CATALYST FOR HYDRODEALKYLATION OF ALKYLAROMATIC HYDROCARBONS Russian patent published in 2007 - IPC B01J23/26 B01J23/04 B01J21/02 C07C4/18 

FIELD: petrochemical processes catalysts.

SUBSTANCE: invention relates to production of catalysts used in hydrocarbon feed processing and can be, in particular, used in the hydrodealkylation of toluene and benzene-toluene-xylene fraction isolated from pyrocondensate resulting from hydrocarbon pyrolysis. Alumina-supported catalyst contains 16-20% chromium oxide, 0.3-1.5% sodium oxide, 0.5-3.0 boron oxide. Preparation of alumina comprises adding fine aluminum hydroxide powder to aluminum hydroxide in the form of "wet cake" in amount 15-50% of the weight of "wet cake" in presence of organic acid. As a result, process of hydrodealkylation of real feed material (industrial benzene-toluene-xylene fraction) is stabilized under conditions of temperature gradient throughout the catalyst bed, while high catalytic activity and selectivity are preserved. Simultaneously, coking resistance of the catalyst is enhanced, porous structure thereof shows improvement (increased percentage of wide pores), mechanical strength is increased, and specific surface optimized.

EFFECT: enlarged assortment of high-efficiency hydrodealkylation catalysts.

2 dwg, 4 tbl, 6 ex