Ronald B Weiss

US Patent:

63133628, Nov 6, 2001

Filed:

Dec 17, 1998

Appl. No.:

9/213798

Inventors:

John R. Green - Yardley PA
Thomas F. Degnan - Moorestown NJ
Chaya R. Venkat - Princeton NJ
Ronald A. Weiss - Flemington NJ

Assignee:

ExxonMobil Corporation - Fairfax VA

International Classification:

C07C 264
C07C 600
C07C 700

US Classification:

585323

Abstract:

Akylation product is contacted with a purification medium in a liquid phase pre-reaction step to remove impurities and form a purified stream. The purified stream may then be further processed by liquid phase transalkylation to convert the polyalkylated aromatic compound to a monoalkylated aromatic compound. The process may use a large pore molecular sieve catalyst such as MCM-22 as the purification medium in the pre-reaction step because of its high reactivity for alkylation, strong retention of catalyst poisons and low reactivity for oligomerization under the pre-reactor conditions. Olefins, diolefins, styrene, oxygenated organic compounds, sulfur containing compounds, nitrogen containing compounds and oligomeric compounds are removed.