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Pelletization of Immobilized Amine Carbon Dioxide Sorbents with Fly Ash and Poly(vinyl chloride)
Author(s) -
Wilfong Walter Christopher,
Gray McMahan L.,
Kail Brian W.,
Howard Bret H.
Publication year - 2016
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201500419
Subject(s) - sorbent , pelletizing , amine gas treating , vinyl chloride , nuclear chemistry , pellet , chemistry , fly ash , polyvinyl chloride , ammonium bromide , polymer chemistry , materials science , polymer , organic chemistry , adsorption , composite material , pulmonary surfactant , analytical chemistry (journal) , biochemistry , copolymer
A combination of coal fly ash (FA) and a polymer binder, namely, poly(vinyl chloride) (PVC), was used to pelletize immobilized amine CO 2 sorbents. The pelletization of mixtures of FA and 50 wt % tetraethylenepentamine (TEPA) or ethylenimine oligomer mixture ( M w =423)/silica (EI 423 ‐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 CO 2 capture. The optimum pellet, FA/EI 423 ‐S (20/80)_PVC 62 [10 wt % PVC 62 ( M w =62 000), 17 wt % FA], captured 1.33 mmolCO2 g −1 and exhibited a crush strength of 1.42 MPa. The reaction between PVC and amines produced ammonium ions (−NH 3 + /−NH 2 + ), which reduced the CO 2 captured by the pellet during stability testing. This issue was partially resolved by replacing PVC 62 with p ‐phenylenediamine‐modified PVC 62 , which also enhanced the pellet CO 2 capture to 1.5 mmolCO2 g −1 .