Alkylation using zeolite SSZ-25
AssigneeChevron Research and Technology Company
InventorsDennis L. Holtermann, Robert A. Innes
Life of this patent
Estimating the term…
Abstract
A process for the alkylation of an aromatic hydrocarbon which comprises contacting the aromatic hydrocarbon with a C.sub.2 to C.sub.4 olefin alkylating agent under at least partial liquid phase conditions, and in the presence of a catalyst comprising zeolite SSZ-25. The invention also provides a process for producing a reduced benzene content gasoline blend stock. A benzene-containing light hydrocarbon stream having less than 50 weight present benzene is contacted with a C.sub.2 -C.sub.4 olefin stream in an alkylation zone containing an SSZ-25 catalyst under alkylation conditions to produce an alkylated light hydrocarbon stream with reduced benzene content. The alkylated light hydrocarbon stream is then usable as gasoline blend stock.
Claims54
A hydrocarbon conversion process comprising using calcined SSZ-25 zeolite under hydrocarbon conversion conditions in the reaction of alkylating wherein said zeolite has the X-ray diffraction lines of Table 2.
A process for alkylating an aromatic hydrocarbon by reacting an aromatic hydrocarbon and a C.sub.2 and C.sub.4 olefin in the presence of a SSZ-25 alkylation catalyst, said process comprising introducing a mixture of aromatic hydrocarbon and C.sub.2 to C.sub.4 olefin into the first stage of an alkylator having at least two reactor stages, each stage containing alkylation catalyst, and mixing the effluent from each reactor stage with a fresh mixture of aromatic hydrocarbon and C.sub.2 and C.sub.4 olefin prior to introduction of said effluent to the next reactor stage, wherein the alkylation catalyst in one of the reactor stages is SSZ-25.
A process for preparing monoalkylated aromatic hydrocarbons which comprises:
- (a) alkylating an aromatic hydrocarbon by reacting an aromatic hydrocarbon and a C.sub.2 to C.sub.4 olefin in the presence of an alkylation catalyst by introducing a mixture of aromatic hydrocarbon having at least two reactor stages, each stage containing alkylation catalyst, and mixing the effluent from each reactor stage with a fresh mixture of aromatic hydrocarbon and C.sub.2 and C.sub.4 olefin prior to introduction of said effluent to the next reactor stage;
- (b) separating the product from step (a) into fractions comprising:
- (1) an aromatic hydrocarbon fraction,
- (2) monoalkyl aromatic hydrocarbon fraction, and
- (3) a polyalkyl aromatic hydrocarbon fraction;
- and
- (c) contacting the polyalkyl aromatic hydrocarbon fraction with additional aromatic hydrocarbon feed in a transalkylation zone under at least partial liquid phase conditions and in the presence of a transalkylation catalyst, wherein the alkylation catalyst in one of the reactor stages of step (a) is SSZ-25.
A process for preparing monoalkylated aromatic hydrocarbons which comprises:
- (a) contacting a stoichiometric excess of an aromatic hydrocarbon feed with a C.sub.2 to C.sub.4 olefin in an alkylation zone under at least partial liquid phase conditions and in the presence of a catalyst comprising zeolite SSZ-25;
- (b) separating the product from step (a) into fractions comprising (1) an aromatic hydrocarbon fraction, (2) a monoalkyl aromatic hydrocarbon fraction and (3) a polyalkyl aromatic hydrocarbon fraction;
- and
- (c) contacting the polyalkyl aromatic hydrocarbon fraction with additional aromatic hydrocarbon feed in a transalkylation zone under at least partial liquid phase conditions and in the presence of a transalkylation catalyst.
Dependencies are inferred from the claim text.