Effect of Gaseous Alkanes on Conversion of Straight-Run Naphtha in the Presence of Со(Ni) (ZSM-5, MOR, Al2O3)/SO42–/ZrO2 Composite Catalysts

Joint conversion of the propane–butane fraction of gaseous С3–С4 alkanes and straight-run naphtha by involving them in the joint isomerization–disproportionation process on Ме/Н–N–SO42–/ZrO2 composite catalytic systems, where N is MOR or MFI zeolite or Al2O3, was studied at atmospheric pressure in the interval 160–240°С. The catalyst of the composition 0.4Со/HZSM-5/SO42– (2.0)–ZrO2 at 180°С allows up to 63.5% of gaseous C4– alkanes to be involved in isomerization–disproportionation processing of the mixture of straight-run naphtha and propane–butane fraction (1 : 1 by weight), the content of C5–C6 alkanes in the catalyzate to be increased by 21.4%, and the relative content of their branched isomers to be increased to 88.8%. The effect of hydrogen on the conversion of С4– and С8+ components of the mixture of straight-run naphtha and propane–butane fraction (1 : 1 by weight) was studied; an increase in the Н2/hydrocarbon ratio from 2 to 4 leads to an increase in the conversion of С4– alkanes from 63.5 to 90%. The possibility of expanding the resources for producing С5–С6 alkanes with increased content of high-octane branched components by joint processing of the propane–butane fraction and straight-run naphtha was demonstrated.