(1) Once synthetic cryolite
mother liquor was the only taken acid leaching agent, the leaching efficiency of aluminum was not that high.
Column chromatography of the
mother liquor of the acetone extract (MAD) eluted with petroleum ether-ethyl acetate of varying composition gave six fractions -A, B, C, D, E and F.
Eleven amide hydrogen atoms were protected from exchange after three months of soaking the crystals in deuterated
mother liquor at pH 8.2.
Final steps involve evaporation and crystallization under vacuum, separation of crystal from
mother liquor in very large spin dryers, final drying in a stream of warm air and separation into desired size ranges by sieving.
The crystals were separated and the
mother liquor of the above reaction was diluted with the dry ether (50 ml) and it was saturated with dry HCl gas.