Transalkylation of Heavy Aromatic Hydrocarbon Feedstocks

摘要

A process for producing xylene comprises contacting a first feed comprising C9+ aromatic hydrocarbons and hydrogen with a first catalyst composition comprising a first molecular sieve having a Constraint Index of 3 to 12 and at least one hydrogenation component. The first catalyst composition dealkylates at least part of the C9+ aromatic hydrocarbons containing C2+ alkyl groups and to saturate the resulting C2+ olefins to produce a second feed. The second feed is then contacted with a second catalyst composition under conditions effective to transalkylate at least part of the C9+ aromatic hydrocarbons in the second feed to produce a product comprising xylene. The second catalyst composition comprises a second molecular sieve having a Constraint Index less than 3 and a third molecular sieve having a Constraint Index of 3 to 12.

主权项

1. A process for producing xylene from C9+ aromatic hydrocarbons, the process comprising:
(a) contacting a first feed comprising C9+ aromatic hydrocarbons and hydrogen with a first catalyst composition under conditions effective to dealkylate at least part of the C9+ aromatic hydrocarbons containing C2+ alkyl groups and to saturate the resulting C2+ olefins to produce a second feed, wherein the first catalyst composition comprises a first molecular sieve having a Constraint Index of 3 to 12 and at least one hydrogenation component; and (b) contacting the second feed with a second catalyst composition under conditions effective to transalkylate at least part of the C9+ aromatic hydrocarbons in the second feed to produce a first product comprising xylene, wherein the second catalyst composition comprises a second molecular sieve having a Constraint Index less than 3 and a third molecular sieve having a Constraint Index of 3 to 12.