CO2 absorption into aqueous ammonia using membrane contactors: Role of solvent chemistry and pore size on solids formation for low energy solvent regeneration
نویسندگان
چکیده
Solids formation can substanitally reduce the energy penalty for ammonia solvent regeneration in carbon capture and storage (CCS), but has been demonstrated literature to be difficult control. This study examines use of hollow fibre membrane contactors, as this indirect contact mediated between liquid gas phases geometry could improve regulation solids formation. Under conditions comparable existing literature, NH4HCO3 was evidenced primarily crystallise gas-phase (lumen-side membrane) due high vapour pressure ammonia, which promotes gaseous transmission from solvent. Investigation reactivity how equilibria dependent reactions controlled onset nucleation solvent, limited ‘slip’ through transfomation into its protonated form occurs prior phase change. Crystallisation also upon concentration, where sufficient supersaturation must develop overcome activation nucleation. However, complemented with a reduction temperature offset limit risk crystallisation. While changes chemistry were shift crystallisation, wetting observed immediately after explained by local region within coarse pores that promoted rate, altering material angle breakthrough phase. Adoption narrower pore size shown dissipate crystallisation illustrating contactors stable platform sustained separation CO2 coupled simultaneous transformation solid. Through resolving previous challenges experienced multiple reactor configurations, cost benefit using realised, is critical enabling economically viable CCS transition net zero, exploited eliciting considerable process intensification over designs CCS.
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ژورنال
عنوان ژورنال: Separation and Purification Technology
سال: 2022
ISSN: ['1873-3794', '1383-5866']
DOI: https://doi.org/10.1016/j.seppur.2022.120786