C - Chemistry – Metallurgy – 11 – D
Patent
C - Chemistry, Metallurgy
11
D
149/19
C11D 7/08 (2006.01) C11D 7/10 (2006.01) C23G 1/04 (2006.01)
Patent
CA 1252698
ABSTRACT OF THE DISCLOSURE An acid cleaner composition to remove deposits capable of reacting with the acid and also forming thereby hydrogen sulfide, comprising from about 5 to 95% by weight of an acid having an ionization constant of at least about 1.75 x 10-5, and an effec- tive amount of a hydrogen sulfide scavenger agent providing a cation reactive with hydrogen sulfide to form a water-insoluble sulfide, whereby a substantial portion of the hydrogen sulfide is converted to said insoluble sulfide. The cations include Cu+2, Pb+2, Cd+2, Sb+3, and Sn+4, while typical acids are sul- furic, sulfamic, and oxalic. Preferred ranges, for a drain clean- er composition, are from about 40 to about 95% acid by weight, and from 2 to about 10% scavenger agent by weight. The compositions may be in solid form, or as an aqueous solution, containing pre- ferably from 2 to 80% water. Corrosion inhibitors and carbon dioxide generating agents may be included. In a particularly pre- ferred embodiment, ammonium chloride may be incorporated in an amount of from 0.1 to 10% by weight.
496071
Shaer Elias H.
Zembrodt Anthony R.
Bristol-Myers Squibb Company
Gowling Lafleur Henderson Llp
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