April 9, 2012

CAS databases provide millions of journal article references from more than 10,000 major scientific journals worldwide, patent and patent family references from 63 patent authorities around the world, and other reputable web sources.

The following patent record is from the CAplusSM database.


Patent Number: US 8138384
Title: Two-step manufacture of alkylaromatic hydrocarbons from methane by aromatization followed by alkylation
Inventor(s): Iaccino, Larry L.; Stavens, Elizabeth L.; Mohr, Gary D.; Vincent, Matthew J.
Patent Assignee(s): Exxonmobil Chemical Patents Inc., USA
Source: PCT Int. Appl., 45 pp. CODEN: PIXXD2
Language: English

Methane and natural gas feedstocks are converted in two steps to alkylated aromatic hydrocarbons by: (1) conversion of the methane-containing feedstock with a dehydrocyclization catalyst to aromatic hydrocarbons and hydrogen, followed by (2) alkylation of the aromatic hydrocarbons with an alkylating agent. Dehydrocyclization is carried out under non-oxidizing conditions, in the presence of H2, H2O, CO, or CO2 (e.g., for improving catalyst activity and stability), at 400-1200 degree C (preferably 600-950 degree C), 1-1000 kPa, and weight space velocity <1000 h-1. The dehydrocyclization catalyst can be chosen from Mo, W, and Re supported on ZSM-5 zeolite, SiO2, or Al2O3; suitable alkylating agents include ethylene, synthesis gas (e.g., in a Fischer-Tropsch process), MeOH, or di-Me ether.  The alkylation catalyst can also include a selectively activated component (e.g., the zeolite) to improve the selectivity to alkylation of the aromatic hydrocarbon at a specific position (e.g., p-selectivity for production of p-xylene). The catalyst component is selectively activated by reaction with a silane or by treating the component with a phosphorus or magnesium or metal oxide treating agent.

Please note:  Abstracts and titles for patent records in CAplus are routinely enhanced to better describe the claimed invention. In this example, CAS enhanced the abstract and title using additional information found in the patent. The title of the U.S. granted patent is Production of alkylated aromatic hydrocarbons from methane.


View the full-text U.S. patent from USPTO.

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