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AssigneeUop LLC
InventorsChristopher D. Gosling, Paul G. Blommel, Michelle J. Cohn, Ralph D. Gillespie, Jennifer S. Holmgren
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A method of continuously promoting the activity of solid strong acid catalysts used in acid catalyzed reactions by adding or generating water in the reaction mixture has been developed. The solid strong acid catalyst may be a sulfated metal oxide, a tungstated metal oxide, or a molybdated metal oxide. The metal oxides are oxides, hydroxides, oxyhydroxides, or oxide-hydrates of Group IV-A, Group III-A, Group III-B, and Group V-A metals. The catalyst may also contain a Group VIII metal, or when the metal oxide is a hydroxide, oxide, oxyhydroxide, or oxide-hydrate of the Group IV-A, Group III-A, or Group III-B metals, the catalyst may also contain an oxide, hydroxide, oxyhydroxide or oxide-hydrate of a Group V-A, Group V-B, Group VI-B, or Group VII-B metal as a promoter. The acid catalyzed reactions where the activity promotion method may be applied include catalytic cracking, catalytic reforming, hydrodesulfurization, isomerization, alkylation of aliphatic and aromatic hydrocarbons, polymerization, and oligomerization. The amount of water added to or generated in the reaction mixture may be from about 0.1 ppm to about 500 ppm water.
A method of promoting the activity of a solid strong acid catalyst in catalyzing continuous isomerization of a linear alkane containing from about 4 to about 8 carbon atoms to a branched alkane, said catalyst having both Lewis acid sites and Bronsted acid sites and selected from the group consisting of sulfated metal oxides, tungstated metal oxides, and molybdated metal oxides, said method comprising converting Lewis acid sites to Bronsted acid sites in situ by adding water in an amount ranging from about 1 ppm to about 50 ppm or a water precursor in an amount sufficient to generate from about 1 ppm to about 50 ppm water.
A method of promoting the activity of a solid strong acid employed as a catalyst in a continuous acid catalyzed reaction, said catalyst having Lewis acid sites and Bronsted acid sites, and selected from the group consisting of sulfated metal oxides, tungstated metal oxides, and molybdated metal oxides, said acid catalyzed reaction being selected from the group consisting of catalytic cracking, catalytic reforming, hydrodesulfurization, isomerization, alkylation of aliphatic and aromatic hydrocarbons, polymerization, and oligomerization, and said method comprising converting Lewis acid sites to Bronsted acid sites in situ by adding water in an amount ranging from about 0.1 ppm to about 500 ppm or a water precursor in an amount sufficient to generate from about 0.1 ppm to about 500 ppm water.
Dependencies are inferred from the claim text.