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AssigneeExxonMobil Research and Engineering Company
InventorsMichael C. CLARK, Benjamin S. UMANSKY, Elizabeth A. NYE, Mark J. REICHENSPERGER, William C. LEWIS
Estimating the term…
A process for the alkylation of a benzene-containing refinery stream such as reformate with light refinery olefins which is capable of achieving high benzene conversion levels operates in a fixed bed of an MWW zeolite catalyst, preferably MCM-22, in single pass mode in the liquid phase at a relatively low to moderate temperatures with pressure maintained at a value adequate to ensure subcritical operation. High levels of benzene conversion with conversions of at least 90% and higher, e.g. 92% or 95% or even higher are achievable. A high octane product is produced, comprising mono-, di- and tri-alkylbenzenes with lesser levels of the tetra-substituted products. By operating with staged olefin injection, the end point of the alkylation product can be maintained at a low value while, at the same time, achieving high levels of benzene and olefin conversion.
A process for producing a gasoline boiling range hydrocarbon product of low benzene content from a light, benzene-containing aromatic feed stream which comprises alkylating the aromatic feed stream in the presence of an MWW zeolite catalyst in at least two fixed catalyst beds in series in a single pass operation with an propylene-containing olefinic feed stream comprising at least 50 weight percent propylene injected at the inlet to each catalyst bed under conditions of elevated temperature and pressure to convert at least 70 weight percent of the benzene in the reformate feed to alkylbenzenes.
A process for producing a gasoline boiling range hydrocarbon product having a benzene concentration of not more than 1 volume percent from a reformate feed having a benzene concentration of at least 20 weight percent which comprises alkylating the reformate feed in an alkylation reactor in the presence of an MWW zeolite catalyst in at least two fixed catalyst beds in a single pass operation in the liquid phase with an propylene-containing olefinic feed stream comprising at least 60 weight percent propylene injected between catalyst beds at a reactor inlet temperature from 200 to 250° C. and a pressure sufficient to maintain liquid phase conditions and from 4,000 to 10,000 kPag (reactor inlet), at a space velocity of 1 to 5 LHSV hr.−1 with a weight ratio of propylene-containing olefinic stream to reformate stream from 0.8 to 3.0, to convert at least 90 weight percent of the benzene in the reformate feed to propylbenzenes and produce an effluent from the alkylation reactor which has a T90 of not more than 230° C. and with an octane rating (RON+MON)/2 not less than 82.
A motor gasoline having a benzene content of not more than 1.0 vol. pct, and end point (ASTM D 86) of not more than 225° C., a T90 (ASTM D 86) of not more than 185° C. and comprising mono-propylbenzene, di-isopropylbenzene and tri-isopropyl benzene.
Dependencies are inferred from the claim text.