from solution causing fouling of the equipment above this range carbon dioxide is released this regenerative step uses relatively mild conditions the pressure of the process remains the same as in step one the temperature is raised to a point in the range of 500 c to 120 u00b0 c but a level below boiling is generally sufficient for the complete evolution of carbon dioxide because of the limited solubility of sodium bicarbonate sodium chloride in the scrubbing solution can be replaced by potassium chloride the resulting chemistry is essentially the same also an amine can be substituted for ammonia in the process for example n propylamine has a boiling point of 49 u00b0 c and is miscible in water recourse to the common solvent monoethanolamine is also possible a better appreciation of the present invention can be gained by reference to figure i this diagram illustrates the principal features of the process flue gas enters the base of absorption column 1 nitrogen exits the top of the column and solvent loaded with carbon dioxide is pumped from the bottom of the column to the head of stripping column 2 in the latter unit carbon dioxide is released after the temperature of the solvent is raised in a heat exchanger not shown half a cup of ammonia solution used by consumers as an u201c all purpose cleaner u201d was added to half a cup of sparkling carbonated water after.