Process for producing one- and two-ring aromatics from polynuclear aromatic feedstocks

Abstract

Abstract In a process for upgrading a topped-tar fraction of coal tar, topped-tar feedstock containing largely polynuclear aromatic hydrocarbons is hydrocracked in a hydrogen atmosphere in a first reaction zone at a temperature and pressure sufficient to hydrocrack the large molecules to three- and two-ring aromaticnaphthenes. The hydrocracked feed which also contains olefins, is catalytically hydrotreated in a second reaction zone to saturate the olefins, and the feed is then catalytically treated in a third reaction zone at a temperature, pressure and hydrogen to hydrocarbon feed mol ratio sufficient to hydrocrack the threeand two-ring compounds to two- and one-ring aromatics, while, at the same time, naphthenes are dehydrogenated to aromatics, the alkyl aromatics are hydrodealkylated to nonsubstituted aromatic compounds, and substantially all oxygen, nitrogen and sulfur compounds unreacted in the first and second treatment zones are hydrorefined.

Inventors

• 👤 Mehmet Orhan Tarhan

Bibliographic Details