dehydration cost in CO2 capture systems and minimize the formation of COS and H2O and enable water removal with an enhanced solvent-based absorbent operating at a lower temperature. This allows low residual water levels to be achieved in the dried gas. Also, feed streams containing high levels of CO2 and H2S can be treated in an integrated system comprising a cryogenic CO2 fractionation system, an overhead pressure swing adsorption (PSA) unit, and a CO2 temperature swing adsorption (TSA) unit. The processes allow recovery of helium and methane as well as CO2 and H2S.

Abstract: Processes and apparatuses for removing contaminants from a carbon dioxide stream by passing a concentrated carbon dioxide stream to a treating zone and removing one or more contaminants from the concentrated carbon dioxide stream and provide a treated concentrated carbon dioxide stream, the one or more contaminants selected from a group consisting of: sulfur compounds, heavy hydrocarbons, water, and mixtures thereof, the treating zone comprising at least one vessel containing a solid adsorbent or configured to receive a stream of solvent.

Abstract: A method of removing per- and polyfluoroalkyl substances (PFAS) from water includes adding a polymer coacervate adsorbent including oppositely charged polyelectrolytes to contaminated water. The two oppositely charged polyelectrolytes are biocompatible. An adsorbent for removal of per- and polyfluoroalkyl substances (PFAS) from contaminated water includes oppositely charged polyelectrolytes. The polyelectrolytes include polyacrylic acid (PAA) and/or polyethylene oxide (PEO) according to an example.

Abstract: A process for treating a gas stream, such as natural gas, comprising a process design that prevents the formation of undesired sulfur and sulfates from the reaction of oxygen and sulfur is disclosed. After water is removed from the gas stream, a portion of the dried gas stream is sent through a cooled adsorbent bed that has a first layer to remove sulfur compounds and then a layer to remove oxygen. There may be additional layers of adsorbent to remove other contaminants. The gas stream that is then heated to regenerate an adsorbent bed no longer contains sulfur and oxygen and undesirable reactions of sulfur and oxygen are avoided.

Abstract: A process for treating a gas stream, such as natural gas, comprising a process design that prevents the formation of undesired sulfur and sulfates from the reaction of oxygen and sulfur is disclosed. After water is removed from the gas stream, a portion of the dried gas stream is sent through a cooled adsorbent bed that has a first layer to remove sulfur compounds and then a layer to remove oxygen. There may be additional layers of adsorbent to remove other contaminants. The gas stream that is then heated to regenerate an adsorbent bed no longer contains sulfur and oxygen and undesirable reactions of sulfur and oxygen are avoided.