| abstract |
A method for inhibiting corrosion of steel materials used for a carbon dioxide gas removing apparatus, characterized in that, in a process of absorbing and removing carbon dioxide gas in a synthesis gas using as an absorber an aqueous carbonate solution, 1-hydroxyethylidene-1, 1-diphosphonic acid is added to the aqueous carbonate solution. According to this method, corrosion of steel materials can be inhibited without using conventional Na2CrO4, V2O5, etc. that are subject to control of pollutants. |