Liquid purification or separation – Processes – Preventing – decreasing – or delaying precipitation,...
Patent
1989-12-15
1991-12-03
Hruskoci, Peter
Liquid purification or separation
Processes
Preventing, decreasing, or delaying precipitation,...
252180, C02F 514
Patent
active
050697986
ABSTRACT:
This invention relates to certain calcium insensitive phosphonomethyl amine compounds and their use as scale control agents for treating aqueous systems. The compounds of this invention are water-soluble phosphonomethyl amine compounds having the formula: ##STR1## and water soluble salts thereof selected from the group consisting of N-phosphonomethyl iminodiacetic acid, N,N-bis-phosphonomethyl- 2-(hydroxyethoxy)ethylamine, 4-(phosphonomethyl)-2-hydroxy-2-oxo-1,4,2-oxazaphosphorinane, N,N-bis-phosphonomethyl taurine and N,N-bis-phosphonomethyl ethylamine; and having a cloud point of at least about 25 ppm as determined by the CA500 cloud point test or a water soluble salt of said phosphonomethyl amine.
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Gaudette Roger R.
Hwa Chih M.
Kelly John A.
Neton Janet
Scanlon Patricia M.
Barr James P.
Hruskoci Peter
Shideler Krisanne
W. R. Grace & Co.,-Conn.
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