Process for drying porous materials
AssigneeE. I. Du Pont de Nemours and Company
InventorHarold L. Jackson
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Abstract
Process, suitable for drying water-wet porous materials, for example, textiles, which comprises forcing a displacement liquid through the open interstices of the water-wet porous material to remove the water, the displacement liquid consisting of a water-immiscible, normally liquid organic solvent having a surface-active agent dissolved therein, said displacement liquid having at 25.degree.C. an interfacial tension versus water of no greater than about 10 dynes cm..sup..sup.-1 at 25.degree.C., a density of at least about 1.25 grams cm..sup..sup.-3 and an advancing adhesion tension versus platinum which is positive, and recovering porous material whose open interstices are substantially free of liquid water.
Claims24
Process for drying water-wet porous materials, which process comprises forcing a displacement liquid through the open interstices of the water-wet porous material to remove the water, the displacement liquid consisting of a water-immiscible, normally liquid organic solvent having a surface-active agent dissolved therein, said displacement liquid having at 25.degree.C. an interfacial tension versus water of no greater than about 10 dynes cm.sup.-.sup.1 at 25.degree.C., a density of at least about 1.25 grams cm..sup.-.sup.3 and an advancing adhesion tension versus platinum which is positive, and recovering porous material whose open interstices are substantially free of liquid water.
Dependencies are inferred from the claim text.