Patent ID: 8512445
Filing Date: 2013-08-20
Classification: B01D,C01B,C01F,Y02C,Y02P

Abstract:
1. A process for reducing the amount of carbon dioxide in a carbon dioxide-containing gas stream comprising: introducing said carbon dioxide-containing gas stream and a carbonate-containing solution into a chamber; contacting said carbon dioxide-containing gas stream and said carbonate-containing solution in said chamber such that at least a portion of carbon dioxide from said carbon dioxide-containing gas stream is absorbed in the carbonate-containing solution; converting at least a portion of said carbon dioxide and said carbonate in said carbonate-containing solution to bicarbonate to produce a carbon dioxide-, bicarbonate-, carbonate-containing solution; transferring at least a portion of heat from the carbon dioxide-, bicarbonate-, carbonate-containing solution exiting the chamber to the carbonate-containing solution such that the temperature in the chamber is from about 50° C. to about 90° C.; precipitating a bicarbonate-containing solid out of said carbon dioxide-, bicarbonate-, carbonate-containing solution; concentrating said bicarbonate-containing solid to a bicarbonate-containing slurry; and stripping said bicarbonate-containing slurry to produce a carbon dioxide product, wherein the stripping is carried out in a pressurized stripping column having a pressure in the range of from 5 to 60 bar.