FILTERING AND DESALTING METHOD BY MIXED-BED ION EXCHANGER

摘要

PURPOSE:To establish the condition for regenerating a desalter by backwashing or chemicals in the removal of suspended impurities using an ion-exchange resin. CONSTITUTION:The grainy cation-exchange resin and anion-exchange resin having a granular bonding structure on the surface layer are mixed to form the mixed bed which is placed in a desalter. The suspended impurities in water are removed and filtered off by the desalter. In this method, the desalter is backwashed and regenerated when the differential pressure of the resin bed increases to 0.2-0.8kg/cm<2> due to the collection of the suspended impurities, and chemicals are passed through the bed to regenerate the bed when the suspended impurity concn. increases to >=1.5ppb at the inlet of the desalter.