| abstract |
A process for the preparation of para-xylene by toluene and / or benzene methylation with methanol using a dual-function catalyst system. The first catalyst achieves toluene and / or benzene methylation and the second catalyst converts the by-product or unconverted methylating agent of the methylation reaction, improves the yield of the desired product, or achieves a combination thereof. The inclusion of the second catalyst can inhibit the C 1 -C 5 nonaromatic fraction by more than 50% and significantly increase the formation of aromatics. |