Abstract: The proposed techniques relate to removing heat stable amine salts (HSAS) from a contaminated aqueous amine absorption solution containing amine in salt form generated during an amine-based acid gas recovery operation, while reducing or avoiding discharging any liquid waste. At least a portion of the HSAS is removed from the contaminated aqueous amine absorption solution in an amine reclamation unit to produce a waste stream containing dissolved salts and/or acids, and a regenerated amine absorption solution containing a reduced amount of the heat stable amine salts. The waste stream is further treated by oxidizing the waste stream into an oxidized product stream comprising CO2, water, and nitrogen. Optionally, the concentration in dissolved salts and/or acids of the waste stream can be increased prior to oxidation. The oxidation can advantageously be operated in a combustion unit that produces a flue gas directed to acid gas recovery as part of an integrated process.

Abstract: The proposed techniques relate to removing heat stable amine salts (HISAS) from a contaminated aqueous amine absorption solution containing amine in salt form generated during an amine-based acid gas recovery operation, while reducing or avoiding discharging any liquid waste. At least a portion of the HSAS is removed from the contaminated aqueous amine absorption solution in an amine reclamation unit to produce a waste stream containing dissolved salts and/or acids, and a regenerated amine absorption solution containing a reduced amount of the heat stable amine salts. The waste stream is further treated by oxidizing the waste stream into an oxidized product stream comprising CO2, water, and nitrogen. Optionally, the concentration in dissolved salts and/or acids of the waste stream can be increased prior to oxidation. The oxidation can advantageously be operated in a combustion unit that produces a flue gas directed to acid gas recovery as part of an integrated process.

Abstract: Processes for removing heat stable amine salts from a contaminated aqueous amine solution are proposed comprising passing a feedstream of the contaminated aqueous amine solution in an electrodialysis zone comprising at least one repeat unit with an amine solution compartment for receiving the feedstream, a waste compartment, and an anion source compartment receiving an anion source stream or a bi-polar membrane disposed for providing anions balancing the heat stable anions. Monitoring of an anion source-related parameter being correlated to the anion source concentration of the anion-depleted source stream, or of a waste parameter being correlated to an acid concentration of the waste stream, is performed to further adjust an addition of the anion source or a removal of the waste stream in accordance with the monitored parameter.

Abstract: The proposed techniques relate to removing heat stable amine salts (HSAS) from a contaminated aqueous amine absorption solution containing amine in salt form generated during an amine-based acid gas recovery operation, while reducing or avoiding discharging any liquid waste. At least a portion of the HSAS is removed from the contaminated aqueous amine absorption solution in an amine reclamation unit to produce a waste stream containing dissolved salts and/or acids, and a regenerated amine absorption solution containing a reduced amount of the heat stable amine salts. The waste stream is further treated by oxidizing the waste stream into an oxidized product stream comprising CO2, water, and nitrogen. Optionally, the concentration in dissolved salts and/or acids of the waste stream can be increased prior to oxidation. The oxidation can advantageously be operated in a combustion unit that produces a flue gas directed to acid gas recovery as part of an integrated process.