Process of manufacturing para-xylene

Details Process of manufacturing para-xylene Process of manufacturing para-xylene

2009-10-22

2011-11-01

Griffin, Walter (Department: 1774)

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Including plural reaction stages

C422S187000, C422S630000, C585S319000, C585S322000, C585S323000, C585S805000, C208S061000

Reexamination Certificate

active

08048388

ABSTRACT:
This disclosure relates to a process of manufacturing para-xylene, comprising (a) contacting a pygas feedstock and methylating agent with a catalyst under reaction conditions to produce a product having para-xylene, wherein the product has higher para-xylene content than the para-xylene content of the pygas feedstock; and (b) separating the para-xylene from the product of the step (a), wherein the catalyst comprises a molecular sieve having a Diffusion Parameter for 2,2-dimethylbutane of about 0.1-15 sec−1when measured at a temperature of 120° C. and a 2,2-dimethylbutane pressure of 8 kPa-a and the pygas comprises from about 1 to about 65 wt % benzene and from about 5 to 35 wt % toluene.

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Yashima et al., “Alkylation on Synthetic Zeolites, I. Alkylation of Toluene with Methanol”, Journal of Catalysis, 16, (1970), pp. 273-280.

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