Using Heavy Metal Or Compound Thereof Patents (Class 422/19)
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Patent number: 5356548Abstract: Compounds of the formula ##STR1## wherein X is an anion selected from the group consisting of phosphate, borate and molybdate groups, and a method for making these compounds. The compounds are useful in the control of microorganisms in aqueous systems and in the inhibition of corrosion of metal surfaces in contact with aqueous systems.Type: GrantFiled: April 28, 1993Date of Patent: October 18, 1994Assignee: Buckman Laboratories International, Inc.Inventors: John D. Pera, S. Rao Rayudu
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Patent number: 5336499Abstract: A novel molecular scale device is described which is bactericidal, fungicidal, viricidal and algicidal. The anti-pathogenic properties of the device are attributed to electron activity indigenous to diamagnetic semiconducting crystals of tetrasilver tetroxide (Ag.sub.4 O.sub.4) which contains two monovalent and two trivalent silver ions in each molecular crystal. When the crystals are activated with an oxidizing agent, they release electrons equivalent to 6.4.times.10.sup.-19 watts per molecule which in effect electrocute pathogens. A multitude of these devices are effective at such low concentrations as 0.3 PPM used as preservatives in a variety of formulations ranging from cosmetics to pharmaceuticals. Indeed, they are intended as active ingredients for pharmaceuticals formulated to destroy such pathogens as Staphylococcus aureus, and epidermidis, the latter of which it completely destroys in a nutrient broth culture of about 1 million organisms at 0.Type: GrantFiled: November 5, 1992Date of Patent: August 9, 1994Assignee: Antelman Technologies, Ltd.Inventor: Marvin S. Antelman
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Patent number: 5336416Abstract: A method of controlling the growth of bacteria and algae in utilitarian bodies of water such as industrial cooling towers, swimming pools and hot tubs is described. The method includes adding to the water trivalent copper compounds including the periodate and chelate complexes of biuret an tris-(hydroxymethyl) aminomethane. These compounds meet EPA standards of killing 100% of select coliforms within 10 minutes and are efficacious at concentrations as low as 5-9 PPM.Type: GrantFiled: July 12, 1993Date of Patent: August 9, 1994Assignee: N. Jonas & Co., Inc.Inventor: Marvin S. Antelman
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Patent number: 5248438Abstract: The treatment of an aqueous system to inhibit scale formation with a polyepoxysuccinic acid scale inhibitor, an acrylic acid copolymer and a lanthanide ion blending agent.Type: GrantFiled: January 28, 1992Date of Patent: September 28, 1993Assignee: Betz Laboratories, Inc.Inventor: Libardo A. Perez
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Patent number: 5223149Abstract: A method for controlling the growth of bacteria and algae in utilitarian bodies of water such as industrial cooling towers, swimming pools and hot tubs is described. The method comprises adding to the water novel trivalent silver compounds. Said compounds are light stable and can be supplied as liquid concentrates which will not precipitate any silver whatsoever from saline waters nor will the concentrates stain skin or discolor surfaces. Said compounds meet the rigid EPA standards of killing 100% of select coliforms within ten minutes and are efficacious at concentrations as low as 1-2 PPM.Type: GrantFiled: May 18, 1992Date of Patent: June 29, 1993Assignee: N. Jonas & Co., Inc.Inventor: Marvin S. Antelman
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Patent number: 5192447Abstract: A corrosion inhibitor treatment composition for cooling water systems at elevated temperatures in which no chromate is used is disclosed, comprising a combination of a localized corrosion inhibitor in the form of a salt of molybdenum, vanadium, or tungsten, a reduced level of a general corrosion and scale inhibitor comprising zinc, nickel or a combination thereof, orthophosphate, an organic phosphonate, and a stabilizing agent.Type: GrantFiled: July 9, 1991Date of Patent: March 9, 1993Assignee: Nalco Chemical CompanyInventor: Kenneth P. Fivizzani
