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31.2 g (0.4 mol) of Al(OH)3 hydrargillite and 378 g of glacial acetic acid are initially introduced into a 750 ml sulfonation flask provided with a stirrer, a thermometer and a reflux condenser. The mixture is refluxed for 24 hours. After this time, the reaction product is cooled and filtered off and is 4 times suspended with, in each case, 50 ml of isopropanol and filtered off. The product is then dried in a vacuum cabinet at 130° C. 61.2 g (94.5% of theory) of acicular aluminium monohydroxide diacetate result.

1. customprovided with a stirrer
2. temperatureThe mixture is refluxed for 24 hours
3. temperatureAfter this time, the reaction product is cooled
4. filtrationfiltered off
5. filtrationfiltered off
6. customThe product is then dried in a vacuum cabinet at 130° C