Process for para-xylene production from light aliphatics

Details Process for para-xylene production from light aliphatics Process for para-xylene production from light aliphatics

2004-12-30

2008-10-21

Dang, Thuan Dinh (Department: 1797)

Chemistry of hydrocarbon compounds

Plural serial diverse syntheses

To produce aromatic

C585S418000, C585S419000, C585S654000, C585S734000, C585S251000

Reexamination Certificate

active

07439409

ABSTRACT:
Low-value mixed butanes are processed to obtain a high yield of high-purity para-xylene. Processing steps may comprise fractionation to recover isobutane, dehydrogenation of the isobutane to isobutene, dimerization of the isobutene to obtain C8iso-olefins and isoparaffins, aromatization of the dimerized C8product, and recovery of high-purity para-xylene from the dimerized product by low-intensity crystallization. The availability of isobutane may be increased by isomerization of normal butane. Each of the processing steps may be tailored to the overall objective of high para-xylene yield from a relatively inexpensive feedstock.

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