Olin Corporation

Noel N Coe

Walter C Saeman

John P Faust

David F Doonan

Hydrated alkali metal dichloroisocyanurate particles are prepared in a process which comprises, in a first step, spraying droplets of an aqueous slurry of alkali metal dichloroisocyanurate into an evaporation zone fed with a moving stream of heated gas to evaporate water from the droplets and form dry porous solid spherical particles of hydrated sodium dichloroisocyanurate. In a second step, the dry particles are fluidized in a cooling gas until cooled to a temperature below about 50.degree. C. The resulting porous hydrated particles have a uniform distribution of hydration, are dust-free, and quickly dissolve in water.

Hydrated alkali metal dichloroisocyanurate and its production

A coated, rounded, solid calcium hypochlorite granule is described which is comprised of granular calcium hypochlorite encapsulated with a plurality of layers of an inorganic salt other than calcium hypochlorite. The inorganic salt is admixed with sufficient alkaline material to form a coating which has a pH in dilute aqueous solution at ambient temperature of at least about nine or higher. The inorganic salt is selected from a group consisting of the chloride, chlorate, nitrate, bromide, bromate and sulfate of an alkali metal. The alkaline material is selected from the group consisting of calcium hydroxide, strontium hydroxide, barium hydroxide, magnesium hydroxide and mixtures thereof. The inorganic salt coating comprises from about 4 to about 45 percent by weight of the calcium hypochlorite granule. The coated, rounded, solid granule of this invention is highly stable and resists chemical decomposition and dusting during storage.

Granular calcium hypochlorite coated with an inorganic salt

A process is described in which granular calcium hypochlorite particles are encapsulated with a plurality of layers of an inorganic salt other than calcium hypochlorite. In this process granular calcium hypochlorite particles are placed in a moving bed and a portion of the moving bed is lifted to the upper part of a distributing zone and released to fall downwardly through the distributing zone to the moving bed. An aqueous medium of the inorganic salt is sprayed onto the falling particles at a temperature sufficiently high to simultaneously evaporate and remove water from the aqueous medium and to provide a coating of a plurality of layers of inorganic salt in solid form on each calcium hypochlorite particle.

Granular calcium hypochlorite coated with an inorganic salt by spray

A process is described in which granular calcium hypochlorite particles are encapsulated with at least one layer of a hydrated low melting inorganic salt. In this process granular calcium hypochlorite particles are lifted from a moving bed to the upper part of a distribution zone and the lifted particles are released to fall downwardly through the upper portion to the moving bed. A molten hydrated low melting inorganic salt is sprayed onto the falling particles above the moving bed, and the coated particles are cooled to provide at least one solid outer layer of said low melting hydrated inorganic salt.

Granular calcium hypochlorite coated with a low melting inorganic salt

A process is described in which granular calcium hypochlorite particles are encapsulated with at least one layer of a hydrated low melting inorgnaic salt. In this process granular calcium hypochlorite particles are lifted from a moving bed to the upper part of a distribution zone and the lifted particles are released to fall downwardly through the upper portion to the moving bed. A molten hydrated low melting inorganic salt is sprayed onto the falling particles above the moving bed, and the coated particles are cooled to provide at least one solid outer layer of said low melting hydrated inorganic salt.

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West Lake, LA, United States of America

Noel N Coe