HYDRODESULFURIZATION METHOD AND METHOD FOR IMPROVING QUALITY OF HYDROCARBON STOCK Russian patent published in 2002 - IPC

FIELD: petrochemical processes. SUBSTANCE: low-sulfur gasoline is obtained from olefin sulfur-containing cracking ligroin (naphtha) by treatment with acid catalyst, preferably zeolite with middle pore size such as ZSM-5 for cracking of low-octane paraffins and olefins under rather mild conditions at limited aromatization of olefins and naphthenes. Benzene-enriched complex raw material together with ligroin is subjected to alkylation in order to reduce level of benzene. The first stage is followed by hydrodesulfurization using hydrofining catalyst such as CoMo/alumina. EFFECT: reduced sulfur and benzene levels. 10 cl, 5 tbl