Method and Apparatus for the Removal of Carbon Dioxide from a Gas Stream

A method for removing at least a portion of carbon dioxide in a gas stream and producing salable calcium chloride, comprising:

• contacting a gas stream comprising carbon dioxide and hydrogen chloride with a calcium-based alkaline liquid stream;
• absorbing at least a portion of the hydrogen chloride into the alkaline liquid stream to produce dissolved chloride;
• mixing at least a portion of the alkaline liquid stream comprising the dissolved chloride with a calcium-based alkaline reagent to produce solid calcium chloride;
• separating the solid calcium chloride from the portion of the alkaline liquid stream;
• after said contacting, further contacting the gas stream with an alkaline liquid stream;
• and
• absorbing at least a portion of the carbon dioxide into the alkaline liquid stream.

A method for removing at least a portion of carbon dioxide in a gas stream and producing salable carbon dioxide, comprising:

• contacting a gas stream comprising carbon dioxide with an alkaline liquid stream comprising at least sodium bicarbonate;
• absorbing at least a portion of the carbon dioxide into the alkaline liquid stream to produce absorbed carbon dioxide;
• mixing at least a portion of the alkaline liquid stream comprising the absorbed carbon dioxide with reclaimed sodium carbonate to precipitate the sodium bicarbonate in the portion of the alkaline liquid stream and produce precipitated sodium bicarbonate;
• heating the precipitated sodium bicarbonate to decompose the precipitated sodium bicarbonate to produce sodium carbonate;
• and
• mixing the sodium carbonate with portion of the alkaline liquid stream.