Abstract: An oxygen scavenger characterized in that the effective component thereof consists of a heterocyclic compound with N--N bond in a ring thereof An oxygen scavenger characterized in that the effective component thereof consists of a heterocyclic compound with N-substituted amino group. An oxygen scavenger characterized in that the effective component thereof consists of a heterocyclic compound represented by the following formula: ##STR1## (wherein a, b are integers between 0 and 5 to satisfy a relation "2.ltoreq.a+b.ltoreq.5"). ##STR2## An oxygen scavenger characterized in that the effective component thereof consists of azodicarbonamide. An oxygen scavenger characterized by including a heterocyclic compound with N-substituted amino group, or the salt thereof, and a hydroxybenzene derivative. Those may contain further neutral amine, alkalic agent and/or water soluble polymer.

Abstract: A description is given of compounds of the formula ##STR1## in which the general symbols are as defined in claim 1, and of their zirconium, bismuth and calcium salts, and of the salts with the compounds of the formula II ##STR2## in which the general symbols are as defined in claim 1, as corrosion inhibitors in coating compositions for protecting metallic surfaces.

Abstract: Use of a mixture of at least one alkanolamide of general formula (I), wherein R is a hydrocarbon group having 7-23 carbon atoms, preferably 11-23 carbons atoms, A is an alkyleneoxy group having 2-4 carbon atoms and n is 2-12, preferably 2-8, and at least one alkoxylated alcohol in a weight ratio between the alkoxylated alkanolamide and the alkoxylated alcohol from 10:1 to 1:10, preferably in the range from 5:1 to 1:5 for producing a water-base liquid system with reduced flow resistance between the flowing, water-base liquid system and a solid surface.

Abstract: The use of halo-benzotriazoles as corrosion inhibitors in aqueous systems is disclosed. Specific isomers of chloro-methylbenzotriazole were found to be more effective corrosion inhibitors than tolyltriazole in the presence of chlorine.

Abstract: A method for removing dissolved oxygen from alkaline water containing dissolved oxygen at a temperature greater than 250.degree. F. which comprises the step of: adding to said alkaline water containing dissolved oxygen an effective oxygen-scavenging amount of a water-soluble semicarbazide of the formula ##STR1## wherein R.sub.1 and R.sub.2 are selected from the group consisting of C.sub.1 -C.sub.10 alkyl, cycloalkyl, aryl, cycloalkyloxy and alkyloxy groups.Preferred materials are 4-phenyl semicarbazide, 4-isopropyl semicarbazide, 4-4-diethyl semicarbazide and carbazoyl morpholine. Below 400.degree. F., a catalyst is also required.

Abstract: Compositions and methods relating to cementitious compositions are provided. The addition of an amidoamine that is the reaction product of polyalkylenepolyamines and short-chain alkanedioic acids or reactive derivatives thereof to cementitious compositions has been found useful in inhibiting the corrosion of ferrous metal articles in contact with said composition. The amidoamine is advantageously employed in combination with a hydrophobe compound that enhances corrosion inhibition. The invention also provides aqueous emulsions which contain the amidoamine, one or more hydrophobes, and an emulsifier for the hydrophobe.

Abstract: A method of use of a composition including either or both isomers of hydrogenated methylbenzotriazole, namely, 5-Methyl-1H-Benzotriazole or 4-Methyl-1H-Benzotriazole which have been at least about 50% hydrogenated, to form corrosion inhibiting films on metal surfaces in an aqueous environment. The hydrogenated methylbenzotriazole compositions provide both improved passivation and improved film persistence when charged to aqueous industrial systems either on a continuous or on an intermittent basis. Continuous dosing is generally kept at a constant >0.5, typically 1-2 ppm in the aqueous system to be treated; intermittent doses are generally 10-20 ppm once every week or two or more.

