Process for removing organic phosphorous compounds and other impurities from dilute sulfuric acid
AssigneeHoechst Aktiengesellschaft
InventorsGerhard Diekhaus, Harald Kappesser
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Abstract
Sulfuric acid which contains dilute organic phosphorus compounds and other impurities and is obtained, for example, during preparation of sulfonated arylphosphines, is purified by extraction with an amine which is sparingly soluble or insoluble in water.
Claims27
A process for removal of sulfonated and unsulfonated organic phosphorus compounds from a starting solution which is a reaction product of sulfonation of aryl phosphines by sulfuric acid, which process comprises extraction of said sulfuric acid with 40 to 90 mol, per mol of the sulfonic acid radicals of said sulfonated organic phosphorus compounds contained in dissolved form in said acid, of a principal amine which is sparingly soluble or insoluble in water.
Dependencies are inferred from the claim text.