Method for removing dibasic calcium hypochlorite scale

Details Method for removing dibasic calcium hypochlorite scale Method for removing dibasic calcium hypochlorite scale

1983-08-01

1984-11-20

Doll, John

Chemistry of inorganic compounds

Halogen or compound thereof

Ternary compound

134 221, 134 2216, 134 2217, 134 2, C01B 1106

Patent

active

044838425

ABSTRACT:
Dibasic calcium hypochlorite scale present on the surfaces of process equipment, e.g., process vessels, used for the manufacture of neutral calcium hypochlorite is removed chemically by controllably adding chlorine to the process liquor under conditions of agitation while maintaining the pH of the process liquor at at least 7, e.g., from about 7 to about 10.5, thereby to solubilize the dibasic calcium hypochlorite scale without producing substantial amounts of elemental chlorine. In a preferred embodiment, the process liquor in the process equipment containing the dibasic calcium hypochlorite scale is forwarded to a further process vessel containing other less alkaline process liquor to which the chlorine is controllably added. The resulting hydrochloric acid-containing process liquor is recycled to the process equipment containing the dibasic scale and this procedure continued until the desired amount of dibasic calcium hypochlorite scale is solubilized.

REFERENCES:
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patent: 4328200 (1982-05-01), Welch et al.
patent: 4390512 (1983-06-01), Loehr

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