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Patent number: 5178796Abstract: There is disclosed a method for removing dissolved oxygen from aqueous systems, for example, boiler water systems for oil injection water or brine. The disclosed method uses a salt of a keto-gluconic acid, or a salt of a stereoisomer of a keto-gluconic acid, as the oxygen scavenger a metal containing compound which controls the rate of oxygen removal.Type: GrantFiled: April 2, 1992Date of Patent: January 12, 1993Assignee: Pfizer Inc.Inventors: Herman L. Gewanter, Ralph D. May
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Patent number: 5169563Abstract: A water treatment agent for boilers which comprises as active ingredients a compound which can release aliphatic hydroxycarboxylic acid ions in water and a polyamine represented by the following formula (I) or an acid addition product thereof:H.sub.2 H(CH.sub.2 CH.sub.2 NH).sub.n H (I)(wherein n denotes an integer of 2 to 5), and a water treatment method for pure water boilers or soft boilers using the above active ingredients to prevent corrosion of the ferrous metal in the water system of the pure water boilers or soft water boilers.Type: GrantFiled: November 26, 1991Date of Patent: December 8, 1992Assignee: Katayama Chemical Inc.Inventors: Sakae Katayama, deceased, Sadaoki Kanada, Kazuo Marugame, Hiroshi Asai
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Patent number: 5166074Abstract: A method of detecting the initial concentration of a water-treatment chemical present in a diluted aqueous system, by (1) incorporating into the aqueous system, a mixture including a known amount of the active ingredient and a known amount of an ultra-violet sensitive compound having the formula (I): ##STR1## wherein halogen is chlorine or bromine; X is ##STR2## and a and b, independently are 0 or 1; M is hydrogen or an alkaline metal ion; and (2) detecting the concentration of the compound of formula I, by exposing to ultra-violet light a sample of the aqueous system so treated.Type: GrantFiled: November 7, 1990Date of Patent: November 24, 1992Inventors: Adrian M. Vessey, David S. Ryder
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Patent number: 5158685Abstract: A method inhibiting the deposition of silica and silicate compounds on the metallic surfaces of cooling water equipment comprising adding to the water a composition consisting of hydroxyphosphonoacetic acid and a polymer having the formula: ##STR1## wherein M is a water soluble cation. This composition may further comprise a molybdate compound.Type: GrantFiled: July 12, 1991Date of Patent: October 27, 1992Assignee: Betz Laboratories, Inc.Inventor: Donald T. Freese
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Patent number: 5133933Abstract: The present invention relates to microbiocidal composition and methods for the preparation and use of of such compositions. Properly used in accordance with the present invention, these microbiocidal compositions are effective in killing or inhibiting a wide variety of harmful, destructive or offensive microorganisms including viruses, bacteria, yeasts, algae and molds. The microbiocidal compositions of the present invention are suitable for use with conventional detergents to provide microbiocidal cleansing agents. The microbiocidal compositions can also be mixed with a liquid to provide an effective disinfectant. The microbiocidal additive can be incorporated into plastic materials and various synthetic fibers thereby imparting microbiocidal activity to the plastic materials or fibers.Type: GrantFiled: March 7, 1990Date of Patent: July 28, 1992Assignee: Interface Research CorporationInventor: Robert H. McIntosh
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Patent number: 5130052Abstract: A method of inhibiting corrosion of a metal surface in an aqueous system having a pH of at least 6, comprising maintaining in the aqueous system, in an amount effective to inhibit corrosion, a water-soluble, organic-rare earth metal chelate which is derived from a rare earth metal having an atomic number from 57 to 71 and an organic chelant. The organic chelant provides not only water solubility but surprisingly enhanced corrosion inhibiting activity. The water-soluble, organic-rare earth chelates may be advantageously combined with other corrosion inhibitors such as zinc chelates, organophosphonates, phosphates, chromates, molybdates, and the like.Type: GrantFiled: October 24, 1991Date of Patent: July 14, 1992Assignee: W. R. Grace & Co.-Conn.Inventors: Robert P. Kreh, Vincent R. Kuhn, John Richardson, Robert M. Spotnitz, Charles G. Carter, Vladimir Jovancicevic
