CATALYST FOR CONVERSION OF METHANOL TO HYDROCARBONS

摘要

Methods are provided for performing a conversion reaction using a catalyst steamed under mild steaming conditions. Steaming a conversion catalyst under mild steaming conditions can provide an increased conversion activity and/or an increased run length for the catalyst during conversion of an oxygenate feed to aromatic hydrocarbons, such as benzene or xylene. Suitable conversion catalysts can include alumina bound catalysts including a medium pore molecular sieve.

主权项

1. A method of converting a feed to form olefins and aromatics, comprising:
steaming a catalyst in the presence of at least 0.01 atm (1 kPa) of water at a temperature of about 450° F. (about 221° C.) to about 700° F. (about 371° C.) for at least about 0.25 hours to form a steamed catalyst, the catalyst comprising a molecular sieve having at least one 10-member ring channel and having no ring channels larger than a 10-member ring channel; and subsequently exposing a feed comprising at least about 30 wt % of methanol, dimethyl ether, or a combination thereof to the steamed catalyst under effective conversion conditions to form a conversion effluent comprising ethylene, propylene, and at least one aromatic, the effective conversion conditions including a temperature of about 200° C. to about 700° C., the steamed catalyst having a cycle length under the effective conversion conditions that is at least about 15% greater than a cycle length under the effective conversion conditions for the catalyst prior to steaming, and/or the steamed catalyst having an alpha value that is at least about 10 greater than an alpha value for the catalyst prior to steaming.