公开(公告)号：EP0988356A4

公开(公告)日：2002-08-21

申请号：EP98920370

申请日：1998-05-12

Applicant: EXXONMOBIL OIL CORP

Inventor： BORGHARD WILLIAM S ,  COLLINS NICK A ,  DURAND PAUL P ,  HILBERT TIMOTHY L ,  TREWELLA JEFFREY C

IPC: C10G69/04 ,  C10G29/20 ,  C10G47/16 ,  C10G65/12 ,  C10G69/12 ,  C10G59/02 ,  C10G69/08

CPC classification number: C10G29/205 ,  C10G47/16 ,  C10G65/12 ,  C10G69/123

Abstract: Low sulfur gasoline is produced from an olefinic, cracked, sulfur-containing naphtha by treatment over an acidic catalyst, preferably an intermediate pore size zeolite such as ZSM-5 to crack low octane paraffins and olefins under mild conditions with limited aromatization of olefins and naphthenes. A benzene-rich co-feed is co-processed with the naphtha to reduce the benzene levels in teh co-feed by alkylation. This initial processing step is followed by hydrodesulfurization over a hydrotreating catalyst such as CoMo on alumina. In addition to reducing benzene levels in the combined feeds, the initial treatment over the acidic catalyst removes the olefins which would otherwise be saturated in the hydrodesulfurization, consuming hydrogen and lowering product octane, and converts them to compounds which make a positive contribution to octave. Overall liquid yield is high, typically at least 90 % or higher. Product aromatics are typically increased by no more than 25 wt.% relative to the combined feeds and may be lower than the feed.