| Abstract |
A process for heating an aqueous liquid having scale forming salts of calcium therein which comprises adding to said aqueous liquid a scale inhibiting amount of a polymeric antiscalant comprising: (A) 1,2-dihydroxy-3-butene monomer units said 1,2-dihydroxy-3-butene monomer units being present in an amount in the range of from about 1 mole percent to about 50 mole percent and, (B) at least one monomer unit derived from the group consisting of maleic acid, acrylic acid, acrylamide acid, itaconic acid, vinyl sulfonic acid, styrene sulfonic acid N-tertbutylacrylamide, butoxymethylacrylamide, N N-dimethylacrylamide, sodium acrylamidomethyl propane sulfone acid and salts thereof, with the proviso that said polymeric additive does not include the monomer unit =(CH2-CH=CH-CH2-O)=. |