SO₂-Resistant Immobilized Amine Sorbents for CO₂ Capture

Technical Report · Wed Jan 01 00:00:00 EST 2014

DOI:https://doi.org/10.2172/1222646· OSTI ID:1222646

Tumuluri, Uma ^[1]

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1. Univ. of Akron, OH (United States)

The solid amine sorbent for CO₂ capture process has advantages of simplicity and low operating cost compared to the MEA (monoethanolamine) process. Solid amine sorbents reported so far suffered from either low CO₂ capture capacity or low stability in the flue gas environment. This project is aimed at developing a SO₂-resistant solid amine sorbent for capturing CO₂ from coal–fired power plants with SCR/FGD which emits SO₂ranging from 15 to 30 ppm and NO ranging from 5 to 10 ppm. The amine sorbent we developed in a previous project degraded rapidly with 65% decrease in the initial capture capacity in presence of 1% SO₂. This amine sorbent was further modified by coating with polyethyleneglycol (PEG) to increase the SO₂-resistance. Polyethylene glycol (PEG) was found to decrease the SO₂-amine interaction, resulting in the decrease in the maximum SO desorption temperature (Tmax ) of amine sorbent. The PEG-coated amine sorbent exhibited higher stability with only 40% decrease in the initial capture capacity compared to un-coated amine sorbents. The cost of the solid amine sorbent developed in this project is estimated to be less than $7.00/lb; the sorbent exhibited CO₂ capture capacity more than 2.3 mmol/g. The results of this study provided the scientific basis for further development of SO₂-resistant sorbents.

• Research Organization: Univ. of Akron, OH (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: FE0001780
• OSTI ID: 1222646
• Country of Publication: United States
• Language: English