- Title
- The application of trans-1,4-diaminocyclohexane as a bicarbonate formation rate promoter in CO2 capture
- Creator
- Li, Xiaoqin; Yang, Qi; Pearson, Pauline; Yu, Bing; Puxty, Graeme; Xiao, Dan
- Relation
- Fuel Vol. 226, p. 479-489
- Publisher Link
- http://dx.doi.org/10.1016/j.fuel.2018.04.001
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2018
- Description
- A sterically hindered diamine, trans-1,4-diaminocyclohexane (DACH), is studied as a bicarbonate formation promoter to enhance the CO2 absorption capacity of tertiary amine (N-methyl-N,N-diethanolamine, MDEA). Parallel studies using monoethanolamine (MEA) and 1,4-diaminobutane (DAB) are carried out to assess the influence of amine structure on the CO2 absorption rate. DACH, with cyclic structure, shows the highest initial CO2 absorption rate (1.904 × 10−2 mol CO2/L/min) and initial bicarbonate formation rate out of these three amines. The reasons have been explained in detail. Three mixed amine blends, MEA-MDEA, PZ-MDEA and DACH-MDEA, are also used to observe the advantages of DACH as a bicarbonate formation promoter. The CO2 absorption capacity, CO2 mass transfer coefficients and CO2 equilibrium loading are studied. Although the CO2 absorption rate is in the order of PZ-MDEA > DACH-MDEA > MEA-MDEA, DACH-MDEA blend has a higher concentration of bicarbonate and lower concentration of carbamate compared to PZ-MDEA blend. The highest bicarbonate formation enables DACH-MDEA blend to reduce the regeneration energy. The DACH-MDEA blend also shows the highest CO2 loading (0.576 mol CO2/mol amine) at low CO2 partial pressure. According to the investigation of corrosion behaviours of these three CO2-loaded amine blends, the corrosion rate is PZ-MDEA ≈ DACH-MDEA ≪ MEA-MDEA. All of the results indicate that the DACH diamine with cyclic structure is a promising promoter. This work investigates the effect of amine structural features on the CO2 absorption performance, which provides more knowledge to design efficient amine solvents for CO2 capture.
- Subject
- post combustion CO2 capture; DACH promoter; mixed amine blends; 13C NMR; corrosion; SDG 13; Sustainable Development Goals
- Identifier
- http://hdl.handle.net/1959.13/1441478
- Identifier
- uon:41438
- Identifier
- ISSN:0016-2361
- Language
- eng
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