| 摘要 |
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 1.75x10-5, and an effective 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 sulfuric, sulfamic, and oxalic. Preferred ranges, for a drain cleaner 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 preferably from 2 to 80% water. Corrosion inhibitors and carbon dioxide generating agents may be included. In a particularly preferred embodiment, ammonium chloride may be incorporated in an amount of from 0.1 to 10% by weight.
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