Abstract: A method and compounds for inhibiting and controlling corrosion is disclosed. The method is particularly effective at inhibiting or preventing corrosion of ferrous-based metals in contact with aqueous systems such as cooling water systems. The method comprises introducing into the aqueous system a compound of the general formula: ##STR1## wherein R is hydrogen, alkyl, aryl, substituted alkyl or substituted aryl; R' and R" are each independently hydrogen, C.sub.1-4 alkyl or C.sub.1-4 substituted alkyl; Z is O, S, NH, or NR, where R is as described above; n is a positive integer greater than 1; f is a positive integer; and M is hydrogen, a water soluble cation (e.g., NH.sub.4.sup.+, alkali metal), or a C.sub.1 -C.sub.3 alkyl group.

Abstract: A method and composition for simultaneously controlling the deposition of scale and the formation of corrosion in a cooling water system comprising adding to the system a combination of (a) a water soluble copolymer having the structure: ##STR1## wherein R.sub.1 is H or lower (C.sub.1 -C.sub.4) alkyl, F is H.sub.2 or O, M is a water soluble cation, R.sub.2 is (CH.sub.2 --CH.sub.2 --O).sub.n, ##STR2## or mixture of both, n is an integer of from 1 to about 40, R.sub.3 is H, lower (C.sub.1 -C.sub.4) alkyl or an acetate, and (b) a water soluble polymer characterized by the structural formula: ##STR3## wherein R.sub.1 is H or lower alkyl (C.sub.1 -C.sub.3); R.sub.2 is OH, OM, or NH.sub.2 ; M is a water soluble cation; R.sub.

Abstract: The use of halo-benzotriazoles as corrosion inhibitors in aqueous systems is disclosed. Halo-benzotriazoles such as chloro-tolyltriazole and bromo-tolyltriazole were found to be more effective corrosion inhibitors than tolyltriazole in the presence of chlorine.

Abstract: The use of halo-benzotriazoles as corrosion inhibitors in aqueous systems is disclosed. Halo-benzotriazoles such as chloro-tolyltriazole and bromo-tolyltriazole were found to be more effective corrosion inhibitors than tolyltriazole in the presence of chlorine.

Abstract: Primary amines, ammonia, or mixtures thereof can be detected using a reagent comprising from about 650 ppm to about 25 percent by weight of phthalic dicarboxyaldehyde; from about 74 to about 99.88 percent by weight of an alkali metal borate; and, from about 550 ppm to about 22 percent by weight of a nucleophile.

Abstract: A low toxic corrosion inhibitor comprises (A) mercaptocarboxylic acid having from 2 to 6 carbon atoms, and (B) a polyamine/fatty acid/carboxylic acid adduct. The preferred combination of (A) and (B) includes mercaptoacetic acid and ethylenetetramine/tall oil acd/acrylic acid adduct.

Abstract: The addition of an effective amount of a liquid modified diethanolamide which is suitably a reaction product of cocoamide and phthalic anhydride to a calcium chloride composition, which can be a brine solution or a solid, reduces the amount of corrosion of metals by the resulting composition. The calcium chloride/diethanolamide composition can be used as a deicer composition.

Abstract: 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.

Abstract: This invention relates to the use of iminoalkylenephosphonic acids to prevent corrosion, including both localized corrosion and general corrosion on iron based metal surfaces in contact with a corrosive system water in an aqueous system. The invention also relates to the use of the iminoalkylenephosphonic acids to control formation, deposition and adherence of scale at the surfaces of metals in contact with a scale-forming system water in an aqueous system.

Abstract: A method of combating corrosion of a metal which comprises contacting such metal with a composition containing polyamino acids, their salts and their anhydrides, together with at least one corrosion inhibitor selected from the group consisting of benzotriazole, 4-C.sub.1 -C.sub.4 -alkylbenzotriazoles and 5-C.sub.1 -C.sub.4 -alkylbenzotriazoles.

Abstract: A method for inhibiting corrosion in an aqueous medium is disclosed. The method comprises incorporating into the medium an amount of a water-soluble corrosion inhibitor sufficient to inhibit corrosion. The corrosion inhibitor comprises an N-ethoxy, 2-substituted imidazoline, the N-ethoxy substituent having from one to about thirty ethoxy units and the 2-substituent being an unsaturated or polyunsaturated fatty chain of from about six to about thirty carbons. If the medium is sweet, the inhibitor further comprises a phosphate ester derived from a water-soluble oxyethylated, straight chain alcohol of from about two to about thirty carbons. Corrosion inhibitor compositions useful in such method are also disclosed.

