Patent ID: 8202370
Filing Date: 2012-06-19
Classification: B08B,C11D,F22B,F23J,F28G

Abstract:
1. A method for removing an acidic deposit containing a sulfur compound, which comprises: preparing an aqueous cleaning fluid comprising a prescribed molar amount of an alkali metal carbonate or alkali metal hydrogen carbonate; contacting the acidic deposit with a prepared aqueous cleaning fluid by spraying; collecting the contacted cleaning fluid; and recycling the collected cleaning fluid; measuring a rate of concentration increase of sulfate ion (SO determining a percent increase of the sulfate ion concentration per hour; and terminating the contact with the aqueous cleaning fluid after the increase per hour of the measured per cent increase becomes not more than 10%, wherein the prescribed molar amount of alkali mental carbonate is in the range of 1 to 2 moles per mole of the sulfur component and the prescribed molar amount of the alkali metal hydrogen carbonate is 2 to 4 moles per mole of the sulfur component.