Process for para-xylene production from light aliphatics
US7439409B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 2004 |
| Grant date | Oct 21, 2008 |
| Priority date | — |
| Expiry date | Apr 24, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2523/62
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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 C8 iso-olefins and isoparaffins, aromatization of the dimerized C8 product, 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.