Abstract
The cation exchange resins were prepared by means of suspension polymerization of styrene (St), methyl methacrylate (MMA), methyl acrylate (MA), and ethyl acrylate (EA) as a monomer, and di-vinyl-benzene (DVB) as a crosslinking agent. The adsorption and desorption characteristics of the resins for calcium and magnesium ions in the artificial seawater and artificial regenerant solution were studied. The polystyrene resin with 4% di-vinyl-benzene crosslinking was sulfonated at 100°C for 10hours, and the sulfonated resins showed the fastest desorption velocity for calcium and magnesium ions. The mechanical strength and amount of swelling decreased with an increase in the degree of crosslinking. The carboxyled ethyl acrylate resin showed greater adsorption capacity for calcium and magnesium ions than the carboxyled methyl acrylate resin.
