In this work, the chemical and thermal stability of a primary amine-functionalized ion-exchange resin (Lewatit VP OC 1065) is studied in view of the potential options of regenerating this sorbent in a CO2 removal application. The adsorbent was treated continuously in the presence of air, different O2/CO2/N2 mixtures, concentrated CO2, and steam, and then the remaining CO2 adsorption capacity was measured. Elemental analysis, BET/BJH analysis, Fourier transform infrared spectroscopy, and thermogravimetric analysis were applied to characterize adsorbent properties. This material was found to be thermally and hydrothermally stable at high temperatures. However, significant oxidative degradation occurred already at moderate temperatures (above 70 °C). Temperatures above 120 °C lead to degradation in concentrated dry CO2. Adding moisture to the concentrated CO2 stream improves the CO2-induced stability. Adsorbent regeneration with nitrogen stripping is studied with various parameters, focusing on minimizing the moles of purge gas required per mole of CO2 desorbed.

The version presented here may differ from the published version. If citing, you are advised to consult the published version for pagination, volume/issue and date of publication NMR techniques and prediction models for the analysis of the species formed in CO2 capture processes with aminebased sorbents: a critical review

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Benzylamine (BZA), biodegradable with bacteria, has advantages over monoethanolamine (MEA) in terms of corrosiveness, resistance to oxidative degradation, viscosity, mass transfer, and energy consumption for CO 2 capture. The current work examined the CO 2 absorption−desorption performances of three BZA-based solvents to improve the amine scrubbing process with significant reduction of the energy consumption especially during the solvent regeneration. The experimental results approved that BZA−1DMA2P reduces the energy cost, increases the cyclic capacity, and increases the CO 2 desorption rate by 55.3, 478.8, and 189.2% compared to MEA, respectively. Based on the discoveries from the designed experiments, an evaluation parameter of energy-operation-window was proposed to quantitatively describe the flexibility and capability of CO 2 extraction from a CO 2 -rich solution with a certain amount of energy. A combined desorption parameter (DP) was also developed to evaluate the energy performance of an amine solvent. The universal applicability of DP was validated with a series of data extracted from literature studies with different amine systems with and without catalysts. All these results confirmed that DP could be an efficient parameter to predict the energy efficiency of a solvent for a fast screening process without directly measuring the heat cost.

Degradation and recycling of cured thermosetting epoxy resins are major challenges to the industry. Here, a low-viscosity, degradable epoxy-ended hyperbranched polyester (DEHP) is synthesized by a reaction between epichlorohydrin and a carboxyl-ended hyperbranched polyester (DCHP) obtained from an esterification between citric acid and maleic anhydride. The chemical structures of DCHP and DEHP were characterized by Fourier transform infrared and 1 H NMR. DEHP has a positive effect on reinforcing and toughening of the diglycidyl ether of bisphenol-A (DGEBA). With an increase in the content and molecular weight of DEHP, the mechanical performances of the cured DEHP/DGEBA composites, including the tensile, flexural, and impact strengths, increase first and then decrease. The improvements on the tensile, flexural, and impact strengths were 34.2–43.4%, 35.6–48.1%, and 117.9–137.8%, respectively. Moreover, the DEHP also promotes degradation of the cured DEHP/DGEBA composites. The degree of degradation of the cured DEHP/DGEBA composites increases with an increase of the DEHP content and molecular weight. The composites containing 12 wt % DEHP can be degraded completely in only about 2 h at about 90 °C, compared with the degradation degree (35%) of cured DGEBA, indicating good degradation and recycling properties of the DEHP.