PROCESSO PARA A PREPARACAO DE TANINO DE CROMO E SAL DE GLAUBER

A process for the preparation of a chrome-tanning agent and Glauber's salt from sodium bisulphate contaminated with chromium compounds obtained as by-product from the manufacture of chromic acid from solid sodium dichromate and sulphuric acid, comprising (A) TREATING AN ABOUT 20 TO 70% AQUEOUS...

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Bibliographische Detailangaben
Hauptverfasser:	NIEDERPRUM H, BOCKELMANN W, UECKER G
Format:	Patent
Sprache:	por
Schlagworte:	APPARATUS THEREFOR CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING,IMPREGNATING, FINISHING CHEMISTRY COMPOSITIONS FOR TANNING COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM HIDES INORGANIC CHEMISTRY LEATHER METALLURGY PELTS SKINS
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Beschreibung
Zusammenfassung:	A process for the preparation of a chrome-tanning agent and Glauber's salt from sodium bisulphate contaminated with chromium compounds obtained as by-product from the manufacture of chromic acid from solid sodium dichromate and sulphuric acid, comprising (A) TREATING AN ABOUT 20 TO 70% AQUEOUS SODIUM BISULPHATE SOLUTION WHICH CONTAINS CHROMIUM COMPOUNDS AND IS ACID WITH SULPHURIC ACID WITH SULPHUR DIOXIDE UNTIL ALL THE CHROMIUM IS PRESENT IN THE FORM OF CHROMIUM (III); (b) adding sodium hydroxide to the reduced solution until it has a pH of between about 4 and 5; (C) ADDING SODIUM CARBONATE TO THE SOLUTION TO A PH of between approximately 8 and 8.5, thereby precipitating chromium (III) hydroxide; (D) SEPARATING OFF THE PRECIPITATED CHROMIUM (III) hydroxide; and (E) EVAPORATING THE FILTRATE LEFT AFTER REMOVAL OF THE CHROMIUM (III) hydroxide to yield solid sodium sulphate.