Patent ID: 7820591

Claim:
A dry regenerable sorbent for carbon dioxide capture from flue gas produced by fossil fuel-fired power plants including industrial boilers before being released to atmosphere or from fuel gas stream such as syngas produced by conversion of fossil fuel (e.g. gasification), by dry regenerable sorbent technology, wherein the sorbent comprises: solid raw materials comprising: 10˜60 wt % of an active component selected from carbonates or bicarbonates of sodium or potassium; 15˜40 wt % of a support selected from solid porous non-metallic materials hydrophilic and capable of imparting a required specific surface area to the sorbent; and 10˜60 wt % of an inorganic binder selected from cement-like, clay-like, and ceramic-like binders capable imparting mechanical strength to the sorbent, wherein the total weight of the solid raw materials being 100 wt %, and wherein the purity of active component is 98% or higher, and wherein the sorbent has a spherical shape, a specific surface area of 50 m 2 /g or more, and a porosity of 30% or more, bulk density of 0.4 g/ml or more, a carbon dioxide sorption capacity of 3% or more, a utilization efficiency of 7% or more, an attrition index (AI) of 90% or less, an average particle size of 60˜160 μm, and a particle size distribution of 40˜300 μm, and wherein the sorbent is used to capture and separate carbon dioxide in a fluidized-bed or transport absorber and a fluidized-bed or transport regenerator at a temperature range of 40˜200° C.