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Patent number: 5094814Abstract: A combination product containing (a) dihydroxyacetone, (b) hydroquinone, and (c) a volatile amine that is capable of removing oxygen and neutralizing carbon dioxide in industrial waters, particularly boiler waters, including boiler feed waters, internal boiling waters, condensate waters, and return waters. The combination product preferably contains weight ratios of ingredients (a):(b):(c) ranging from 1:0.01:0.1 to about 1:1:100, and may additionally contain a filming amine.Type: GrantFiled: June 15, 1990Date of Patent: March 10, 1992Assignee: Nalco Chemical CompanyInventors: Cynthia A. Soderquist, Mei-Jan L. Lin
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Patent number: 5089275Abstract: Solid bactericidal compositions are disclosed based on divalent silver (Ag(II)) as the active sanitized agent. The compositions are prepared by reacting acid liquid Ag(II) complexes with anhydrous calcium sulfate so as to form a solid matrix in which the bactericide is entrapped in the resulting hydrated calcium sulfate. Optimum compositions are described consisting of Ag(II) phosphate dissolved in phosphoric acid where the ratio of solid (by weight) to liquid (by volume) is 5:2. The resulting solid bactericides can be used in water cooling installations. They are capable of causing 100% kills within 10 minutes of E. Coli conforms in conformity with EPA protocols, allowing them to quality as swimming pool and hot tub sanitizers. Since the compositions are based on calcium sulfate, they are also suitable as mineralizers, thus providing a dual function.Type: GrantFiled: May 9, 1991Date of Patent: February 18, 1992Assignee: N. Jonas & Co., Inc.Inventor: Marvin S. Antelman
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Patent number: 5082592Abstract: A composition and method for controlling corrosion of steel in aqueous systems such as cooling and boiler systems. The combination of a nonionic surfactant and an anionic oxygen containing group such as one or more alkali metal salts of borate, molybdate and nitrate/nitrite provide improved corrosion inhibition of steel in aqueous systems. The magnetite layers formed in the presence of this combination exhibit decreased porosity and increased corrosion resistance to acidic solutions. This combination also inhibits entry of hydrogen into steel when exposed to acidic solutions thereby inhibiting hydrogen embrittlement. The preferred nonionic surfactant is phenol/polyethylene oxide nonionic surfactant and the preferred alkali metal salt is Na.sub.2 MoO.sub.4.Type: GrantFiled: July 2, 1990Date of Patent: January 21, 1992Assignee: Betz Laboratories, Inc.Inventor: Alexander C. McDonald
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Patent number: 5078902Abstract: Divalent silver halides provide a source for divalent bactericidal silver ions in the presence of persulfate. The halides are especially effective when applied to water used in industrial cooling installations, hot tubs and swimming pools and will conform to stringent EPA requirements for waters utilized for bathing as in tubs and pools of 100% kills of 100 K/cc E. Coli coliforms within 10 minutes, exemplary of which are the chloride and bromide which give 100% kills within 5 minutes. The halides, of course, can be used in salty water since they are solids immune from halide action that would otherwise precipitate soluble divalent silver from solution.Type: GrantFiled: May 9, 1991Date of Patent: January 7, 1992Assignee: N. Jonas & Co., Inc.Inventor: Marvin S. Antelman
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Patent number: 5073382Abstract: Solid alkaline bactericidal compositions are disclosed suitable for compounding alkaline end products such as food and dairy cleaners and surgical scrubbing soaps, formed by the neutralization of acid stabilized inorganic divalent silver complexes and capable of effecting 100% kills upon cultures of anaerobic bacteria colonies of 100K/cc. within 5 minutes.Type: GrantFiled: May 9, 1991Date of Patent: December 17, 1991Assignee: N. Jonas & Co., Inc.Inventor: Marvin S. Antelman