Abstract: Corrosion prevention compositions which contain lactobionic acid N-alkylamides, and further having a pH below 9.0, are described. In particular, lactobionic acid N-alkylamides in which the saturated or unsaturated alkyl group bonded via the amide function has a chain length of 8 to 18 carbon atoms show a good corrosion-inhibiting action. The use of lactobionic acid N-alkylamides in corrosion prevention compositions and metalworking compositions is also described.

Abstract: The invention is an effective, easy to produce, and economical corrosion inhibitor which can be used in a variety of environments. The corrosion inhibitor of the present invention is the salt of certain tertiary amines. The corrosion inhibitor is the reaction product of one or more tertiary amines and certain carboxylic acids, preferably a mixture of mercaptocarboxylic and carboxylic acids.

Abstract: The use of halo-benzotriazoles as corrosion inhibitors in aqueous systems is disclosed. Halo-benzotriazoles such as chloro-tolyltriazole and bromo-tolyltriazole were found to be more effective corrosion inhibitors than tolyltriazole in the presence of chlorine.

Abstract: Control of formation of heat stable amine salts and of corrosion in an amine solvent treating system is accomplished by introduction of N,N-diethylhydroxylamine catalyzed with hydroquinone into the system. The catalyzed N,N-diethylhydroxylamine is effective at the temperature ranges of amine treating systems to effectively reduce formation of heat stable amine salts and to inhibit corrosion. The catalyzed N,N-diethylhydroxylamine is effective in proportions including the range of about 0.5 to about 6 parts N,N-diethylhydroxylamine to 1 part hydroquinone.

Abstract: This invention relates to water-soluble corrosion inhibiting compositions and the method of making the same. Specifically, this invention relates to inhibiting the corrosion of metals, particularly those employed in the production, processing, and transportation of petrochemical products. These water-soluble corrosion inhibiting compositions are created by neutralizing a C.sub.22 tricarboxylic acid with aminoethylethanolamine and a member selected from the group consisting of imidazoline, amidoamine, and combinations thereof. The resulting compositions exhibit excellent film persistency characteristics even when utilized in small amounts.

Abstract: Corrosion prevention compositions which contain lactobionic acid N-alkylamides are described. In particular, lactobionic acid N-alkylamides in which the saturated or unsaturated alkyl group bonded via the amide function has a chain length of 8 to 18 carbon atoms show a good corrosion-inhibiting action. The use of lactobionic acid N-alkylamides in corrosion prevention compositions and metalworking compositions is also described.

Abstract: The invention is a method for removing dissolved oxygen from alkaline water which comprises adding to alkaline water containing dissolved oxygen an effective oxygen-scavenging amount of a water-soluble carboxylate at temperatures above 400.degree. F. A preferred material is tartronic acid. At lower temperatures, a catalyst is also required.

Abstract: A biodegradable corrosion inhibitor, scale inhibitor and dispersant is provided. The inhibitor comprises one or more polymers from a family of poly(amino acid) polymers that include hydroxamic acid-containing sidechains. Methods of reducing corrosion and scale build-up and a method of dispersing solid particulates in a solution or slurry are provided by adding a polymer of the present invention to a solution or slurry.

Abstract: A corrosion inhibitor formulation for use in reinforced concrete structures, the inhibitor reducing the rate of corrosion in metallic reinforcing rods placed within the structures. The formulation comprises a mixture of alkali metal glucoheptonates and alkali metal molybdates.

Abstract: A method of producing low volatility amines for power plant pH control by in-situ hydrolytic decomposition of a more volatile amine with a ring structure. A ring amine having a certain molecular weight and a volatility is introduced into the pressurized water reactor. The ring amine undergoes at least partial in-situ hydrolytic decomposition to produce at least one daughter amine. The daughter amine has a molecular weight equal to or greater than the ring amine and has a volatility less than the ring amine. The daughter amine, and the mixture of the daughter amine and the ring amine act to control the pH in the reactor. In an alternative embodiment, the ring amine undergoes complete decomposition to form at least one daughter amine, and the daughter amine(s) acts to control the pH in the reactor.

