C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/141, 23/390
C01B 11/06 (2006.01)
Patent
CA 1213415
A CONTINUOUS PROCESS FOR PRODUCING GRANULAR CALCIUM HYPOCHLORITE PARTICLES Abstract of the Disclosure A continuous process for producing granular calcium hypochlorite particles comprises admixing lime and an aqueous liquid in a mixing zone to form a lime slurry. The lime slurry is fed into a crystallizing zone along with a calcium hypochlorite-containing liquid to produce a slurry of coarse dibasic calcium hypo- chlorite crystals and to elutriate a fines slurry from the crystallizing zone. The coarse dibasic calcium hypochlorite crystals are separated from a dibasic hypochlorite mother liquor and fed to a chlorinating zone. Reaction of the coarse dibasic calcium hypo- chlorite crystals with a chlorinating agent is conducted to produce a slurry of hemibasic calcium hypochlorite crystals. The slurry is fed to a separator to separate a hemibasic hypochlorite mother liquor from the hemi- basic calcium hypochlorite crystals. Hemibasic calcium hypochlorite crystals are chlorinated in the presence of an alkali metal hydroxide to produce an aqueous paste of calcium hypochlorite dihydrate which is sprayed into a heated zone to evaporate water and produce granular calcium hypochlorite particles. The novel process of the present invention can employ low grade limes where fine particles including dibasic crystals, insoluble impurities and unreacted lime are removed as a slurry from the crystallizing zone. This slurry is chlorinated to produce a calcium hypochlorite-containing liquid which is returned to the dibasic crystallizing zone. Large crystals of highly pure dibasic calcium hypochlorite are produced as an intermediate product. These dibasic crystals are chlorinated to produce hemibasic calcium hypochlorite crystals as a further intermediate product. Chlorination of the hemibasic crystals yields a slurry -ii- of sufficiently high Ca(OCl)2 assay to meet the specifications for a marketable product. This process eliminates the filtration of calcium hypochlorite dihydrate slurries required in previous commercial processes as well as the need to remove solid sodium chloride.
435318
Arch Chemicals Inc.
Osler Hoskin & Harcourt Llp
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