Liquid purification or separation – Processes – Preventing – decreasing – or delaying precipitation,...
Patent
1988-02-22
1989-08-15
Hruskoci, Peter
Liquid purification or separation
Processes
Preventing, decreasing, or delaying precipitation,...
252180, 166279, C02F 514
Patent
active
048572055
ABSTRACT:
A method for inhibition of scale formation using a composition comprising an N-phosphonomethylated amino-2-hydroxypropylene polymer having a molecular weight of between about 300 and about 5000 and having the structural formula ##STR1## wherein (i) R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are independently selected from the group consisting of hydrogen, phosphonomethyl radical corresponding to the formula --CH.sub.2 PO(OH).sub.2, and water treating acceptable salts of such phosphonomethyl radical, with the proviso that the percentage of R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 being hydrogen does not exceed about 30; (ii) R is a divalent radical selected from the group consisting of (a) unsubstituted alkylene groups having at least about 2 and at most about 12 carbon atoms, (b) substituted alkylene groups having at least about 2 and at most about 12 carbon atoms wherein at least one hydrogen of the alkylene group is substituted with a radical selected from the group consisting of methyl, ethyl, propyl, butyl, methyl ammonium, ethyl ammonium and ammonium groups, and the other hydrogens of the substituted alkylene group are unsubstituted, (c) cycloalkylene groups having at least 3 and at most about 12 carbon atoms, and (d) --R'--N--R"-- wherein R.sub.7 is defined as R.sub.1, R.sub.2 R.sub.3, R.sub.4, R.sub.5 and R.sub.6 above, with the proviso that the percentage of R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6 and R.sub.7 being hydrogen not exceed about 30, and R' and R" are independently selected from the group consisting of such unsubstituted alkylene groups, and such cycoalkylene groups; and (iii) n is from about 1 to about 25 is disclosed.
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Dhawan Balram
Przybylinski John L.
Redmore Derek
Hruskoci Peter
Petrolite Corporation
Solomon Kenneth
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