FIELD: chemistry.
SUBSTANCE: present invention relates to compositions and methods of reducing adverse effect of metallic contaminants on catalytic cracking. An additive for catalytic cracking is described, which contains a combination of: a) material which traps metals, selected from calcium-containing compound, magnesium-containing compound or their combination, a compound similar to hydrotalcite, a compound which contains silicon dioxide and aluminium oxide, mixed metal oxide or their combination; and b) a highly active catalyst, with percentage content of zeolite at least approximately 1.5 times greater and/or total surface area at least approximately 1.5 times greater, and/or total crystallinity at least approximately 1.5 times greater than that of a bulk catalyst, also used in catalytic cracking. Also described is a circulating available amount of catalyst particles in the method of cracking with a fluidised catalyst, where approximately from 2 to 80 wt % of the said available amount makes up the said additive for catalytic cracking. A method is described for catalytic cracking starting material, involving bringing the said starting material, under catalytic cracking conditions, into contact with a composition, which contains a bulk catalyst and the said additive for catalytic cracking. A method is also described for catalytic cracking starting material in the presence of at least one metal with improved operational characteristics of the bulk catalyst, involving bringing into contact with the said additive for catalytic cracking.
EFFECT: increased conversion of the process, at the same time minimising output of byproducts, such as coke and hydrogen.
42 cl, 3 dwg, 5 tbl, 7 ex
