Selective pseudocumene production by xylene methylation
US6156949A · kind A · utility
31Cited by
10References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1998 |
| Grant date | Dec 5, 2000 |
| Priority date | — |
| Expiry date | Dec 28, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2529/40
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
There is provided a process for shape selective xylene methylation that involves contacting a feedstream which includes xylene and methanol under alkylation conditions, with a low activity catalyst. Xylene conversions of at least 15% at methanol utilization levels of 25% or greater are achieved by sequential injection of methanol The xylene methylation process has a selectivity for pseudocumene of over 85% and up to 99%, with a pseudocumene:durene ratio of up to 20 or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.