Pelletization of Immobilized Amine Carbon Dioxide Sorbents with Fly Ash and Poly(vinyl chloride). Issue 5 (27th January 2016)

• Record Type: Journal Article
• Authors: Wilfong, Walter Christopher; Gray, McMahan L.; Kail, Brian W.; Howard, Bret H.
• Is Part Of: Energy technology. Volume 4:Issue 5(2016:May)
• Page Start: 610
• Page End: 619
• Publication Date: 2016-01-27
• Subjects: amines -- carbon dioxide capture -- fly ash -- pelletspoly(vinyl chloride); Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.201500419
• Languages: English
• ISSNs: 2194-4288

Abstract

Abstract: A combination of coal fly ash (FA) and a polymer binder, namely, poly(vinyl chloride) (PVC), was used to pelletize immobilized amine CO2 sorbents. The pelletization of mixtures of FA and 50 wt % tetraethylenepentamine (TEPA) or ethylenimine oligomer mixture ( M w =423)/silica (EI423 ‐S) with PVC created a rigid PVC/FA/sorbent network. The strength of the network was attributed, in part, to the hydrogen bonding of PVC with the hydroxy and amine groups of the FA and sorbent (infrared spectroscopy). Increasing the PVC molecular weight or FA content enhanced the pellet strength and reduced CO2 capture. The optimum pellet, FA/EI423 ‐S (20/80)_PVC62 [10 wt % PVC62 ( M w =62 000), 17 wt % FA], captured 1.33 mmol CO 2 g −1 and exhibited a crush strength of 1.42 MPa. The reaction between PVC and amines produced ammonium ions (−NH3 + /−NH2 + ), which reduced the CO2 captured by the pellet during stability testing. This issue was partially resolved by replacing PVC62 with p ‐phenylenediamine‐modified PVC62, which also enhanced the pellet CO2 capture to 1.5 mmol CO 2 g −1 . Abstract : Ashes to ashes : Immobilized amine CO2 sorbents are pelletized using a combination of fly ash and hydrophobic poly(vinyl chloride) (PVC). The resulting binder network produces pellets with high crush strength, good CO2 capture, and hydrophobicity. The attachment of aromatic amines to PVC enhanced both CO2 capture and resistance to pellet degradation.