Aluminum promoted hydrogenation of alkylation sludge for aluminum chloride recovery
AssigneeKerr-McGee Corporation
InventorsElliott P. Doane, Jim Yuen-Fong Low, Larry G. Sherman, William A. Yuill
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Abstract
The recovery of aluminum chloride from deactivated alkylation catalyst complexes by hydrogenation using hydrogen gas and an aluminum catalyst is disclosed. Using aluminum to catalyze the hydrogenation allows the reaction to proceed at a lower temperature and pressure while reducing the amount of hydrogen chloride present in the reactor thus reducing the corrosiveness and cost of the aluminum chloride recovery. Methods for batch, batchwise continuous, and continuous aluminum chloride recovery are disclosed.
Claims32
A process for the recovery of aluminum chloride from a sludge complex precipitated from the products of an alkylation reaction of an olefin with isobutane promoted by a homogeneous alkylaluminum chloride-based catalyst comprising:
- forming a mixture consisting of the sludge complex and an aluminum catalyst;
- reacting the sludge complex in the mixture with hydrogen in the presence of the aluminum catalyst to form aluminum chloride;
- and recovering the aluminum chloride from the reaction mixture, wherein the reaction step is carried out for a time of from about 2 to about 4 hours and the sludge complex and the aluminum catalyst are mixed in a weight ratio of from about 6:1 to about 7:1.
A process for the recovery of aluminum chloride from a sludge complex precipitated from the products of a hydrocracking reaction conducted in a specified paraffin solvent and promoted by a homogeneous alkylaluminum chloride-based catalyst comprising:
- forming a mixture consisting of the sludge complex and an aluminum catalyst;
- reacting the sludge complex in the mixture with hydrogen in the presence of the aluminum catalyst to form aluminum chloride;
- and
- recovering the aluminum chloride from the reaction mixture, wherein the reaction step is carried out for a time of from about 2 to about 4 hours and the sludge complex and the aluminum catalyst are mixed in a weight ratio of from about 6:1 to about 7:1.
A process for the recovery of aluminum chloride from a sludge complex precipitated from the products of an alkylation reaction of an olefin wit isobutane promoted by a homogeneous alkylaluminum chloride-based catalyst comprising:
- forming a mixture consisting of the sludge complex and an aluminum catalyst;
- reacting the sludge complex in the mixture with hydrogen in the presence ofthe aluminum catalyst to form aluminum chloride;
- and
- recovering the aluminum chloride from the reaction mixture, wherein the homogeneous alkyaluminum chloride-based catalyst comprises from about 43 weight percent bound-hydrocarbon to about 70 weight percent bound-hydrocarbon and from about 30 weight percent bound-aluminum chloride to about 57 weight percent bound-aluminum chloride.
A process for the recovery of aluminum chloride from a sludge complex precipitated from the products of a hydrocracking reaction conducted in a paraffinic solvent and promoted by a homogeneous alkylaluminum chloride based catalyst comprising:
- forming a mixture consisting ofthe sludge complex and an aluminum catalyst;
- reacting the sludge complex in the mixture with hydrogen in the presence of the aluminum catalyst to form aluminum chloride;
- and
- recovering the aluminum chloride from the reaction mixture, wherein said homogeneous alkylaluminum chloride-based catalyst comprises from about 43 weight percent bound-hydrocarbon to about 70 weight percent bound-hydrocarbon and from about 30 weight percent bound-aluminum chloride to about 57 weight percent bound-aluminum chloride.
Dependencies are inferred from the claim text.