Acid cleaner and process for disposal thereof
AssigneeBASF Wyandotte Corporation
InventorsJoseph V. Otrhalek, Gilbert S. Gomes, Robert E. Gansser
Life of this patent
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Abstract
A thickened acid cleaner concentrate composition comprising an inorganic acid, e.g., hydrochloric, an organic acid, e.g., oxalic, a nonionic surfactant, an anionic surfactant, a flocculating agent such as iron or aluminum ion and water is useful in cleaning vehicles such as railroad equipment. The waste water is then treated by flocculation and separation to remove suspended solids and entrained BOD prior to discharge or re-use within the plant. The flocculating agent in the composition provides a proportional pretreatment of the waste to facilitate the final treatment and separation of waste in the used composition.
Claims8
A thickened acid cleaner concentrate composition consisting essentially of:
- (1) a strong aqueous inorganic acid in an amount from about 5 to about 78 weight percent,
- (2) an organic acid selected from the group consisting of oxalic, tartaric, citric acid and mixtures thereof in an amount from about 1 to about 6 weight percent,
- (3) a nonionic surfactant in an amount from about 7 to about 23 weight percent,
- (4) an anionic surfactant in an amount from about 1 to about 7 weight percent,
- (5) a flocculating agent containing bivalent iron, trivalent iron or trivalent aluminum in soluble form in acid solution and in an amount of from about 1 to about 12 weight percent, and
- (6) water in an amount from about 75 to about 12 weight percent;
- all weight percents being based on the total composition,
- provided that the said nonionic surfactant and the said anionic surfactant when taken together constitute from about 10 to about 30 weight percent of said composition and said nonionic surfactant constitutes from about 75 to about 90 weight percent of the combined weight percent of nonionic and anionic surfactants.
Dependencies are inferred from the claim text.