Patent ID: 6689714
Filing Date: 2004-02-10
Classification: B01D,B01J

Abstract:
A layered core-in-shell sorbent consisting essentially of:a reactive core wherein the reactive core comprises at least one material selected from the group consisting of calcium oxides, calcium carbonates, copper oxides, chromium oxides, manganese oxides, magnesium oxides, magnesium carbonates, zinc oxides, zinc titanates, iron oxides, strontium oxides, and barium oxides; and a porous protective shell surrounding said reactive core to form a layered structure, wherein the shell comprises at least one separate layer of material selected from the group consisting of bentonite clay, attapulgite clay, zeolite, portland cements, high temperature cement, alumina, fly ash, calcium aluminates, and magnesium oxysulfate cement, said separate layer of material allowing diffusion of a compound or class of compounds to the reactive core while maintaining physical integrity of the sorbent under conditions of use.