METHOD OF INCREASING RECOVERY OF CARBON DIOXIDE FROM SULFURIC ACID PLANT FURNACE

摘要

PROBLEM TO BE SOLVED: To provide a method of increasing the recovery yield of carbon dioxide which is a by-product from a sulfuric acid manufacturing plant. SOLUTION: The yield of the carbon dioxide in the purging gas obtained from the sulfuric acid manufacturing plant is increased by adding the enriched oxygen to this sulfuric acid plant. Not only the concentration of the carbon dioxide in the flue gas emitted from the plant is increased by the increase in the amount of the oxygen but the increase in the maximum temperature at which a catalyst converts sulfur dioxide to sulfur trioxide is suppressed. The CO2 recovered form the purging gas is then refined and is passed through a carbon dioxide liquefying plant capable of forming the carbon dioxide of good quality.