USING ALKALINE FLY ASH AND SIMILAR BYPRODUCTS IN AN ION EXCHANGE/REVERSE OSMOSIS PROCESS FOR THE PRODUCTION OF SODIUM CARBONATE

摘要

The proposed invention uses industrial byproducts such as fly ash in an ion exchange/reverse osmosis (IE/RO) patented technology to sequester carbon dioxide CO2 gas and produce 6 to 7% sodium carbonate (Na2CO3) liquor. Similar materials encompass alkaline Fly Ash (AFA) liquor, alkaline red mud (ARM), coal ash, wood ash, and similar natural byproduct materials that are rich in metallic oxides. The process uses AFA or ARM at the input of an IE/RO process where the hydroxides (OH") get extracted and concentrated for CO2 gas sequestration. The remaining insoluble byproduct material is used in civil works such as construction and road industry. Ion exchange modules are used to remove all multivalent ionic impurities while a reverse osmosis (RO) skid concentrates the carbonated liquor up to 6 to 7% liquor (or 10% in advanced RO). The process is not an electrochemical chloro-alkali battery nor related to the ammonical Solvay process. The invention is inherently harnessed for carbon capture in the production of soda chemicals from waste alkaline byproducts. There are similarities in the hardware of patent # WIPO Patent App. No.PCT/IB2009/007713.