Adsorption of Water, Ammonia and Olefins on Cation-Exchanged Ion-Exchange Resins

Abstract

The adsorption of NH₃, H₂0, 1-butene, and 1, 3-butadiene on cation-exchanged sulfonate resins was studied at 60∼130°C. The water coordinated with the cation and the counter anion of the resin was removed by pre-evacuation above 130°C(Fig.1) and the adsorption of 1, 3- butadiene on Fe (III)-exchanged resin was remarkably enhanced by this pretreatment (Fig.2). The amount of adsorption generally increased with the basisity of the adsorbate: 1-butene <1, 3-butadiene<H₂0<NHs, and strongly depended on the electronegativity of the exchanged cation (Fig.6). The fact that the amount of adsorption per unit amount of cation increased with the increase in the cation concentration on the resin indicates that the activity to the cation site is not uniform (Fig.5). As for a series of 3 d-transition metal cation-exchanged resin, the activity for the adsorption of NH₃, 1, 3-butadiene, and H₂0 was in the order, Mn²⁺ <Co²⁺, Ni²⁺, Ni²⁺ >Zn²⁺ (Fig.7). Similar trends were also found for the heat of NH₃ adsorption and for the heat of wetting of water (Fig.8).