Institut Francais Du Pe'trole

Marc Reymond

Vincent Coupard

Fabio Alario

Julia Magne-Drisch

Jean-Fran&ccedil;ois Joly

G&eacute;rard Miquel

A process for isomerising a feed comprising aromatic compounds containing 8 carbon atoms is carried out in two steps: an isomerisation step and a dehydrogenation step. In FIG.,the feed to be treated is introduced into isomerisation zone R,via line,Substantially pure hydrogen is introduced into line,via line,and recycled hydrogen is introduced into line,via line,Hydrogen which circulates in line,is purged via line,The effluent from isomerisation zone R,is sent to a separation zone S,via line,In S,hydrogen contained in the effluent is isolated and recycled to the inlet to isomerisation zone R,via line,the remaining effluent being evacuated from this separation zone S,via line,The fluid contained in line,is heated in an oven F,then evacuated therefrom via line,The effluent leaving the oven is enriched in recycled hydrogen via line,then it is introduced into dehydrogenation zone R,The effluent from zone R,is sent via line,to separation zone S,In S,hydrogen contained in the effluent is isolated and recycled to the inlet to dehydrogenation zone R,via line,the remainder of the effluent being evacuated from separation zone S,via line,Hydrogen which circulates in line,is purged via line

Process for isomerizing and dehydrogenating aromatic compounds containing eight carbon atoms with different catalysts

For isomerising aromatic compounds containing eight carbon atoms in the presence of hydrogen, a mixture containing compounds with a boiling point of about 80&deg; C. to 135&deg; C. comprising at least one paraffin containing eight carbon atoms, at least one naphthene containing eight carbon atoms, at least benzene and at least toluene is added to the feed before introducing it into the isomerisation reactor R via line,These additions are made by a recycle via line,or by adding fresh compounds via line,or be a combination of fresh and recycled compounds via lines,and,Hydrogen is added via line

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Meyzieux, France

Marc Reymond