C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/106
C01B 17/66 (2006.01)
Patent
CA 1230463
PROCESS FOR PRODUCING HIGH PURITY SOLUTIONS OF ALKALI METAL HYDROSULFITES ABSTRACT OF THE DISCLOSURE High purity solutions of alkali metal hydrosulfites having low concentrations of alkali metal thiosulfates are produced in a process which comprises feeding an alcohol-free aqueous solution of an alkali metal hydrosulfite containing an alkali metal thiosulfate at an impurity to a crystallizing zone. Produced in the crystallizing zone is a slurry of alkali metal hydrosulfite crystals which is conveyed from the crystallizing zone to a separating zone. The separating zone, employing a non-gravitational separation means, recovers a slurry of alkali metal hydrosulfite crystals from a first mother liquor. A portion of the slurry of alkali metal hydrosulfite crystal, is conveyed to a concentrating zone to recover cake of alkali metal hydrosulfite crystals from a second mother liquor. The cake of alkali metal hydrosulfite hydrate crystals is admixed with water in a dissolving zone to produce a purified solution of an alkali metal hydrosulfite having reduced concentrations of said alkali metal thiosulfate as an impurity. The process is operated to minimize the residence time of alkali metal hydrosulfite containing mother liquors in the crystallizing zone and prevent significant decomposition of the crystals of alkali metal hydrosulfite.
501073
Olin Corporation
Osler Hoskin & Harcourt Llp
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