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Patent number: 5068059Abstract: A corrosion inhibitor for aqueous systems containing ferrous and non-ferrous metallic surfaces comprising (a) hydroxyphosphonoacetic acid, or a water soluble salt thereof, and (b) an aminoalkylenephosphonic acid derivative, or a water soluble salt thereof.Type: GrantFiled: January 16, 1990Date of Patent: November 26, 1991Assignee: Drew Chemical CorporationInventors: Winston S. Go, Joseph S. Roti, Mark G. Lang, Charles O. Weiss
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Patent number: 5017295Abstract: A method or methods of controlling the growth of bacteria in the water of swimming pools and/or industrial water supplies by adding to the water a specified concentration of a stable divalent silver compound. The invention has the advantage over chlorination in that it is odorless and non-volatile. It furthermore is superior to monovalent silver compounds as these compounds do not decompose in the presence of light and resist precipitation by halides and form divalent soluble complexes which in the monovalent state are invariably insoluble solids.Type: GrantFiled: May 1, 1990Date of Patent: May 21, 1991Assignee: N. Jonas & Co., Inc.Inventor: Marvin S. Antelman
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Patent number: 5013450Abstract: A method for the purification of fluids such as water, aqueous fluids and liquid fuels, comprises contacting said fluids with a solid material body of a novel alloy which comprises 50 to 60% copper, 20 to 28% zinc, 0.5 to 8% nickel, 0.005 to 2.5% aluminum, 7 to 15% manganese, and 1.3 to 4.5% tin, based on the total weight of the alloy.Type: GrantFiled: January 23, 1990Date of Patent: May 7, 1991Inventor: Luis Gomez
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Patent number: 5000916Abstract: Directed to a new molybdenum carboxylic compound and the use thereof as a corrosion inhibitor of steel and other metals particularly in cooling water.Type: GrantFiled: July 17, 1989Date of Patent: March 19, 1991Assignee: Amax Inc.Inventors: Mark S. Vukasovich, Roger F. Sebenik
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Patent number: 4959155Abstract: There is described a method for the purification of fluids, such as water, aqueous fluids and fuel fluids, which comprises passing said fluids through a chamber usually inserted in the line of the aqueous fluid or the fuel fluid to be treated, within which there is located a solid body of an alloy material, having any suitable shape, preferably an elongated shape, in such a way that the external surfaces of said solid body of an alloy material are contacted with the water, aqueous fluid or fuel fluid flowing within the chamber, said solid body of an alloy material being fabricated from the metals nickel, zinc, aluminum, manganese and tin; and the alloy to carry out the method, made of the above metals.Type: GrantFiled: May 23, 1989Date of Patent: September 25, 1990Inventor: Luis Gomez
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Patent number: 4923767Abstract: A fuel cell powerplant 10 having a flow path 20 for an aqueous solution and a method for operating the powerplant are disclosed. The aqueous solution includes water, iron based compounds, and ferric hydrous oxide of a character that retards the deposition of iron based compounds on the interior of the conduit.Type: GrantFiled: June 24, 1988Date of Patent: May 8, 1990Assignee: International Fuel CellsInventors: Albert P. Grasso, Wolfgang M. Vogel
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Patent number: 4885136Abstract: A method of anticorrosive treatment for soft water boilers to prevent iron family metals from corrosion, especially from pitting corrosion, which is characterized by adding, to a boiler water system using soft water at a high temperature, (a) a specific amount of a phosphorus compound, (b) a specific amount of a carboxylic acid compound and (c) a specific amount of a metal compound.Type: GrantFiled: October 15, 1987Date of Patent: December 5, 1989Assignee: Katayama Chemical Works Co., Ltd.Inventors: Sakae Katayama, Hirohiko Katayama, Toshihiko Mukai, Yoshinari Kawasaki
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Patent number: 4869827Abstract: This invention relates to an improved composition and method which inhibit the corrosion of and the formation of scale on metals present in an aqueous system. The composition comprises a water soluble copolymer having moieties derived from acrylic acid and from lower alkyl hydroxy acrylates, and a combination of a manganese compound and an aminoalkylenephosphonic acid derivative or its salts.Type: GrantFiled: May 18, 1988Date of Patent: September 26, 1989Assignee: The Dow Chemical CompanyInventors: Harold A. Chagnard, Jr., Mark K. Brayden, Thomas R. LeBlanc
