Nalco Holding Company

About: Nalco Holding Company is a based out in . It is known for research contribution in the topics: Corrosion & Aqueous solution. The organization has 2375 authors who have published 3056 publications receiving 51473 citations.

Chemical formulation and combined process for inhibiting deposition and corrosion in cooling water and gypsum scaling in flue gas desulfurization scrubber systems

Abstract: An inhibitor formulation for inhibiting corrosion and deposition of calcium phosphate, calcium carbonate, and silt in a cooling water system and calcium sulphate (gypsum) scaling in a flue gas desulfurization system. The inhibitor formulation comprises polyacrylate, polymaleic anhydride, and phosphonate in a active weight ratio range between about 1 to 40:1 to 40:0.1 to 15, respectively. The inhibitor formulation is employed to inhibit corrosion and scaling in a combined cooling water/flue gas desulfurization process wherein at least a portion of cooling water blowdown is supplied to make up at least a portion of reagent makeup and/or mist eliminator wash water in the flue gas desulfurization system.

Automotive cleaner plus inhibitor

Abstract: A cleaner-inhibitor and method of incorporating same into an automotive or diesel coolant system consisting of 2-4 fluid ounces per gallon of a cleaner whose basic components are: A. an aminopolycarboxylic acid B. an α hydroxy acid such as gluconic, tartaric, or citric C. an azole copper protector such as mercaptobenzothiazole (MBT) and a monoaryl triazole such as benzotriazole or tolyltriazole Wherein the ratio of A:B:C is about 3:1:1 to 2:1:1. A, b, and C above constitute a Deposit Release Agent in the cleaner. The cleaner above is combined with an inhibitor which is a multi-component inhibiting composition of the boron-nitrite type containing an alkali metal silicate and which may include a copper inhibitor and a polymeric dispersant, which is a water-soluble carboxylic acid polymer such as styrene maleic anhydride copolymer, a polyacrylate or methacrylate copolymer or carboxymethyl cellulose. The cleaner-inhibitor is adjusted with caustic to give a pH in the range 7.5-12.6 and preferably 7.5-10.6 either by premix or directly to the coolant system. An aqueous concentrate is preferred for both the cleaner portion and the inhibitor portion. In an aqueous concentrate of the cleaner the amount of Deposit Release Agent varies from about 85-15%, with a more preferred range being an aqueous concentrate which contains from 50-15% by weight of the Deposit Release Agent. In the inhibitor portion the aqueous concentrate contains 75-85% water and the balance active ingredients. The cleaner is used in a dosage of about 4 ounces per gallon of coolant fluid and is combined with about 4 ounces per gallon of the multi-component corrosion inhibitor utilized above. In some instances under favorable conditions, the amount of the cleaner and inhibitor portions of the cleaner-inhibitor composition may each be reduced to 2 ounces per gallon of coolant.

Thiomonas bhubaneswarensis sp. nov., an obligately mixotrophic, moderately thermophilic, thiosulfate-oxidizing bacterium.

Abstract: A novel aerobic, obligately mixotrophic, moderately thermophilic, thiosulfate-oxidizing bacterium, S10T, was isolated from hot-spring sediment samples collected from Atri, Bhubaneswar, India. The cells of this isolate stained Gram-negative and were strictly aerobic, non-sporulating, rod-shaped and motile with a single polar flagellum. Strain S10T was positive for oxidase and catalase activities. It was capable of utilizing thiosulfate under mixotrophic growth conditions. Mixotrophic growth was observed at pH 6.0-8.5 and 25-45 degrees C; optimum growth occurred at pH 7.5-8.0 and 30-37 degrees C. The major cellular fatty acids were C12:0 3-OH, C16:1omega7c, C16:0, C17:0 cyclo, C18:1omega7c and C19:0 cyclo omega8c. The DNA G+C content of strain S10T was 64.8 mol%. 16S rRNA gene sequence analysis indicated that the bacterium clustered within the radiation of the genus Thiomonas and showed 98.0% similarity with Thiomonas perometabolis ATCC 23370T and Thiomonas intermedia ATCC 15466T. However, DNA-DNA reassociation values of strain S10T with Thiomonas perometabolis JCM 20426T and Thiomonas intermedia JCM 20425T, its nearest phylogenetic relatives, were 46 and 39%, respectively. On the basis of phenotypic, physiological and chemotaxonomic properties, 16S rRNA gene sequence analysis and DNA-DNA reassociation studies, it is proposed that strain S10T represents a novel species of the genus Thiomonas, Thiomonas bhubaneswarensis sp. nov.; the type strain is S10T (=DSM 18181T=JCM 14806T).

Synergistic biocide of 2-(thiocyanomethylthio) benzothiazole with a mixture of 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one

Abstract: The combination of biocides, A. 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one; and B. 2-(thiocyanomethylthio)-benzothiazole provide a synergistic material for controlling microorganisms in industrial process waters.

Measurement and control of sessile and planktonic microbiological activity in industrial water systems

Abstract: A method for monitoring both the planktonic and sessile microbial populations in an industrial water system by the addition of a fluorogenic dye compound is described and claimed. Figure (1) shows a plot of Relative Intensity vs. Wavelength, in nanometers (nm), for a cooling tower water sample.