Phibro-tech, Inc.

Hugh W Richardson

Gang Zhao

Robert L Hodge

Charles F Jordan

Process for producing a copper-containing aqueous solution, in which a copper mass is dissolved in the presence of air in an aqueous leach liquor containing monoethanolamine and an acid, wherein the amount of acid equivalents is between 0.05 and about 0.7 times the equivalents of monoethanolamine, and wherein the rate of copper dissolution into the aqueous leach liquor is greater than about 4.3 grams of copper per liter of leach liquor per hour until a product having at least about 80 grams per liter is obtaine.

Dissolution of copper metal in aqueous alkanolamine to form copper containing aqueous solution

A method of milling chlorothalonil to form a sub-micron product having a narrow particle size distribution is presented. The milling involves wet milling of the chlorothalonil with high density milling media having a diameter between 0.1 mm and 0.8 mm, preferably between 0.2 mm and 0.7 mm, and a density equal to or greater than 3.8 g/cc, preferably greater than 5.5 g/cc, in a ball mill using between about 40% and 80% loading of the mill volume with milling media, and having the chlorothalonil suspended in an aqueous milling liquid which comprises one or more surface active agents. The milling speed is preferably high, for example from about 1000 rpm to about 4000 rpm. The milled product can be used in foliar applications at a lower effective dosage than prior art formulations, can be used in improved antifouling paint formulations, and can be used in new applications such as the direct injection of solid chlorothalonil particulates in wood to act as a long lasting wood preservative.

Milled submicron chlorothalonil with narrow particle size distribution, and uses thereof

Process for producing a copper-containing aqueous solution, in which a copper mass is dissolved in the presence of an oxidant in an aqueous leach liquor containing monoethanolamine and (HMEA)CO. The leach liquor is produced by partially carbonating the monoethanolamine.

Process for the dissolution of copper metal

Process for producing a copper-containing aqueous solution, in which a copper mass is dissolved in the presence of an oxidant in an aqueous leach liquor containing monoethanolamine and (HMEA) CO . The leach liquor is produced by partially carbonating the monoethanolamine.

Tire mounting alignment pin

Copper etchant solution additives for use with an aqueous alkaline ammoniacal cupric chloride etching bath include several compounds, each of which is shown to stabilize the copper(I) state. The compounds discovered by the present invention include iodide ions such as potassium iodide, ammonium iodide, sodium iodide, calcium iodide and magnesium iodide. Other copper(I) stabilizers discovered by the present invention include certain water soluble salts containing sulfur such as a thiocyanate ion (e.g. ammonium thiocyanate, potassium thiocyanate, sodium thiocyanate, magnesium thiocyanate, and calcium thiocyanate) and a thiosulfate ion (e.g. ammonium thiosulfate, potassium thiosulfate, sodium thiosulfate, magnesium thiosulfate, and calcium thiosulfate). Etching rates for alkaline ammoniacal cupric chloride with different concentrations of potassium iodide, ammonium thiocyanate, and sodium thiosulfate were studied. The results of controlled experiments revealed that adding concentrations up to approximately 1200 mg/L of any one of these compounds to the alkaline ammoniacal cupric chloride etchant resulted in a 20-130% increase in etch rate.

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Sumter, SC, United States of America

Hugh W Richardson