Center ring hydrogenation and hydrocracking of polynuclear...

Details Center ring hydrogenation and hydrocracking of polynuclear... Center ring hydrogenation and hydrocracking of polynuclear...

C - Chemistry, Metallurgy

10

G

196/85

C10G 65/12 (2006.01) C10G 45/44 (2006.01)

Patent

CA 1191806

ABSTRACT Polynuclear aromatic compounds obtained from petroleum residua and coal liquids and containing three to six aromatic ring compounds are first catalytically hydrogenated and then hydrocracked, either thermally or catalytically, to produce high yields of two-ring and mononuclear aromatic products. Useful hydrogenation reaction conditions are 300-900°F temperature, and 1000-1800 psig hydrogen partial pressure. The hydrogenation catalyst used can be nickel-tungsten on a silica-alumina support. The hydrogenated material is then hydrocracked at conditions of 800-1300°F temperature, and 500-3000 psig hydrogen partial pressure. The hydrocracking step may use a catalyst comprising cobalt-molybdenum on alumina and space velocity of 3 - 7 gm/hr/gm catalyst. A preferred feedstock is steam-cracker pyrolysis tar such as produced from steam cracking of ethylene.

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