Process for the preparation of dihydroxyaluminium sodium carbonate

Abstract

Abstract 1. Process for the preparation of dihydroxyaluminium sodium carbonate by reacting aqueous sodium aluminate solutions with carbon dioxide and subsequent separation and drying of the reaction product, characterized in that at a reaction temperature between 20 and 35 degrees C carbon dioxide is initially introduced into water up to saturation, then whilst maintaining the reaction temperature accompanied by further carbon dioxide introduction, aqueous sodium aluminate solution with a Na2 O/Al2 O3 molar ratio of 1 : 1 to 1.25 : 1 is continuously added, in such a way that the pH-value during precipitation in the suspension always remains below 9.8 and preferably between 9.8 and 8.8 and finally, after pH-value setting with carbon dioxide to 7 to 7.5, the precipitation product is separated from the suspension and dried at elevated temperature.

Inventors

• 👤 Ernst Dr. Dipl.-Chem. Urmann
• 👤 Hartmut Dr. Dipl.-Chem. Grund
• 👤 Günter Dr. Dipl.-Chem. Drautzburg
• 👤 Klaus Dr. Dipl.-Chem. Schanz

Bibliographic Details