Disclosed are novel ion-exchange and chelate-exchange resins having improved exchange kinetics for separating chemical species from liquids. The resins are prepared from copolymer beads consisting of a monovinyl aromatic monomer and a cross-linking monomer. The copolymer beads are functionalized such that weak-base exchange moieties are substituted at haloalkylated sites which are most accessible to diffusion into the beads, while hydrophilic, strong-base exchange moieties are substituted at haloalkylated sites which are least accessible to diffusion. The resins have improved exchange kinetics due to shortened diffusion path lengths for the chemical species being separated and improved diffusion into the resin beads due to the hydrophilic, strong-base exchange moieties.
所公开的新型离子交换
树脂和螯合交换
树脂具有更好的交换动力学,可用于从液体中分离
化学物质。这些
树脂是由单
乙烯基芳香族单体和交联单体组成的共聚物珠制备的。共聚物微珠经过官能化处理后,弱碱交换分子被取代在最容易扩散到微珠中的卤代烷基化位点上,而亲
水性强碱交换分子被取代在最不容易扩散到微珠中的卤代烷基化位点上。由于亲
水性强碱交换分子缩短了被分离
化学物质的扩散路径长度并改善了向
树脂珠的扩散,因此
树脂的交换动力学得到了改善。