Ppg Industries Ohio, Inc.

Ppg Industries, Inc.

Axiall Ohio, Inc.

Eagle US 2 LLC

Stanley R Pickens

Richard H Ferguson

Donald W DuBois

Norman R DeLue

Paul T Rice

Timothy A Okel

Malcolm Korach

Bernard A Maloney

Shantilal Mohnot

Fred Abraham

Frank Schiffman

Gerard F Dooley, Jr

Robert B Simmons

Erik A Schoenman

Marilyn D Higgins

Hou-Ching M Yang

Patrick Ryan

Gerald E Moore

A chemical feeder includes a support plate that is positioned within the housing chamber of the chemical feeder is described. The support plate includes a base plate having an upper surface that has one or more extensions that extend upward from the upper surface. The extensions can, with some embodiments, be in the form of arcuate extensions that can together define an impeller pattern or a spiral extension that defines a spiral channel. The upper surface of the base plate and/or the one or more extensions are adapted to support a solid chemical material thereon. The support plate further includes a plurality of arcuate channel apertures or spiral channel apertures that extend through the base plate. A feed liquid introduced into the housing chamber flows through at least one of the plurality of arcuate/spiral channel apertures and contacts the solid chemical material to form a treated liquid.

Chemical feeder

The present invention relates to a chemical feeder that includes a support plate that is positioned within the housing chamber of the chemical feeder. The support plate includes a base plate that has one or more extensions that extend upward from an upper surface of the base plate. The extensions can, with some embodiments, be in the form of peg extensions, arcuate extensions that can together define an impeller pattern, or a spiral extension. The support plate also includes a deflection plate that is positioned vertically above at least one support plate aperture that extends through the base plate. The deflection plate also includes at least one deflection plate hole therethrough. A first portion of liquid passing up through the support plate aperture is horizontally deflected by the deflection plate and interacts with the extensions. A second portion of liquid passing up through the support plate aperture passes vertically up through the deflection plate hole(s). The first and second portions of liquid contact a solid chemical material that is supported above the support plate, so as to form a treated liquid that includes dissolved chemical material.

The present invention relates to a chemical feeder that includes a support plate that is positioned within the housing chamber of the chemical feeder, in which one or more extensions extend upward from an upper surface of the base plate of the support plate. The extensions can, with some embodiments, be in the form of peg extensions, arcuate extensions that can together define an impeller pattern, or a spiral extension. A distributor head having a plurality of distributor head apertures and at least one dome hole extends up through a support plate aperture in the base plate of the support plate, and distributes liquid horizontally and vertically relative to the base plate. The horizontally and vertically distributed liquid contacts a solid chemical material that is supported above the support plate, so as to form a treated liquid that includes dissolved chemical material.

Described are compositions containing a mixture of (a) particulate calcium hypochlorite and (b) an amount of aluminum hydroxide that is sufficient to increase the UN-burn time of the composition by a factor of at least 2.5 compared to that of the calcium hypochlorite, the composition having an available chlorine content of at least 35 weight percent. Further described are solid compositions of (a) granular calcium hypochlorite having a UN Packing Group oxidizer classification of II, and (b) an amount of aluminum hydroxide such that the composition is classified as a Packing Group III Division 5.1 oxidizer or as a non-Division 5.1 oxidizer, the composition having an available chlorine content of at least 40 weight percent. Further described are formed articles prepared from the above-described compositions.

Calcium hypochlorite compositions

Compositions comprising a mixture of (a) a major amount of solid halogen-containing sanitizer material and (b) a minor amount of calcium oxide modified particulate boric acid, the amount of calcium oxide modified particulate boric acid being sufficient to enable the composition to be classified as a class 1 or class 2 NFPA oxidizer are described. Also described is particulate boric acid at least a portion of the particles thereof having on their surface at least a partial coating of calcium oxide, and a method for preparing such coated particulate boric acid.

Halogen-containing sanitizing composition

Describes a composition comprising a mixture of (1) a major amount of calcium hypochlorite, e.g., hydrated calcium hypochlorite, and (2) a minor amount of calcium hypochlorite-compatible hydrophobic additive (other than discrete particulate Group IIA or IIIA metal stearates) in amounts sufficient to provide the composition with reduced hydrophilic properties. The composition has a solution rate in water at standard conditions that is less than the calcium hypochlorite used to prepare the composition, but sufficient for the intended application. Describes also calcium hypochlorite compositions in which the hydrophobic additive is an organo-silicon material, or a metal oxide, e.g., amorphous precipitated silica, treated with a hydrophobizing agent, such as an organo-silicon material, e.g., an organo-silane and/or organo-siloxane material.

Calcium hypochlorite composition

Calcium hypochlorite compositions that are classified as a Packing Group III Division 5.1 oxidizer material or as a non-Division 5.1 oxidizer material are described. In one embodiment, the compositions comprise an admixture of particulate calcium hypochlorite and particulate metaboric acid. The calcium hypochlorite is present in the composition in an amount and is of a concentration such that the composition would be classified as a Packing Group II Division 5.1 oxidizer in the absence of said particulate metaboric acid. Other embodiments described are solid shaped articles, e.g., tablets, comprising the described calcium hypochlorite-metaboric acid composition.

