Adsorption equilibrium of chelating resin for Fe~(2+) in organic amine desulfurization solution

Four chelating resins were selected to compare their static adsorption and desorption on Fe2+ in the organic amine desulfurization liquid.D751 chelating resin showed high selectivity and good desorption property.Static sorption experiments were carried out to study the adsorption equilibrium of Fe2+on D751 chelating resin at different temperatures,and the adsorption mechanism was discussed by using FI-IR.The experimental results showed that the adsorption behavior of Fe2+ on D751 resin could be well described by either Langmuir or Freundich isotherm and the negative value of ΔG and the positive value of S showed that the adsorption was a spontaneous process with increasing entropy,and the increase of temperature would benefit the adsorption process.Ion exchange and chelating adsorption were responsible for the removal of Fe2+by FI-IR.