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Patent number: 4867944Abstract: A method of inhibiting corrosion in cooling tower systems comprising adding to a cooling tower water containing sulfides, hydrocarbons or mixtures thereof as contaminants a corrosion inhibiting composition containing a water-soluble zinc compound, a water-soluble molybdate, a water-soluble orthophosphate and a water-soluble polyphosphate.Type: GrantFiled: January 13, 1988Date of Patent: September 19, 1989Assignee: Gulf Coast Performance Chemical, Inc.Inventors: Bradley A. Bucher, Jesse H. Jefferies, Harold P. Templet
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Patent number: 4859358Abstract: Thickened aqueous automatic dishwashing detergent compositions containing optional bleach-stable surfactant, detergency builder, hypochlorite bleach (to yield available chlorine), a thickening agent and metal salts of long chain hydroxy fatty acids. The compositions have a yield value between 50 and 350 dynes/cm.sup.2 and inhibit tarnishing of sterling and silver-plated flatware.Type: GrantFiled: June 9, 1988Date of Patent: August 22, 1989Assignee: The Procter & Gamble CompanyInventors: Steven M. Gabriel, Brian J. Roselle
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Patent number: 4835072Abstract: An apparatus, such as a fuel cell powerplant 10 or a boiler 168, having a flow path for an aqueous solution and a method for operating the apparatus are disclosed. The aqueous solution includes water, iron based compounds, and ferric hydrous oxide of a character that retards the deposition of iron based compounds on the interior of the conduit.Type: GrantFiled: June 17, 1985Date of Patent: May 30, 1989Assignee: International Fuel Cells CorporationInventors: Albert P. Grasso, Wolfgang M. Vogel
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Patent number: 4828796Abstract: A method of protecting the internal surface of a pipeline against corrosion resides in introducing into the pipeline a composition comprising 0.01 to 1 part of a phosphate and a silicate. The phosphate can be sodium polyphosphate or monosubstituted potassium phosphate. The silicate can be an alkaline metal silicate or silicon dioxide. The weight ratio of the phosphate to the silicate varies from 9-50:1, respectively, and the composition includes up to 100 parts of water. The composition is formed by fusing the phosphate and the silicate at a temperature of about 800 to 10000 degrees C. and cooling the fused composition until a vitreous structure is formed. The composition is then introduced into a pipeline containing water having a P.sub.2 O.sub.5 concentration of about 0.3 to 3.5 milligrams per liter.Type: GrantFiled: June 9, 1986Date of Patent: May 9, 1989Assignees: Inzhenerny, Tsentr, Po, Selskokhozyaistvenno Vodosnabheniju, I, Truboprovodam, Alma-atinsky, Institut, Inzhenero, Zheleznodorozhnogo Transporta, Institut Khimicheskikh, Nauk, Akademii, Nauk, KazakhskoiInventors: Viktor V. Shishkin, Yaroslav P. Sushkov, Duglas Z. Serazetdinov, Evgeny G. Lukin, Viktoria I. Kapralova, Tamara S. Polyanskaya, Ljubov I. Abramova, Jury P. Shapovalov, Viktor N. Oleinik, Nikolai F. Kryazhevskikh, Alexandr I. Chernyai
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Patent number: 4820423Abstract: A method of preventing corrosion and scale formation on metals exposed to industrial recirculating waters having a pH ranging between about 7.0 to about 9.5, which consists essentially of adding to said industrial recirculating waters an effective amount of a combination of a water-soluble zinc salt, a nitrogen-containing N-alkylated acrylamide zinc complexing polymer and an orthophosphate ion source, wherein:(a) the weight ratio of zinc to nitrogen-containing zinc complexing polymer ranges between 1:1 to about 1:20;(b) the nitrogen-containing N-alkylated acrylamide zinc complexing polymer has a weight average molecular weight ranging between 2,000 to 25,000 and is selected form the group consisting of water-soluble copolymers and terpolymers containing at least two mole percent of an N-alkylated acrylamide monomer, wherein the nitrogen substituted alkyl group contains from 3-12 carbon atoms and wherein the N-alkyl group may be linear or branched.Type: GrantFiled: September 1, 1987Date of Patent: April 11, 1989Assignee: Nalco Chemical CompanyInventors: Guy A. Crucil, Laura J. Blaser