Describes a composition comprising a mixture of calcium hypochlorite and hydrated magnesium sulfate having an average of from 3 to 5.5 moles of water of hydration per mole of magnesium sulfate. The amount of hydrated magnesium sulfate in the composition is such that the composition has at least a DOT Packing Group III Division 5.1 Classification.

An apparatus for dissolving and delivering a solution of a solid chemical material, such as calcium hypochlorite, is described. The apparatus includes in combination: a container, a lid removably mounted on the upper end of the container, and a housing. In operation, the lid is mounted on the container, which contains solid chemical material, and both are inverted and placed on top of the housing. A nozzle within the housing extends through a hole in the lid into the internal space of the container such that dissolving fluid is charged into the container through the nozzle where it contacts the solid chemical material. A solution of chemical material is formed within the container and the solution drains through additional holes formed in the lid and is removed from the housing to a point of use.

Describes a chemical feeder that supplies treating agents, e.g., calcium hypochlorite, to a liquid stream, e.g., an aqueous stream. The chemical feeder is operated in a substantially flooded condition to provide a useful and safe pressure feeder, and optionally uses cyclonic flow to be relatively self-cleaning. One or more tablet canisters are utilized within the substantially flooded interior of the chemical feeder, and expose the lowermost tablets to the turbulent flow outside of the tablet canister. A substantially uniform chemical distribution rate over tablet life is provided by the chemical feeder.

Describes a method for dissolving a solid chemical material, such as calcium hypochlorite, with a solvating liquid, e.g., water, in a chemical feeder operating under positive pressure wherein an inert gas, e.g., air, is injected into the solvating liquid, e.g., by use of an injector nozzle, and the resultant mixture of inert gas and solvating liquid is forwarded to the chemical feeder. Sufficient air is charged to the chemical feeder to limit the level of solvating liquid in the feeder and thereby limit the amount of solid chemical material contacted by the solvating liquid.

Method of operating a chemical feeder

A chemical feeder that produces a solution of a chemical treating agent, e.g., calcium hypochlorite, is described. The chemical feeder comprises a housing (,) having a base (,), side wall (,) extending upwardly from the base, and a closed upper end (,), all of which define a cavity (,). An elongated substantially vertical hollow container (,) is centrally located within the cavity. The bottom of the side wall (,) of the container is adjacent to the base, and contains a plurality of perforations,in the lower portion of the side wall, which is spaced from the inside side wall of the housing. At least one hollow canister (,) having a plurality of perforations (,) in its base and the lower portion of its side wall is interposed, e.g., slidably received, within the container. Conduits for delivering liquid (,) in which the chemical treating agent is soluble to a chamber (,) below the perforations in the canister and for removing a liquid stream (,) containing the chemical treating agent from the feeder are also provided.

Describes a chemical feeder for supplying chemical treating agents, e.g., calcium hypochlorite, to a liquid stream, e.g., an aqueous stream. The chemical feeder includes (a) a housing 11 having a chamber 12 therein for receiving solid chemical material, and a single principal opening 33 in the base 87 of the housing, (b) a valve casing 42 positioned below housing 11 and having a single first opening 36, a single second opening 39, a valve chamber 90 that provides fluid communication between openings 36 and 39, and a valve body 57 that is moveable within valve chamber 90 for selectively regulating the flow of fluid between openings 36 and 39, and (c) a fluid conduit 69 positioned below valve casing 42 and having a fluid inlet 72, a fluid outlet 75 and a feeder opening 84. First opening 36 of valve casing 42 is in fluid communication with opening 33 in base 87 of housing 11, and feeder opening 84 of fluid conduit 69 is in fluid communication with second opening 39 of valve casing 42. Fluid both enters and leaves chamber 12 through principal opening 33 in base 87 of housing 11.

A method of controlling the amount of conductivity increasing substances, e.g., free available halogen, in particular free available chlorine, present in an aqueous medium is described. In accordance with the method of the present invention, an aqueous medium is provided and its conductivity determined. A source of at least one conductivity increasing substance is introduced controllably into the aqueous medium, and a second conductivity measurement is made. The determined conductivities are compared, and in response to this comparison, the amount of conductivity increasing substance added to the aqueous medium is adjusted. In a preferred embodiment of the present invention, the aqueous medium is an aqueous stream, and the source of conductivity increasing substance is calcium hypochlorite, which is introduced into the aqueous stream through the use of a feeder unit, i.e., a chlorination unit.

Method of controlling the amount of sanitizing agent in an aqueous medium

Describes apparatus for dispensing a sanitizing chemical into a swimming pool. The apparatus is a container having a closed bottom, a lid with a dispensing opening, and a plate with colored markings that is larger than the dispensing opening and freely moveable vertically resting on the bottom of the container. The plate has a specific gravity of less than 1.0. In operation, the container is filled with solid sanitizing chemical, e.g., calcium hypochlorite, and placed in a skimmer basket associated with the pool. When the sanitizing chemical is completely dissolved by water pumped through the skimmer basket and recycled to the pool, the plate floats to the top of the container where it can be observed readily to indicate that the apparatus needs to be refilled with sanitizing chemical.

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Monroeville, PA, United States of America

Stanley R Pickens