Compositions – Water-softening or purifying or scale-inhibiting agents – Plant or organic material containing
Patent
1978-12-06
1980-09-02
Weinblatt, Mayer
Compositions
Water-softening or purifying or scale-inhibiting agents
Plant or organic material containing
252148, 252181, 252 86, 252 87, 252 855E, 134 40, 134 41, 422 12, C02B 506, C02B 118
Patent
active
042205506
ABSTRACT:
Sulfide-containing scale is removed from metal surfaces by contacting the encrusted surface with an aqueous acid cleaning solution having an aldehyde (e.g., formaldehyde) dissolved or dispersed in the acid in an amount sufficient to prevent the evolution of hydrogen sulfide gas.
REFERENCES:
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patent: 2965577 (1960-12-01), Bialik et al.
patent: 3077454 (1963-02-01), Monroe et al.
patent: 3335090 (1967-08-01), Dauldowitch et al.
patent: 3514410 (1970-05-01), Engle et al.
patent: 3669613 (1972-06-01), Knox et al.
Coffey Michael D.
Frenier Wayne W.
Huffines James D.
Smith Donald C.
The Dow Chemical Company
Weinblatt Mayer
White L. Wayne
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