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Patent number: 4804591Abstract: A fuel cell powerplant 10 having a flow path 20 for an aqueous solution includes a device 18 for disposing in the solution ferric hydrous oxide of a character that retards the deposition of iron based compounds. The device is disposed within the powerplant and receives water from a conduit 42 which communicates with a component of the fuel cell powerplant, such as a fuel cell stack 12.Type: GrantFiled: June 18, 1985Date of Patent: February 14, 1989Assignee: International Fuel CellsInventors: Albert P. Grasso, Wolfgang M. Vogel, William A. Taylor
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Patent number: 4801387Abstract: A water soluble polymer composition is disclosed. The polymer has repeat units characterized by the structural formula: ##STR1## 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.3 is a hydroxy substituted alkyl or alkylene radical having from 1 to about 6 carbon atoms or a non-substituted alkyl or alkylene radical having from 1 to 6 carbon atoms; X is an anionic radical; Z is H or hydrogens or a water soluble cation or cations which together counterbalance the valence of X, and a is 0 or 1. The copolymer is effective in inhibiting the precipitation of certain scale forming salts, and also acts to inhibit corrosion of metal parts in contact with water systems.Type: GrantFiled: April 13, 1987Date of Patent: January 31, 1989Assignee: Betz Laboratories, Inc.Inventor: Fu Chen
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Patent number: 4797224Abstract: Water-soluble zinc:polymer complexes of nitrogen-containing polymers are useful in preventing corrosion in aqueous recirculating systems operating within the pH range of 7.0-9.5, when combined with orthophosphate ion sources.Type: GrantFiled: September 2, 1987Date of Patent: January 10, 1989Assignee: Nalco Chemical CompanyInventors: Guy A. Crucil, Laura J. Blaser
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Patent number: 4749550Abstract: A method of inhibiting corrosion of a metal surface in an aqueous system comprising introducing corrosion inhibiting cations into the aqueous system. The corrosion inhibiting cations are selected from the group comprising cations of yttrium and cations of the metals of the lanthanum series which metals have atomic numbers from 57 to 71 inclusive. The cations may be introduced in the form of water soluble salts. Alternatively the cations may be releasably bound by ion exchange to a substrate and the ion-exchanged substrate introduced into the aqueous system.Type: GrantFiled: December 23, 1986Date of Patent: June 7, 1988Assignee: The British Petroleum Company p.l.c.Inventors: Brian P. F. Goldie, John J. McCarroll
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Patent number: 4728452Abstract: The corrosion of metals in closed, aqueous cooling systems having a pH of 7.5 to 10.5 is inhibited by adding to the system a coolant concentrate comprising water, at least 10% by weight of a water soluble nitrite or a mixture of a water soluble nitrite and a water soluble nitrate, 0.2 to 2.0% by weight of at least one water soluble azole, and 0.1 to 1.0% by weight of a water soluble molybdate, to provide in the system concentrations of at least 200 ppm of the nitrite or nitrite/nitrate mixture, 2 to 20 ppm of the azole and 1 to 10 ppm of the molybdate.Type: GrantFiled: January 17, 1986Date of Patent: March 1, 1988Assignee: Pony Industries, Inc.Inventor: Gerald D. Hansen
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Patent number: 4714564Abstract: A multifunctional corrosion inhibitor consisting essentially of an alkali metal borate, an alkali metal nitrate, an alkali metal nitrite, an alkali metal metasilicate, an alkali metal phosphate, mercaptobenzothiazole and at least one selected surfactant.Type: GrantFiled: April 21, 1982Date of Patent: December 22, 1987Assignee: The United States of America as represented by the Secretary of the Air ForceInventors: Charles T. Lynch, Fred W. Vahldiek, Mohammad Khobaib
