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AssigneePall Corporation
InventorsPeter J. Degen, Thomas C. Gsell
Estimating the term…
A process for immobilizing reactive Whetlerite carbon particles and forming a self-supporting structure of high compressive strength therefrom is described in which the self-supporting structure substantially eliminates the formation of carbon fines while retaining the adsorption characteristics of the carbon particles. The process for immobilizing the adsorbent carbon particles in the self-supporting structure comprises the steps of: (a) mixing in an environment having a relative humidity of less than about 35 percent, Whetlerite carbon particles, a major portion of which has particle sizes in the range of from about 200 to about 2,000 microns, with a powdered polymeric binding material, preferably a thermoplastic material having a solid-liquid transition stage, in an amount of about 5 to about 20 percent by weight, based on the weight of the total mixture, a major portion of the particles of the polymeric binding material having particle sizes in the range of about 8 to about 30 microns, to form a mixture of the carbon particles partially coated with the polymeric binding material; (b) placing the mixture in a container of a desired shape; and (c) applying a pressure of up to about 400 psi while the mixture is contacted with an inert gas and is at an elevated temperature, this temperature being near the solid-liquid transition stage (when the polymeric binding material is a thermoplastic material), thereby forming the structure and immobilizing the particles.
A process for immobilizing reactive Whetlerite carbon particles and forming a self-supporting, dust-free structure of high compressive strength therefrom, thereby substantially eliminating the formation of carbon fines while retaining the reactivity and adsorption characteristics of said Whetlerite carbon particles, comprising the steps of:
The process of claim l wherein the percentage by weight of said powdered thermoplastic material is 7 percent based on the weight of the total mixture.
The process of claim l wherein the pressure applied to said mixture is about 0.3 to about 10 psi.
The process of claim l wherein activated carbon particles are used to form said reactive Whetlerite carbon particles.
The process of claim l wherein said thermoplastic material is polyethylene, a major portion of which has particle sizes in the range of about 15 to about 20 microns and is present in an amount of about 7 percent by weight, based on the weight of said carbon particles, and a pressure of about 40 psi is applied to said mixture while contacted with an inert gas at a temperature of about 50 to about 90 degrees F. above the Vicat softening point of the thermoplastic material.
A process for immobilizing reactive Whetlerite carbon particles and forming a self-supporting, dust-free structure of high compressive strength therefrom, thereby substantially eliminating the formation of carbon fines while retaining the reactivity and adsorption characteristics of said Whetlerite carbon particles, comprising the steps of:
A self-supporting, immobilized carbon structure substantially free of mobile carbon fines having a low pressure drop and high reactivity for toxic gases comprising:
A self-supporting, immobilized carbon structure substantially free of mobile carbon fines having a low pressure drop and high reactivity comprising:
Dependencies are inferred from the claim text.