METHOD OF PRODUCING SYNTHETIC GRANULAR TYPE A ZEOLITES Russian patent published in 2014 - IPC C01B39/18 

FIELD: chemistry.

SUBSTANCE: method of producing zeolite NaA involves hydrothermal crystallisation of pre-moulded and thermally activated granules in an alkali solution with ratio of liquid phase to solid phase of 3 or 4, followed by threefold washing and drying at 370-400°C. The crystallised granules are prepared from a mixture containing natural kaolin, wood flour and calcined kaolin. After the threefold washing step, the granules can be modified with Ca²⁺ or K⁺ cations.

EFFECT: obtaining synthetic granular type A zeolites, which are used for drying various media and sorption and carbon dioxide and hydrogen sulphide.

6 cl, 1 tbl, 7 ex