Exxonmobil Chemical Patents Inc.

Exxonmobil Technology and Engineering Company

Umar Aslam

Wenyih Frank Lai

Doron Levin

Hsu Chiang

Tan-Jen Chen

Seth McConkie Washburn

Seth M Washburn

This disclosure provides improved processes for converting benzene/toluene via methylation with methanol/dimethyl ether for producing, e.g., p-xylene. In an embodiment, a process utilizes a methylation catalyst system comprising a molecular sieve catalyst and an auxiliary catalyst. The auxiliary catalyst comprises a metal element selected from Group 2, Group 3, the lanthanide series, the actinide series, and mixtures and combinations thereof. The auxiliary catalyst may comprise the oxide of the metal element. Deactivation of the molecular sieve catalyst can be reduced with the inclusion of the auxiliary catalyst in the methylation catalyst system.

Processes for converting benzene and/or toluene via methylation

This disclosure provides improved processes for converting aromatic hydrocarbons, such as benzene/toluene, alkylation, transalkylation, or isomerization. In an embodiment, a process comprises utilizing a passivated reactor to reduce deactivation of a molecular sieve catalyst. Additional measures such as the use of an auxiliary catalyst and/or an elevated reactor pressure may be used to further reduce deactivation of the molecular sieve catalyst.

Processes for converting aromatic hydrocarbons using passivated reactor

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Houston, TX, United States of America

Umar Aslam