Two-stage reforming process that enhances para-xylene yield and

Details Two-stage reforming process that enhances para-xylene yield and Two-stage reforming process that enhances para-xylene yield and

1995-11-15

1999-09-28

Griffin, Walter D.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Plural serial stages of chemical conversion

208 64, 585321, 585322, C10G 5902, C10G 35085, C10G 3506

Patent

active

059582170

ABSTRACT:
A hydrocarbon feed is reformed to enhance para-xylene yield and to minimize ethylbenzene production. The hydrocarbon feed is subjected to catalytic aromatization at elevated temperatures in the presence of hydrogen, using a non-acidic catalyst having at least one Group VIII metal on a non-acidic zeolite support, to produce a reformate stream containing ethylbenzene and xylenes in which the para-xylene content of the xylene fraction is less than equilibrium. Then, at least some of the reformate is reacted at elevated temperatures in the presence of hydrogen, using an intermediate pore size zeolitic catalyst having a modifier in the absence of a Group VIII metal, to isomerize the non-equilibrium xylene fraction. The modifier can be magnesium, calcium, barium, or phosphorus. At least 20 wt. % of the ethylbenzene in the reformate is converted by hydrodealkylation.

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