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Patent number: 4689201Abstract: Corrosion in liquid, especially aqueous systems such as cooling systems, is controlled by the addition of a vegetable tannin or a derivative thereof, a triazole, a hydroxylamine, a neutralizing amine, and a water soluble salt of a Group II metal, in particular zinc, magnesium or calcium.Type: GrantFiled: March 5, 1985Date of Patent: August 25, 1987Assignee: Dearborn Chemicals LimitedInventors: Stuart W. Longworth, John G. Baker
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Patent number: 4686059Abstract: An automobile coolant concentrate comprising (a) a liquid polyhydric alcohol, and (b) a corrosion inhibitor comprising an alkali metal antimony tartrate, preferably with an azole compound, in a corrosion inhibitory amount with respect to corrosion of lead-containing solders.Type: GrantFiled: February 12, 1986Date of Patent: August 11, 1987Assignee: First Brands CorporationInventor: Norman E. Payerle
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Patent number: 4676910Abstract: Concentrated solutions of sodium sulfite and related compounds can be inhibited against sodium sulfate precipitation by substituting potassium for a portion of the sodium contained in such compounds. A typical concentrate would contain a water-soluble sulfite mixture comprising sodium and potassium sulfite with the sodium to potassium ratio ranging between 1:1 to 15:1.Type: GrantFiled: August 11, 1986Date of Patent: June 30, 1987Assignee: Nalco Chemical CompanyInventor: Leonard Dubin
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Patent number: 4668474Abstract: The present invention is directed to a composition and method for inhibiting the corrosion of copper and copper alloy metals in aqueous systems. The composition comprises mercaptobenzothiazole and added ferrous ions in a ratio of 1:1 to 1:10, by weight. The method comprises adding this composition to the aqueous system being treated.Type: GrantFiled: July 22, 1985Date of Patent: May 26, 1987Assignee: Calgon CorporationInventors: Jasbir S. Gill, Richard G. Varsanik
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Patent number: 4663053Abstract: A corrosion inhibition and scale control method and composition are disclosed. The method comprises, adding to a cooling water system, for which protection is desired, a water soluble zinc salt, a water soluble sulfonated styrene/maleic anhydride (SSMA) copolymer and an organo-phosphorus acid compound. A corrosion inhibitor compound such as a 1,2,3-triazole or thiazole compound may be added to afford additional protection. Molybdate salts may also be included as optional corrosion inhibitors. A cellulose gum material and/or water soluble acrylic acid polymer or copolymer may be conjointly used with the SSMA copolymer.Type: GrantFiled: May 3, 1982Date of Patent: May 5, 1987Assignee: Betz Laboratories, Inc.Inventor: Gary E. Geiger
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Patent number: 4659482Abstract: A water soluble polymer composition is disclosed. The polymer has repeat units characterized by the structural formulae: ##STR1## 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.3 is a hydroxy substituted alkyl or alkylene radical having from 1 to about 6 carbon atoms or a non-substituted alkyl or alkylene radical having from 1 to 6 carbon atoms; X is an anionic radical; Z is H or hydrogens or a water soluble cation or cations which together counterbalance the valence of X, and a is 0 or 1. The copolymer is effective in inhibiting the precipitation of certain scale forming salts, and also acts to inhibit corrosion of metal parts in contact with water systems.Type: GrantFiled: May 9, 1986Date of Patent: April 21, 1987Assignee: Betz Laboratories, Inc.Inventor: Fu Chen
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Patent number: 4640818Abstract: The invention is an improved process for inhibiting corrosion of metals in water conducting systems. It comprises employing in combination a compound of manganese together with organic aminoalkylenephosphonic acid derivatives to the water in such systems. These amine derivative compounds may also contain other functional groups, e.g., carboxylates, quaternary amines, hydroxyalkyl groups and the like.Type: GrantFiled: June 13, 1985Date of Patent: February 3, 1987Assignee: The Dow Chemical CompanyInventors: Jeffrey G. Grierson, Carol A. Jones, William D. Spears