Abstract: Odorant depletion is reduced by passivating the internal surface of LP-gas transportation and storage vessels by the addition of passivating agents comprising mixtures of corrosion inhibitors such as phosphate esters, fatty amines, poly amides, imidazolines, poly imidazolines, quaternary amines, poly quats, dimer acids, trimer acids, polymeric acids, ethoxylated fatty amines, ethoxylated polyamides, ethoxylated alcohols and mixtures thereof in one or more solvents. In a preferred embodiment, the passivating agents contain one or more phosphate esters defined by the equation:?R--X--?C.sub.m H.sub.2m O).sub.n !.sub.k --PO(OH).sub.

Abstract: The invention relates to imidazolidinone derivatives formed from the reaction of (1) a substituted-ethyl imidazolidinone; (2) substituted ethyl/propyl propylene urea or (3) a cyclic propylene urea with: (a) a C.sub.1 -C.sub.24 alkyl or a C.sub.3 -C.sub.24 alkenyl substituted anhydride or, (b) a C.sub.3 -C.sub.24 carboxylic acid or corresponding ester; their compositions and use as corrosion inhibitors and/or surfactants.

Abstract: An alkylbenzotriazole, in combination with mercaptobenzotriazole, tolyltriazole, benzotriazole and/or 1-phenyl-5-mercaptotetrazole, is used to inhibit the corrosion of metallic surfaces, particularly copper surfaces, in contact with an aqueous system. Systems and compositions are also claimed.

Abstract: In one aspect, am anti-corrosion treatment method of reducing internal corrosion of a liquid nitrogen fertilizer holding vessel comprising providing at least one quaternary-amine-comprising compound within the vessel. In another aspect, an anti-corrosion treatment method of reducing corrosion of a liquid nitrogen fertilizer holding vessel comprising: a) providing a substantially insoluble liquid film of a quaternary-amine-comprising compound over a volume of liquid nitrogen fertilizer within a steel vessel; and b) coating internal sidewalls of the steel vessel with the quaternary-amine-comprising compound as the volume of liquid fertilizer increases and decreases within the vessel. In another aspect, an anti-corrosion mixture comprising: a) a liquid nitrogen fertilizer solution; and b) a quaternary-amine-comprising compound within the liquid nitrogen fertilizer solution.

Abstract: A water-treating agent comprising a ternary copolymer of conjugated dienesulfonic acid/(meth)acrylic acid/2-hydroxyethyl (meth)acrylate, or a ternary copolymer of conjugated dienesulfonic acid/(meth)acrylic acid/(meth)acrylamido-2-methylalkanesulfonic acid ternary copolymer, is effective against scaling and fouling in water systems and a method for treating water with the water-treating agent. When combined with a corrosion inhibitor, the water-treating agent exhibits an excellent anti corrosion effect.

Abstract: Corrosion of ferrous metal surfaces in an aqueous system, such as a boiler system, is inhibited by adding a first component and a second component, the first component being preferably carbohydrazide, hydrazine, or a salt thereof, the second component being selected from the group consisting of certain hydroxylamine compounds or mixtures thereof, preferably N,N-diethylhydroxylamine. The weight ratio of the added first component to the added second component is between about 4:1 and about 1:4.

Abstract: A non-toxic solution to be used in the place of distilled or de-ionized water in autoclave sterilizers is disclosed. The solution renders the instruments placed in such sterilizers free of rust, spotting, and hastens the drying time of such instruments.

Abstract: A method for inhibiting the formation, deposition and adherence of scale forming salts including calcium carbonate and calcium phosphate in an aqueous system having a pH of at least 8.5 and a calcite saturation level of at least 100 times the solubility limit of calcium as calcite, including adding to the aqueous system a synergistic effective amount of a combination comprising (A) a polyether polyamino methylene phosphonate, (B) a terpolymer comprising the monomers of acrylic acid, sulfophenoxymethallyl ether and maleic acid, (C) a hydroxyphosphonoacetic acid, and (D) a phosphonocarboxylic acid copolymer.

