PROCESS FOR REMOVING ORGANIC PHOSPHORUS COMPOUNDS AND OTHER IMPURITIES FROM DILUTE SULFURIC ACID

摘要

Frankfurt, 29.11.1991 PAT/rcht-sei Hoe 91/Y010 Hoechst Aktienqesellschaft, Frankfurt am Main 80 of the disclosure 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.