High temperature filter

A pleated high temperature filter system comprising a housing and a pleated high temperature filter, wherein the high temperature filter comprises:

• a membrane having an inner surface and an outer surface;
• a support substrate having an inner surface and an outer surface, wherein the support substrate is selected from the group consisting of a woven textile, a non-woven textile, a knit textile, and a film, and wherein the support substrate has a support operating temperature of at least about 500° F.;
• and,
• a porous adhesive layer, wherein the porous adhesive layer is adjacent the inner surface of the membrane and the inner surface of the support substrate such that the membrane and the support substrate sandwich the porous adhesive layer, wherein the porous adhesive layer extends between the inner surface of the membrane and the inner surface of the support substrate and comprises pores, and wherein the porous adhesive layer comprises an adhesive having an adhesive operating temperature of at least about 450° F.

A method of forming a high temperature filter comprising, in order:

• forming a support substrate having an inner surface and an outer surface, wherein the support substrate is selected from the group consisting of a woven textile, a non-woven textile, a knit textile, and a film, and wherein the support substrate has a support operating temperature of at least about 500° F.;
• foam coating an open cell foamed adhesive and solvent composition onto the inner surface of the support substrate;
• removing the solvent from the open cell foamed adhesive and solvent composition forming the porous adhesive layer;
• placing a membrane having an inner surface and an outer surface onto the porous adhesive layer such that the porous adhesive layer is adjacent the inner surface of the membrane;
• laminating the membrane, porous adhesive layer, and the support substrate using heat and optionally pressure at a temperature above the adhesive operating temperature of the adhesive in the porous adhesive layer and below the support operating temperature of the support substrate.

A high temperature filter formed by

• a method of forming a high temperature filter comprising, in order:
• forming a support substrate having an inner surface and an outer surface, wherein the support substrate is selected from the group consisting of a woven textile, a non-woven textile, a knit textile, and a film, and wherein the support substrate has a support operating temperature of at least about 500° F.;
• foam coating an open cell foamed adhesive and solvent composition onto the inner surface of the support substrate;
• removing the solvent from the open cell foamed adhesive and solvent composition forming the porous adhesive layer;
• placing a membrane having an inner surface and an outer surface onto the porous adhesive layer such that the porous adhesive layer is adjacent the inner surface of the membrane;
• laminating the membrane, porous adhesive layer, and the support substrate using heat and optionally pressure at a temperature above the adhesive operating temperature of the adhesive in the porous adhesive layer and below the support operating temperature of the support substrate.

The process of reducing particulates in a flue gas comprising:

• passing a flue gas having a temperature of at least 250° F. and containing particulates through a high temperature filter comprising:
• a membrane having an inner surface and an outer surface;
• a support substrate having an inner surface and an outer surface, wherein the support substrate is selected from the group consisting of a woven textile, a non-woven textile, a knit textile, and a film, and wherein the support substrate has a support operating temperature of at least about 500° F.;
• and,
• a porous adhesive layer, wherein the porous adhesive layer is adjacent the inner surface of the membrane and the inner surface of the support substrate such that the membrane and the support substrate sandwich the porous adhesive layer, wherein the porous adhesive layer extends between the inner surface of the membrane and the inner surface of the support substrate and comprises pores, and wherein the porous adhesive layer comprises an adhesive having an adhesive operating temperature of at least about 450° F.;
• wherein at least a portion of the particulates are collected on the outer surface of the membrane.

A filter comprising:

• a membrane having an inner surface and an outer surface;
• a support substrate having an inner surface and an outer surface, wherein the support substrate is selected from the group consisting of a woven textile, a non-woven textile, a knit textile, and a film;
• and,
• a porous adhesive layer, wherein the porous adhesive layer is adjacent the inner surface of the membrane and the inner surface of the support substrate such that the membrane and the support substrate sandwich the porous adhesive layer, wherein the porous adhesive layer extends between the inner surface of the membrane and the inner surface of the support substrate and comprises pores.