- Title
- Postcombustion capture of CO₂ by diamines containing one primary and one tertiary amino group: reaction rate and mechanism
- Creator
- Yu, Bing; Yu, Hai; Yang, Qi; Li, Kangkang; Ji, Long; Zhang, Rui; Megharaj, Mallavarapu; Chen, Zuliang
- Relation
- Energy & Fuels Vol. 33, Issue 8, p. 7500-7508
- Publisher Link
- http://dx.doi.org/10.1021/acs.energyfuels.9b00961
- Publisher
- American Chemical Society
- Resource Type
- journal article
- Date
- 2019
- Description
- Developing ideal amine solvents with a high CO₂ absorption capacity and a fast absorption rate is an attractive avenue to advance the amine scrubbing technology. In this regard, diamines bearing one primary and one tertiary amino group (1°/3° diamines) are proposed to be promising solvents for CO₂ absorption, which can exhibit the fast CO₂ absorption rate of primary amines while maintaining the diamines’ intrinsic high absorption capacity. Here, we present a detailed kinetic study of four 1°/3° diamines for CO₂ absorption and investigate the relationship between the structure of various 1°/3° diamines and their CO₂ absorption rate. Results showed that increasing alkyl spacer between two amino groups within 1°/3° diamines promoted the CO₂ absorption rate, while a large decrease in their reactivity with CO₂ was observed when the tertiary amino group existed in the cyclic structure. Among these studied 1°/3° diamines, 3-(dimethylamino)-1-propylamine (DMAPA) displayed the highest absorption rate under relevant conditions and also exhibited higher overall mass transfer coefficients than those of monoethanolamine over the entire range of CO₂ loadings, and the main reaction routes for CO₂ absorption into DMAPA solution via formation of the protonated DMAPA-carbamate were proposed.
- Subject
- reaction mechanisms; amines; absorption; mass transfer; molecules; SDG 13; Sustainable Development Goals
- Identifier
- http://hdl.handle.net/1959.13/1445605
- Identifier
- uon:42625
- Identifier
- ISSN:0887-0624
- Language
- eng
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