초록 ▼

Alkaline earth metal scales, particularly barium sulfate and strontium sulfate, and silica-based scales, particularly potassium fluorosilicate, are removed from industrial processing equipment, tubular goods, and other scaled materials with a composition comprising sufficient potassium base to provi

Alkaline earth metal scales, particularly barium sulfate and strontium sulfate, and silica-based scales, particularly potassium fluorosilicate, are removed from industrial processing equipment, tubular goods, and other scaled materials with a composition comprising sufficient potassium base to provide an overall system pH of between about 12.0 to about 14.0, a polyaminocarboxylic acid, preferably EDTA, a hydroxycarboxylic acid synergist, a pH buffering agent, a wetting agent, and optionally a sodium base.

대표청구항 ▼

[ We claim:] [1.] A composition for dissolving alkaline earth metal scales and silica-based scales wherein said composition is an aqueous solution having a pH of from about 12.0 to about 14.0 which exhibits maximum scale-dissolving potential upon dilution with equal parts by volume of water, said co

[ We claim:] [1.] A composition for dissolving alkaline earth metal scales and silica-based scales wherein said composition is an aqueous solution having a pH of from about 12.0 to about 14.0 which exhibits maximum scale-dissolving potential upon dilution with equal parts by volume of water, said composition comprising:a) from about 45% to about 55% by weight of the total composition of a potassium base;b) from about 0.5M to about 2.0M of ethylenediaminetetraacetic acid or a potassium salt thereof;c) from about 10% to about 15% by weight of of the total composition of sodium glucoheptonate;d) a pH buffering agent comprising a potassium salt; ande) a wetting agent.