Abstract: A polymer and method of controlling corrosion and the formation and deposition of scale imparting compounds in water systems is disclosed. The polymer has the general structure: ##STR1## wherein E.sup.1 comprises the repeat unit obtained after polymerization an .alpha.,.beta. ethylenically unsaturated carboxylic acid monomers, lower alkyl (C.sub.1 -C.sub.6) ester or a hydroxylated lower alkyl (C.sub.1 -C.sub.6) ester of such carboxylic acid, or amide forms thereof; E.sup.2 comprises the repeat unit obtained after polymerization of an .alpha.,.beta. ethylenically unsaturated monomer containing a sulfonic acid functionality; R.sup.1 is a hydrogen or a lower (C.sub.1 -C.sub.3) alkyl; R.sup.2 is --CH.sub.2 --O-- or --C(.dbd.O)--O--; R.sup.3 is --?--CH.sub.2 --CH(--CH.sub.2 --OH)--O--!--.sub.n ; n is an integer greater than 1; and R.sup.

Abstract: The invention comprises a method of determining the concentration of a water soluble polymeric treating agent added to wastewater treatment system. The method comprises several steps including dosing the body of water with a predetermined concentration of a treating agent having a fluorescent tag covalently bonded to the treating agent, removing a sample of the water containing the tagged treating agent, analyzing the emissivity of the sample to measure the concentration of the treating agent in the sample and adjusting the concentration of the treating agent accordingly to fit within a predetermined concentration range.

Abstract: The invention comprises a method for dispersing biofilms caused by the growth of slime-forming bacteria and other microorganisms in industrial process water. The method comprises adding an effective biofilm dispersing amount of a linear alkylbenzene sulfonate to the industrial process water which contains slime-forming bacteria and other microorganisms. In addition, an alternative embodiment of the invention comprises adding a compound selected from the group consisting of peracetic acid, glutaraldehyde, isothiazolone, methylene bisthiocyanate, thiocyanomethylthio benzothiazole, 2-bromo-2-nitro-1,3-propane diol, dibromonitrilopropane diol, tetralcishydroxy methyl phosphonium sulfate, decylthioethane amine, alkyl dimethyl benzyl ammonium chloride and combinations thereof.

Abstract: This invention relates to a water-based coating comprising as separate components (A) a grind component comprising in admixture (1) a water compatible overbased alkaline earth alkyl-aryl sulfonate; (2) an organic amine; and (3) an inorganic borate corrosion inhibitor; and (B) a liquid component comprising (1) water; (2) an acrylic emulsion; (3) an organic amine. The coatings are particularly useful for coating ferrous metal surfaces.

Abstract: The invention is a method for removing dissolved oxygen from alkaline water which comprises adding to alkaline water containing dissolved oxygen an effective oxygen-scavenging amount of a water-soluble sulfoxylate. A preferred material is sodium formaldehyde sulfoxylate.

Abstract: The present invention relates to a method for inhibiting the formation and deposition of silica and silicate compounds in water systems by the use an effective amount of a polymer or copolymer having the following structure: ##STR1## wherein A is the initiator radical from free radical polymerization, such as for example, alkoxy, acyloxy, hydroxyl, alkyl or sulfonate radicals from peroxide initiators, or cyanoalkyl radicals from azonitrile initiators, or n-alkythio or tetrahydrofuranyl radicals from common transfer agents, R.sub.1 and R.sub.2 are alkyl groups which contain a combined total of 2 to 4 carbon atoms or R.sub.1 and R.sub.2 together with the nitrogen atom comprise a ring containing 3 to 5 carbon atoms, R.sub.3 is either H or a C.sub.1 through C.sub.

Abstract: The present invention is directed towards the use of a reaction product of an alkynediol and a polyalkylene polyamine to inhibit metal surface corrosion caused by water present in the hydrocarbons in oil pipelines.

Abstract: A polycationic microbicidal and algaecidal agent containing as an active ingredient a polymer comprising repeating units represented by the formula (I) and having a number average molecular weight of at least 1,000, and a microbicidal and algaecidal method using the polymer: ##STR1## (wherein A is a single bond, an oxygen atom, a phenylene group, a dioxyethylene group or a tetramethyldisiloxane group, X.sub.1.sup.- and X.sub.2.sup.- may be the same or different and are counter anions in quaternary salts, p and q may be the same or different and are integers of from 1 to 6, and m is an integer of from 1 to 6, provided that A, X.sub.1.sup.-, X.sub.2.sup.-, p, q and m may be the same or optionally different for every repeating unit).

