METHOD OF PRODUCING ISOBUTYLENE BY SKELETAL ISOMERISATION OF N-BUTYLENES AND METHOD OF PRODUCING CATALYST THEREFOR Russian patent published in 2015 - IPC B01J37/06 B01J37/08 B01J29/65 C07C5/27 C07C11/09 

FIELD: chemistry.

SUBSTANCE: according to the present method, the feedstock for the catalyst is modified zeolite ferrierite which is moulded with a binder, said binder being aluminium oxides/hydroxides, with binder content of 15-50 wt % of the catalyst. The zeolite is modified by dealumination, washing with an aqueous acid solution and drying. Dealumination of the zeolite is carried out in an autoclave in the presence of solid anhydrous ammonium hexafluorosilicate of chemical formula (NH₄)₂SiF₆ at 220-400°C for 0.5-10 hours. The weight ratio zeolite/anhydrous ammonium hexafluorosilicate is equal to 7-70. The zeolite is washed with 1-50% acid solution for 15-400 minutes at 20-100°C.

EFFECT: method enables to obtain catalysts with fewer defects in the form of extra-framework aluminium in zeolite channels, and also enables to remove diffusion barriers for passage of butene molecules in catalyst channels.

2 cl, 1 dwg, 1 tbl, 8 ex