Para-xylene-separation with aluminosilicate X-type zeolite compositions with low LTA-type zeolite
US8431764B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 2012 |
| Grant date | Apr 30, 2013 |
| Priority date | — |
| Expiry date | Mar 22, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J20/2803
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for separating para-xylene from a mixture of C8 alkylaromatics comprises contacting the mixture of C8 alkylaromatics with a zeolitic binder-converted composition comprising (a) a zeolite X composition having at least a first zeolite X having a mean diameter not greater than 2.7 microns, and a second zeolite X, wherein the second zeolite X is obtained by converting a binder material to the second zeolite X and the binder material is in a range from 5 to 50 wt % of the zeolite X composition; and (b) an unconverted binder material content, after conversion to the second zeolite X is complete, in a range from 0 to 3 wt % of the zeolite X composition. The zeolite X composition has an average Si/Al framework mole ratio in a range from 1.0 to 1.5, and a relative LTA intensity not greater than 1.0, as determined by x-ray diffraction (XRD).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.