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Patent number: 4613481Abstract: The present invention is directed to a composition useful for inhibiting the corrosion of copper and copper alloy metals in an aqueous system comprising mercaptothiazoline and ferrous ions.The present invention is also directed to a method of inhibiting the corrosion of copper and copper alloy metals in an aqueous system comprising maintaining in the aqueous system at least about 1 ppm (parts per million) of mercaptothiazoline, preferably in combination with ferrous ions.Type: GrantFiled: August 16, 1985Date of Patent: September 23, 1986Assignee: Calgon CorporationInventors: Jasbir S. Gill, Arthur J. Friedman
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Patent number: 4606890Abstract: Process for conditioning metal surfaces to inhibit their corrosion and/or to inhibit scale deposition thereon by treating said surfaces:(A) prior to contact with a corrosive or scaling environment, with 2-hydroxy-phosphonoacetic acid or a metal salt thereof and optionally with a metal ion component (b) as hereinafter defined(B) during contact with an aqueous system capable of corroding said metal surfaces or depositing scale thereon, with a combination of:(a) 2-hydroxy-phosphonacetic acid or a water-soluble salt thereof; and(b) a metal ion which enhances, synergistically, the metal conditioning effected, individually, by 2-hydroxy-phosphonoacetic acid and the metal ion.Type: GrantFiled: February 27, 1984Date of Patent: August 19, 1986Assignee: Ciba-Geigy CorporationInventor: Peter R. Fisk
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Patent number: 4584104Abstract: A method of inhibiting amorphous silica scale formation on surfaces in contact with industrial waters containing dissolved silicates is disclosed. The method involves treating the industrial waters with a boron compound which dissolves in or hydrolyzes in these industrial waters to give the orthoborate ion. The preferred boron compound is boric acid, its salts, or precursors.Type: GrantFiled: June 29, 1984Date of Patent: April 22, 1986Assignee: Nalco Chemical CompanyInventor: Leonard Dubin
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Patent number: 4548787Abstract: Compositions for inhibiting mineral scale and the corrosion of metals particularly the cavitation corrosion of aluminum in the presence of aqueous liquids are disclosed. The combination of a water-soluble phosphate with at least one of a water-soluble molybdate, tungstate, or selenate is disclosed as providing a synergistic protective effect against the cavitation corrosion of aluminum in aqueous liquids.Type: GrantFiled: February 9, 1983Date of Patent: October 22, 1985Assignee: BASF Wyandotte CorporationInventors: Joe C. Wilson, Stanley T. Hirozawa, John J. Conville
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Patent number: 4541946Abstract: A corrosion inhibitor composition useful for preventing corrosion by solvents used in treating sour gas streams, comprising a quaternary pyridine salt, a surface-active agent and/or a thio compound and an effective amount of a water soluble nickel compound. The composition can also contain a demulsifier to prevent foaming of the resultant solution.Type: GrantFiled: March 31, 1983Date of Patent: September 17, 1985Assignee: Standard Oil CompanyInventors: Loyd W. Jones, John D. Alkire
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Patent number: 4540494Abstract: A method for removal of oxygen dissolved in water, especially from reservoir drinking water, and for preservation purposes based on hydrazine, having no organic activators and assuring a high reaction velocity with respect to dissolved oxygen within a broad pH-range at low temperature and without a time-dependent reduction of its effectiveness.Cationic and anionic complexes of trivalent cobalt with inorganic ligands, or mixtures thereof, are used as activators. Preferred activators are (Co(NH.sub.3).sub.5 Cl)Cl.sub.2 and Na.sub.3 Co(NO.sub.2).sub.6.Hydrazine solutions with these activators are suitable for the removal of oxygen from gases.Type: GrantFiled: March 10, 1983Date of Patent: September 10, 1985Assignee: VEB Leuna Werke "Walter Ulbricht"Inventors: Wilfried Fuchs, Horst Richter, Vendelin Kaufmann, Wolfgang Renker, Roland Kober
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Patent number: 4529572Abstract: Water soluble zinc copolymer complexes of acrylic acidethylacrylate copolymers are useful in preventing corrosion in aqueous recirculating systems.Type: GrantFiled: September 21, 1984Date of Patent: July 16, 1985Assignee: Nalco Chemical CompanyInventors: John A. Romberger, Laura J. Blaser