Abstract: The present invention relates to blends of individual corrosion inhibitors with phosphate esters for protection of ferrous metals against attack by a corrosive environment. These blends are synergistically more effective than each of the individual corrosion inhibitors. The phosphate esters of the present invention are the reaction products of ethoxylated, propoxylated, or butoxylated alcohols or phenols with phosphating agents. Other corrosion inhibitors suitable for blending with the phosphate esters include fatty amines, poly amides, imidazolines, poly imidazolines, quaternary amines, poly quats and dimer, trimer, and polymeric acids. Phosphate esters may comprise any portion of the total amount of corrosion inhibitors in the blend, but the preferred concentration is from about 5 to about 50 weight percent phosphate ester. The corrosion inhibitor blends may be diluted to any concentration with solvents or other fluids as necessary for particular applications.

Abstract: The present invention relates to a specific type of phosphate ester that is as effective or more effective than corrosion inhibitors available in the past. In accordance with the invention, these corrosion inhibitors are highly effective alone or when blended with other specific compounds for protection of ferrous metals against attack by a corrosive environment. More particularly, the inhibitors of the present invention are the reaction products of ethoxylated, propoxylated, or butoxylated alcohols or phenols with phosphating agents.

Abstract: Polyaspartic acid and its salts ms used as a carbon dioxide corrosion inhibitor for ferrous metal surfaces in contact with a substantially acidic corrosive aqueous saline environment. In particular, carbon dioxide corrosion of mild steel in brine substantially free of dissolved oxygen can be effectively inhibited under mild to moderate dynamic flow use conditions by relatively low concentrations of polyaspartic acid.

Abstract: The invention comprises adding bromide to a cooling water system containing corrosion and scale control treatment chemicals at elevated concentrations (40 ppm or greater). A fraction of the recirculating water is drawn off in a side stream and ozonated. Ozone oxidizes bromide to bromine which then serves as a biocide. The bromide levels are chosen such that the ozone/bromide reaction is preferred over the ozone/treatment chemicals reaction. Thus, the addition of bromide at elevated concentrations, while acting as a biocide precursor, serves to protect treatment chemicals necessary for corrosion and scale control.

Abstract: A polymer and method of controlling corrosion and the formation and deposition of scale imparting compounds in water systems is disclosed. The polymer has the general structure: ##STR1## wherein E.sup.1 comprises the repeat unit obtained after polymerization of one or more .alpha., .beta. ethylenically unsaturated monomers, selected from the group consisting of a carboxylic 3acid, lower alkyl (C.sub.1 -C.sub.6) ester or a hydroxylated lower alkyl (C.sub.1 -C.sub.6) ester of such carboxylic acid, and amide forms thereof; E.sup.2 comprises the repeat unit obtained after polymerization of one or more .alpha., .beta. ethylenically unsaturated monomer containing a sulfonic acid functionality; R.sup.1 is a hydrogen or a lower (C.sub.1 -C.sub.3) alkyl; R.sup.2 is --CH.sub.2 -- O--or --C(.dbd.O)--O--; R.sup.3 is --(--CH.sub.2 --CH(--CH.sub.2 --OH)--O--)--.sub.n ; n is an integer greater than 1; and R.sup.

Abstract: A method for inhibiting corrosion of metal surfaces in an aqueous medium, comprising incorporating into the medium a corrosion inhibitor in an amount sufficient to inhibit corrosion, the corrosion inhibitor comprising a water-soluble agent selected from the group consisting of compositions of the formula ##STR1## compositions of the formula ##STR2## and mixtures thereof, wherein R is R.sup.2 .paren open-st.OCH.sub.2 CH.sub.2 .paren close-st..sub.x, wherein R.sup.2 is a substituted or unsubstituted alkyl, aryl, or aralkyl group of from about five to about fifteen carbon atoms, each carbon atom having at least one hydrogen and x is an integer of from about one to about ten, and R'N is a basic nitrogen compound that is at least water-dispersible.