Cleaning and liquid contact with solids – Processes – For metallic – siliceous – or calcareous basework – including...
Patent
1992-12-04
1995-11-14
Silbaugh, Jan H.
Cleaning and liquid contact with solids
Processes
For metallic, siliceous, or calcareous basework, including...
134 2, 134 10, 134 41, 210688, C23G 102, C02F 142
Patent
active
054662974
ABSTRACT:
A method is described for removing ferrometal corrosion products from cooling water systems, which method recycles ferrous/ferric complexing agents and leads to low volume highly concentrated iron wastes for disposal. The method combines, preferably, the use of citric acid or citric acid-tannin complexing agents with erythorbic acid reducing agents to clean corroded surfaces followed by recovery of both complexing and reducing agents for recycle by contacting spent cleaning solution with strong acid cation exchange resins or chelating resins. The resins remove and retain iron species, releasing chelating and reducing agents to resin bed effluents. These are recycled. A concentrated iron waste stream is recovered by regenerating the resin beds with strong acids, preferably HCL, H.sub.2 SO.sub.4, and the like.
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"Effect of Citric Acid Cleaning on Steel Corrosion, especially welds in AISI-304 stainless equipment, 1967-Dec. 1987", Literature Search Report No. 2396, by Steve Boyle.
"Use of Erythorbic (Isoascorbic, Araboascorbic) Acid for Removal of Iron Deposits and Iron Corrosion Products from Boilers, Pipes, and Other Ferrous Metal Surfaces" Literature Search Report No. 1163, by Carmen Nitsche Jul. 1990.
Goodman Walter H.
Johnson Donald A.
Rao Narasimba M.
Chaudhry Saeed
Drake James J.
Miller Robert A.
Nalco Chemical Company
Silbaugh Jan H.
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