Process for preventing corrosion and the formation of scale in water circulating system
AssigneeBayer Aktiengesellschaft
InventorsGerhard Bohnsack, Hans Geffers, Herbert Kallfass, Walter Radt
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Abstract
Preventing corrosion and scale formation in water re-circulating systems by adding to the water to be circulated from about 5 to 100 g/m.sup.3, based on the weight of the water to be circulated, of a compound selected from the group consisting of those of the formula ##STR1## and the water-soluble salts thereof and then circulating said water in said system, R being hydrogen, alkyl, alkenyl or alkinyl having up to 4 carbon atoms; phenyl; cycloalkyl having 3 to 6 carbon atoms; benzyl; phenethyl or ##STR2## wherein R' is hydrogen, alkyl having 1 to 4 carbon atoms or carboxyl, R" is hydrogen or methyl and R'" is carboxyl.
Claims3
A composition for preventing corrosion and the formation of scale in water-conducting systems which comprises by weight 1 to 20% of a Zn salt, 5 to 30% by weight of H.sub.3 PO.sub.4, and the balance of a compound of the formula ##STR5## wherein R is hydrogen, alkyl, alkenyl, or alkinyl having up to 4 carbon atoms;
- phenyl;
- cycloalkyl having 3 to 6 carbon atoms;
- benzyl;
- phenethyl or ##STR6## wherein R' is hydrogen, alkyl having 1 to 4 carbon atoms or carboxyl, R'' is hydrogen or methyl and R''' is carboxyl or a water soluble salt thereof.
Dependencies are inferred from the claim text.