Biogas Upgrading by Capturing CO2 in Non-aqueous Phase-Changing Diamine Solutions

Mengna Tao, Jinzhe Gao, Pei Zhang, Wei Zhang, Qing Liu, Yi He, Yao Shi

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Ethanol solutions of diamine, ethylenediamine (EDA) or piperazine (PZ), were found to be able to produce a solid precipitate after the absorption of CO2. The precipitate was identified to be a mixture of monocarbamate and dicarbamate. The details of the reactions between CO2 and diamine were examined. Results show that EDA-ethanol solutions exhibit higher capacity and faster rate for CO2 absorption than PZ-ethanol solutions. As a comparison, the kinetics of CO2 absorption with diamine-water solutions were also tested. It was found that the overall average absorption rate of CO2 in EDA-ethanol solutions is almost double that in EDA-water solutions. Moreover, results show that EDA-carbamate has a decomposition temperature of ∼90°C and requires a regeneration energy of 25.6% less than traditional monoethanolamine (MEA) solutions, which suggests that EDA-ethanol solutions are promising to be used as cost-effective absorbents for CO2 capture.

Original languageEnglish
Pages (from-to)6298-6304
Number of pages7
JournalEnergy and Fuels
Volume31
Issue number6
DOIs
StatePublished - 15 Jun 2017
Externally publishedYes

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