Modification of Product Distribution

Although the MTG process is an excellent process for gasoline production, it is possible to modify the product distribution to obtain a higher yield of olehns or aromatics. To enhance the production of light olefins, the following strategy has been applied. 

Modification of ZSM-5 zeolites with various compounds is also effective. Kaeding and Butter reported that ZSM-5 modified by treatment with phosphorus compounds showed high (70%) selectivity to Ci — C4 olefin formation from methanol. This could also be ascribed to decrease in stronger acid sites by the treatment. 

Okado et al prepared zeolites with ZSM-5 type structure containing calcium. Though the state of the calcium species is not clear, the zeolites have wetik acidity and give a high selectivity for lower olefins at 773 — 873 K in the methanol conversion. 

Hydrocarbons from Methanol, Marcel Dekker, New York (1983). 

Poustma, Zeolite Chemist and Catalysis (J. A. Rabo, ed.) ACS monograph (7), p. 437, American Chemical Society, Washington, D.C. (1976). 

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Figure 5a. Modification of product distribution of series parallel reaction due to...

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