Mixed-cation adsorbent production with single pass ion exchange

摘要

An improved process for production of mixed cation-exchanged adsorbents that involves a single pass ion exchange. The precursor (non-exchanged) zeolite is treated with a combined essentially stoichiometric and excess solution of desirable weakly held and strongly held cations so that the resultant zeolite has the required mixed cation composition, while consuming smaller amounts of weakly held cation. Ion exchange post-treatment includes an optional equilibration step which may be controlled to establish a desired concentration and distribution of cations within the adsorbent and an optional washing step. <IMAGE>