Alkali metal hydrosulfite solutions
AssigneeOlin Corporation
InventorsRoger E. Bolick, II, Jimmy M. French
Life of this patent
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Abstract
An aqueous solution comprising alkali metal hydrosulfite and hydroxide ions in an amount to provide a residual alkalinity of at least 0.25 moles per liter results in the decomposition of thiosulfate ions present and inhibits their formation during storage. These solutions can be used, for example, in the bleaching of mechanical pulp.
Claims8
An aqueous solution comprising sodium hydrosulfite or potassium hydrosulfite, hydroxide ions in an amount to provide a residual alkalinity of at least 0.25 moles per liter and containing from about 0.02 to about 0.5 moles per liter of lithium ions.
A process for treating an aqueous solution of sodium hydrosulfite or potassium hydrosulfite containing thiosulfate ions which comprises admixing a source of hydroxide ions to provide a residual alkalinity of at least 0.25 moles per liter and from about 0.02 to about 0.5 moles per liter of lithium ion.
Dependencies are inferred from the claim text.