High performance filters based on inorganic fibers and inorganic fiber

Abstract

A filter media structure, which is capable of operating in the micro- and nanofiltration regime, offers: low cost, durability, high temperature and chemical resistance, high permeability, high flow rate, low pressure drop across the filter media, high mechanical strength, separation efficiency, and biocompatibility. The filter media structure is comprised of mixture of carbon or ceramic fibers and inorganic fiber whiskers generally having a diameter of from about 0.03 to about 5 microns. The present invention further provides a method of preparing a filter media structure comprising mixing together a) inorganic fibers; b) inorganic fiber whiskers; c) a water soluble binder, and optionally depositing a thin layer of pyrolytic carbon on the surface of the inorganic fibers and inorganic fiber whiskers comprising the filter media structure. The filter media structure is selected from the group consisting of a paper, felt and fabric. The present invention provides a further method for preparing a filter media structure comprising a) mixing together inorganic fiber whiskers and a resin selected from the group consisting of thermosetting and thermoplastic resins; b) impregnating inorganic fibers with said inorganic fiber whisker/resin mixture to form a paper.