Ppg Industries, Inc.

Robert B Simmons

Charles R Wiedrich

David A Stermole

Jonathan G Lasch

Paritosh M Chakrabarti

Richard A Schwarz

Harlan B Johnson

Malcolm Korach

Roger A Crawford

Dennis D Leatherman

Howard H Hoekje

Clifford E Loehr

Linda P Reinhardt

Gordon A Carlson

Leo J Paridon

John M Denison

David M Junker

Described is particulate halogen-containing material, e.g., calcium hypochlorite, containing from about 0.1 to about 10 weight percent of colorant-treated particulate inorganic water soluble salt, e.g., sodium chloride. The colorant used with the sodium chloride salt is resistant to oxidation by the halogen specie in the material and is water dispersible. The amount of colorant used is from about 0.01 to about 5 weight percent, based on the inorganic salt. Preferred are the water dispersible phthalocyanine colorants.

Solid halogen-containing composition and method for producing same

A chemical feeder having a collection reservoir and an erosion reservoir located within and spaced from the wall of the collection reservoir. An elongated cylinder is supported on the collection reservoir and the lower end of the cylinder is located in the collection reservoir. The collection reservoir has a water discharge outlet and the erosion reservoir has a water inlet with a valve to control the flow rate of water into the erosion reservoir. A canister containing solid chemical sanitizing elements is supported in the cylinder and its lower portion is located in the upper portion of the erosion reservoir. Openings are located in the lower end portion of the canister so that solid dry chemical sanitizing elements located in the lower end portion of the canister can be contacted by water in the erosion reservoir to erode and dissolve the solid elements to chemically treat water flowing out of the erosion reservoir into the collection reservoir.

Chemical feed apparatus

An active agent delivery device comprises (a) microporous material comprising a matrix consisting essentially of linear ultrahigh molecular weight polyolefin, a large proportion of finely divided water-insoluble filler of which at least about 50 percent by weight is siliceous, and interconnecting pores; and (b) a releasable active agent or precursor thereof associated with at least a portion of the filler.

Active agent delivery device

A composition of calcium hypochlorite and from about 0.1 to about 3.0 percent by weight water soluble aluminum-containing inorganic salt is provided and can be used to disinfect a water body, e.g., a swimming pool, and enhance the water clarity.

Calcium hypochlorite compositions

Dibasic calcium hypochlorite scale found on the surfaces of process equipment used for the manufacture of calcium hypochlorite is removed chemically by submerging the scale in water, thereby to form an aqueous alkaline solution, and controllably adding hydrochloric acid to the alkaline solution under conditions of agitation and while maintaining the pH of the solution at at least 7, thereby to solubilize the dibasic calcium hypochlorite scale without producing substantial amounts of elemental chlorine.

Method for removing dibasic calcium hypochlorite scale

Dibasic calcium hypochlorite scale present on the surfaces of process equipment, e.g., process vessels, used for the manufacture of neutral calcium hypochlorite is removed chemically by controllably adding chlorine to the process liquor under conditions of agitation while maintaining the pH of the process liquor at at least 7, e.g., from about 7 to about 10.5, thereby to solubilize the dibasic calcium hypochlorite scale without producing substantial amounts of elemental chlorine. In a preferred embodiment, the process liquor in the process equipment containing the dibasic calcium hypochlorite scale is forwarded to a further process vessel containing other less alkaline process liquor to which the chlorine is controllably added. The resulting hydrochloric acid-containing process liquor is recycled to the process equipment containing the dibasic scale and this procedure continued until the desired amount of dibasic calcium hypochlorite scale is solubilized.

Disclosed is a hypochlorite decomposition catalyst of nickel (II) oxide and NiCo.sub.2 O.sub.4 spinel, a hypochlorite destruction process using the catalyst, and a method of synthesizing the catalyst on a porous support.

Method of decomposing hypochlorite ion in a basic solution

Disclosed is a method of vacuum depositing zirconia and magnesia in a porous matrix to form a diaphragm.

Method of preparing a diaphragm having a gel of a hydrous oxide or

Disclosed is a diaphragm having a porous matrix, e.g., a polymeric or asbestos matrix with a layer of magnesium oxide and a hydrous oxide of zirconium therein.

Diaphragm having zirconium and magnesium compounds in a porous matrix

Disclosed is a diaphragm having a porous, hydrophobic fluorocarbon matrix, an intermediate layer or film of a hydrophilic fluorocarbon resin on the surfaces of the matrix, and a hydrous oxide of zirconium contained in the void volumes of the matrix. The layer of the hydrous oxide of zirconium may also contain MgO.

Diaphragm having zirconium oxide and a hydrophilic fluorocarbon resin in

Disclosed is a method of preparing a hydrous zirconium oxide diaphragm by treating a porous matrix with ZrOCl.sub.2 and hydrolyzing the ZrOCl.sub.2 to ZrO.sub.2 with NH.sub.3. The disclosed method contemplates leaching out the NH.sub.4 Cl, dehydrating the substrate, and sequentially building up the ZrO.sub.2.

Method of preparing a diaphragm having a gel of a hydrous oxide of

Disclosed is a bipolar electrolyzer having a plurality of bipolar units space from and parallel to each other with a pair of bipolar units defining a single electrolytic cell therebetween. Each of the bipolar units has an anode on one surface and a cathode on the opposite surface, so that the cathode of one bipolar unit faces the anode of the next adjacent bipolar unit. A steel plate is one exposed surface of the backplate and a silicon sheet in electrical contact with the steel plate is the opposite exposed surface of the backplate. The steel plate and the silicon sheet are bonded together with a suitable electroconductive bonding material.

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Norton, OH, United States of America

Robert B Simmons