Appeal No. 2004-2118 Page 3
Application 09/329,502
reaction zone and a molecular sieve catalyst having an average
pore size less than the average pore size of the catalyst used in
the transalkylation zone in an alkylation zone. An understanding
of the invention can be derived from a reading of exemplary
claim 1, which is reproduced below.
1. In the alkylation and transalkylation of
polyalkylated aromatic compounds, a process comprising:
(a) providing a transalkylation reaction zone
containing a transalkylation catalyst comprising a high
porosity zeolite-Y molecular sieve having a silica/alumina
ratio within the range of 2-5, a pore size greater than 7
and up to about 8 Angstroms, and a surface area of no more
than 500 m2/g;
(b) supplying a polyalkylated aromatic component
comprising polyalkyl benzenes in which the predominant alkyl
substituents contain from 2 to 4 carbon atoms to said
transalkylation reaction zone;
(c) supplying benzene to said transalkylation reaction
zone;
(d) operating said transalkylation reaction zone under
temperature and pressure conditions to maintain said
polyalkylated aromatic component in a liquid phase and
effective to cause disproportionation of said polyalkylated
aromatic component to arrive at a disproportionation product
having a reduced polyalkyl benzene content and an enhanced
mono-alkyl benzene content;
(e) recovering said disproportionation product from
said transalkylation zone;
(f) supplying a feedstock containing benzene and a
C2-C4 alkylating agent to an alkylation reaction zone
containing a molecular sieve aromatic alkylation catalyst
having an average pore size which is less than the average
pore size of said high porosity zeolite-Y;
(g) operating said alkylation reaction zone to produce
an alkylated product comprising a mixture of mono-alkylated
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