Coated catalyst for aromatic alkylation
AssigneeCatalytic Distillation Technologies
InventorChristopher C. Boyer
Life of this patent
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Abstract
A catalyst useful for multi-phase reactors that includes an active component surrounded by a coating on a surface of the active component, wherein the coating provides a liquid film around the active component to increase the useful life of the active component as compared to an uncoated active component.
Claims14
A catalyst useftil for multi-phase reactors comprising:
- an active component surrounded by an inert, porous coating on a surface of the active component, wherein the inert, porous coating provides a liquid film around the active component to increase the useful life of the active component as compared to an uncoated active component;
- wherein said inert, porous coating has a pore diameter and contact angle which are selected in conjunction with the surface tension of the liquid to maintain a capillary pressure high enough to prevent the liquid from being displaced by vapor during a two phase flow over the catalyst;
- wherein the capillary pressure is calculated by the formula Pc=2σ cos θ/r;
- where
- Pc is the capillary pressure, psi;
- σ is the surface tension of the liquid, pounds per cubic inch;
- θ is the contact angle of the inert, porous coating in radians;
- and
- r is the radius of the pore, inches.
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A catalyst useful for multi-phase reactors comprising an active component surrounded by an inert, porous coating on the surface of the active component, said inert, porous coating is characterized as having liquid capillary pressure, calculated by the formula Pc=2σ cos θ/r where
- Pc is the capillary pressure, psi;
- σ is the surface tension of the liquid, pounds per cubic inch;
- θ is the contact angle of the inert, porous coating in radians;
- and
- r is the radius of the pore, inches;
- wherein the capillary pressure as calculated is at least 0.5 psi.
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Dependencies are inferred from the claim text.