Process for making xylene isomer using a deheptanizer with a...

Details Process for making xylene isomer using a deheptanizer with a... Process for making xylene isomer using a deheptanizer with a...

2008-05-13

2008-05-13

Dang, Thuan Dinh (Department: 1797)

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By isomerization

C585S477000

Reexamination Certificate

active

11153686

ABSTRACT:
In processes for recovering one or more xylene isomers and isomerizing the remaining isomers for recycle, the isomerate is distilled to provide a toluene-containing overhead, a mid-boiling fraction containing C8aromatics and a bottoms fraction containing C8aromatics and C9+ aromatics. The mid-boiling fraction is recycled to the unit for recovering the sought xylene isomers and has sufficiently low content of C9+ aromatics that the separation feed to the unit for recovering the sought xylene isomers contains up to about 500 ppm-mass C9+ aromatics. The processes provide a high quality xylene isomer product while achieving at least one of debottlenecking, energy savings and capital savings.

REFERENCES:
patent: 3700744 (1972-10-01), Berger et al.
patent: 4697039 (1987-09-01), Schmidt
patent: 6395950 (2002-05-01), Rice
patent: 6472578 (2002-10-01), Rice
patent: 6483002 (2002-11-01), O'Brien
patent: 6540907 (2003-04-01), Towler et al.
patent: 6726835 (2004-04-01), Towler et al.

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