Impacts of film forming amines and alkalizing amines on the exchange capacity and mass transfer coefficient of ion exchange resins
| dc.contributor.advisor | Cook, William | |
| dc.contributor.author | Kongtuk, Jirapinya | |
| dc.date.accessioned | 2024-10-17T18:40:45Z | |
| dc.date.available | 2024-10-17T18:40:45Z | |
| dc.date.issued | 2024-08 | |
| dc.description.abstract | In a power plant, condensate polishers containing ion-exchange resins are used to maintain water quality by removing ions and some particulate impurities from the condensate. Film-forming amines (FFA) and alkalizing amines are added to the water system for corrosion protection and pH adjustment and can also be removed by the ion-exchange resins of the condensate polishers. This may have significant impacts on the ion-exchange resins and secondary heat transport system in a power plant. The impacts of a FFA (octadecylamine-ODA) and an alkalizing amine (cyclohexylamine-CHA) on ion-exchange capacity and ion-exchange resins physical properties were investigated with representative strong cation-exchange (HPR 1300(H)-gel type) and strong anion-exchange resins (Ambersep 900(OH)-macroporous type). The ion-exchange capacity of the cation-exchange resin dropped dramatically after exposure to ODA, while the anion-exchange resin experienced only a slight drop in ion-exchange capacity as a result of adsorption. CHA exposure did not have a major impact on either ion-exchange resin as the regeneration process was capable of successfully replenishing the ion-exchange resins. The impacts of ODA on the mass transfer coefficient (MTC) of ion-exchange resins were also investigated. It was found that a low concentration of ODA did not have a significant impact on the MTC of both type of resins. However, MTC depended significantly on the temperature of the feed solution. The regeneration process was unsuccessful in improving MTC to the original level after the ion-exchange resins were used. The results predicted that ODA coating on the surface of resins could not be removed by general acid and alkaline solution. The degradation/breakdown products of ODA in simulated CANDU secondary feedwater chemistry conditions were also studied. The results indicated that black/brown residue was found to be a main breakdown product of ODA as a consequence of thermal degradation. The cation and anion breakdown product (ammonia, amines, acetate, formate, etc.) and their concentrations depend on the boiler water temperatures and chemistry conditions. | |
| dc.description.copyright | ©Jirapinya Kongtuk, 2024 | |
| dc.format.extent | xxvi, 198 | |
| dc.format.medium | electronic | |
| dc.identifier.uri | https://unbscholar.lib.unb.ca/handle/1882/38166 | |
| dc.language.iso | en | |
| dc.publisher | University of New Brunswick | |
| dc.relation | Natural Sciences and Engineering Research Council of Canada (NSERC) | |
| dc.relation | University Network of Excellence in Nuclear Engineering (UNENE) | |
| dc.rights | http://purl.org/coar/access_right/c_abf2 | |
| dc.subject.discipline | Chemical Engineering | |
| dc.title | Impacts of film forming amines and alkalizing amines on the exchange capacity and mass transfer coefficient of ion exchange resins | |
| dc.type | doctoral thesis | |
| oaire.license.condition | other | |
| thesis.degree.discipline | Chemical Engineering | |
| thesis.degree.grantor | University of New Brunswick | |
| thesis.degree.level | doctorate | |
| thesis.degree.name | Ph.D. |