| 摘要 |
A process for the removal of co2 from a gas comprising the steps of : (a) contacting the gas (1) in an absorber (2) with an aqueous solution of one or more carbonate compounds in the presence of an accelerator, thereby reacting at least part of the co2 to form a bicarbonate compound, under conditions such that at least a part of the bicarbonate compound formed precipitates, forming a bicarbonate slurry; (b) subjecting at least part of the bicarbonate slurry to a concentration step (5) to obtain an aqueous solution (6) and a concentrated bicarbonate slurry (7), wherein the concentrated bicarbonate slurry comprises from 20 to 80 wt% of bicarbonate compounds; (c) returning at least part of the aqueous solution to the absorber; (d) pressurising (8) the concentrated bicarbonate slurry, (e) transferring the pressurised concentrated bicarbonate slurry to a regenerator (12) and applying heat to obtain a co2-rich gas stream (13) and a regenerated carbonate stream (14). |
