W. R. Grace Co.-conn.

Chemed Corporation

W. R. Grace Co.

Dearborn Chemical Company Ltd.

Betzdearborn, Inc.

R. W. Grace & Co.

Chih M Hwa

Dionisio G Cuisia

John A Kelly

Roger R Gaudette

Janet Neton

Patricia M Scanlon

Murrell L Salutsky

Brian Greaves

Jose T Jacob

Joseph C Fan

Mita Adhya

Robert P Kreh

Lai-Duien Grace Fan

Wun T Tai

Wayne A Mitchell

Anne H Kemp

Ronald L Oleka

Stephen Clifford Poole

Russell O Menke

Stephen C Poole

A method of treating an aqueous system is described which comprises incorporating in the system a hydroxylamine derivative of the general formula: ##STR1## wherein each of R.sub.1, R.sub.2 and R.sub.3 which may be the same or different represents hydrogen, alkyl of 1 to 8 carbon atoms or aryl or a water soluble salt thereof or a precursor thereof, and a tannin in a weight ratio of at least 2:1. This is particularly useful for boiler water systems.

Method for inhibition of oxygen corrosion in aqueous systems by the use

A method for inhibiting or preventing corrosion of metals in contact with an aqueous system containing dissolved oxygen comprising adding to the system an oxygen scavenger having the formula ##STR1## wherein n is 5 or 6, lactone derivatives thereof, or its water soluble salts, in an amount effective to substantially remove the dissolved oxygen.

Method of scavenging oxygen in aqueous systems

A method of comprising iron in an aqueous system comprising adding to the system a copolymer of styrene sulfonic acid and methacrylic acid or its water soluble salt in an amount effective to disperse the iron contained therein.

Method of dispersing iron

A composition and method of inhibiting corrosion in boiler-steam condensate systems comprising adding to the system N,N-dihydrocarbylhydroxylamine and N-hydrocarbylhydroxylamine in amounts effective to inhibit corrosion.

Composition and method for scavenging oxygen

This invention relates to controlling corrosion in aqueous systems and more particularly to using certain calcium insensitive phosphonomethyl amine oxide compounds. The compounds of this invention are water soluble phosphonomethyl amine oxides having at least one oxidized tertiary amine group of the formula: ##STR1## and water soluble salts thereof and having a cloud point of at least about 25 ppm.

Control of corrosion in aqueous systems using certain phosphonomethyl

This invention relates to controlling scale formation in aqueous systems and more particularly to using certain calcium insensitive phosphonomethyl amine oxide compounds having at least one oxidized tertiary amine group of the formula: ##STR1## and water soluble salts thereof.

Control of scale in aqueous systems using certain phosphonomethyl amine

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.

Control of scale in aqueous systems using certain phosphonomethyl amines

This invention relates to novel organic phosphonate compounds which can be used as water treatment agents. More specifically, this invention relates to the compound N,N-bis-phosphonomethyl taurine N-oxide which may be represented by the formula: ##STR1## and its water soluble salts, which can be employed for the control of scale and/or corrosion.

N,N-bis-phosphonomethyl taurine N-oxide and water-soluble salts thereof

This invention relates to a method for preventing corrosion and inhibiting the formation of scale deposition in aqueous systems. More specifically, it relates to using certain calcium insensitive phosphonomethyl amine compounds having the formula: ##STR1## wherein either R.sub.1 is selected from hydrogen, hydrocarbyl, hydroxy-substituted hydrocarbyl, alkoxy-substituted hydrocarbyl; and R.sub.2 is selected from hydrocarbyl, hydroxy-substituted hydrocarbyl, alkoxy-substituted hydrocarbyl, carboxyl-substituted hydrocarbyl, --CH.sub.2 PO.sub.3 H.sub.2, and --C.sub.2 H.sub.4 N(CH.sub.2 PO.sub.3 H.sub.2).sub.2 ; or R.sub.1 and R.sub.2 together form an alicyclic ring having 3 to 5 carbon atoms, optionally along with oxygen atoms, phosphorus atoms or both oxygen and phosphorus atoms in the ring, and water soluble salts thereof.

Corrosion of metals in contact with system water in an aqueous system is inhibited by adding to the system water an effective amount of an oxygen scavenger selected from the group of nitrones having the formula: ##STR1## wherein R.sub.1 and R.sub.2 may be the same or different and are each a member selected from the group consisting of hydrogen and hydrocarbon radicals having between 1 and 10 carbon atoms, and R.sub.3 is a hydrocarbon radical having between 1 and 10 carbon atoms; or water soluble salts thereof.

Control of corrosion in aqueous systems

This invention relates to novel organic phosphonate compounds and more particularly to the compound 4-phosphonomethyl-2-hydroxy-2-oxo-1,4,2-oxazaphosphonrinane N-oxide and water soluble salts thereof. These compounds are useful as water treatment agents which can be employed for the control of scale and/or corrosion control.

4-phosphonomethyl-2-hydroxy-2-oxo-1,4,2-oxazaphosphorinane N-oxide and

This invention relates to novel organic phosphonate compounds, and more particularly to ethoxylated N,N-bis-phosphonomethyl 2-(hydroxy) ethylamine N-oxides and their water soluble salts. These novel organic phosphonates are useful as water treatment agents which can be employed for the control of scale and/or corrosion.

Ethoxylated N,N-bis-phosphonomethyl 2-(hydroxy)ethylamine N-oxides and

A method and composition for inhibiting the corrosion of metal surfaces in contact with the system water of aqueous systems are disclosed, which use a combination of at least one compound selected from 2,5 dihydroxybenzene sulfonic acid and its water soluble salts and at least one amine selected from neutralizing amines and hydroxylamines.

A composition for inhibiting deposition of scale in aqueous systems is disclosed which comprises carboxymethylcellulose and gluconic acid or glucoheptonic acid or both, or their water soluble salts. The composition is incorporated in the aqueous system in concentrations sufficient to substantially completely prevent scale deposition.

Growing community of inventors

Palatine, IL, United States of America

Chih M Hwa