EP0159696A2
Expired / Lapsed
EP
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Self-supporting structures containing immobilized carbon particles and method for forming same
Assignee: Pall Corp
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Filing: 1985-04-23
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Granted: —
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Expires: 2005-04-23
Abstract
Abstract A process for immobilizing adsorbent 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 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 28 bar while the mixture is at an elevated temperature, this temperature being near the solid-liquid transition stage (when the poly- , meric binding material is a thermoplastic material), thereby forming the structure and immobilizing the particles.
Inventors
- 👤 Peter John Degen
- 👤 Thomas Charles Gsell
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 03:05
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28014; B01J20/28026; A; A62; A62B; A62B19/00; B01J20/02; B01J20/20; B01J20/28002; B01J20/28004; B01J20/2803; B01J20/28042
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
170 words
A process for immobilizing adsorbent carbon particles and forming a self-supporting structure of high compressive strength therefrom, thereby substantially eliminating the formation of carbon fines while retaining the adsorption characteristics of said carbon particles, comprising the steps of: (a) mixing 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 thermoplastic material 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 said thermoplastic material having particle sizes in the range of about 8 to about 20 microns, to form a mixture of said carbon particles partially coated with said thermoplastic material; (b) placing said mixture in a container of the desired shape; and (c) applying a pressure of up to about 28 bar while the mixture is at a temperature corresponding to the solid-liquid transition stage of the thermoplastic material, thereby forming said structure and immobilizing said particles.
Claim 2
Dependent Claim
170 words
A process for immobilizing adsorbent carbon particles and forming a self-supporting structure of high compressive strength therefrom, thereby substantially eliminating the formation of carbon fines while retaining the adsorption characteristics of said carbon particles, comprising the steps of: (a) mixing 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 thermoplastic material 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 said thermoplastic material having particle sizes in the range of about 8 to about 20 microns, to form a mixture of said carbon particles partially coated with said thermoplastic material; (b) placing said mixture in a container of the desired shape; and (c) applying a pressure of up to about 28 bar while the mixture is at a temperature corresponding to the solid-liquid transition stage of the thermoplastic material, thereby forming said structure and immobilizing said particles.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein said temperature is 30 to 50 degrees Celsius above the Vicat softening point of said thermoplastic material.
Claim 4
Dependent Claim
26 words
The process of claim 1 wherein the percentage by weight of said powdered thermoplastic material is 7 percent based on the weight of the total mixture.
Claim 5
Dependent Claim
29 words
The process of claim 1 wherein a major portion of the particles of said thermoplastic material has particle sizes in the range of about 15 to about 20 microns.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein the pressure applied to said mixture is about 0.021 to about 0.70 bar.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein the thermoplastic material comprises a polyolefin.
Claim 8
Dependent Claim
10 words
The process of claim 6 wherein the polyolefin comprises polyethylene.
Claim 9
Dependent Claim
20 words
The process of claim 1 wherein the thermoplastic material comprises a copolymer of polyolefin and a second ethylenically unsaturated substance.
Claim 10
Dependent Claim
14 words
The process of claim 1 wherein said adsorbent carbon particles comprise activated carbon particles.
Claim 11
Dependent Claim
84 words
The process of claim 1, 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 up to about 28 bar is applied to said mixture while at a temperature of about 30 to about 50 degrees C above the Vicat softening point of the thermoplastic material.
Claim 12
Dependent Claim
23 words
The process of claim 1, wherein said adsorbent carbon particles are impregnated with a metal compound prior to mixing with said thermoplastic material.
Claim 13
Dependent Claim
164 words
A process for immobilizing adsorbent carbon particles and forming a self-supporting structure of high compressive strength therefrom, thereby substantially eliminating the formation of carbon fines while retaining the adsorption characteristics of said carbon particles, comprising the steps of: (a) mixing 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 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 said polymeric binding material having particle sizes in the range of about 8 to about 20 microns, to form a mixture of said carbon particles partially coated with said polymeric binding material; (b) placing said mixture in a container of the desired shape; and (c) applying a pressure of up to about 28 bar while the mixture is at an elevated temperature, thereby forming said structure and immobilizing said particles.
Claim 14
Dependent Claim
164 words
A process for immobilizing adsorbent carbon particles and forming a self-supporting structure of high compressive strength therefrom, thereby substantially eliminating the formation of carbon fines while retaining the adsorption characteristics of said carbon particles, comprising the steps of: (a) mixing 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 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 said polymeric binding material having particle sizes in the range of about 8 to about 20 microns, to form a mixture of said carbon particles partially coated with said polymeric binding material; (b) placing said mixture in a container of the desired shape; and (c) applying a pressure of up to about 28 bar while the mixture is at an elevated temperature, thereby forming said structure and immobilizing said particles.
Claim 15
Dependent Claim
98 words
A self-supporting, immobilized carbon structure substantially free of mobile carbon fines having a low pressure drop and high adsorptive capacity comprising: adsorbent carbon particles, a major portion of which has particle sizes in the range of from about 200 to about 2,000 microns; about 0.5 to about 5 percent by weight, based on the weight of adsorbent carbon particles, of immobilized carbon fines; and about 5 to about 20 percent by weight of a thermoplastic material, the percentage of said thermoplastic material based on the total weight of the mixture of thermoplastic material, carbon particles and carbon fines.
Claim 16
Dependent Claim
98 words
A self-supporting, immobilized carbon structure substantially free of mobile carbon fines having a low pressure drop and high adsorptive capacity comprising: adsorbent carbon particles, a major portion of which has particle sizes in the range of from about 200 to about 2,000 microns; about 0.5 to about 5 percent by weight, based on the weight of adsorbent carbon particles, of immobilized carbon fines; and about 5 to about 20 percent by weight of a thermoplastic material, the percentage of said thermoplastic material based on the total weight of the mixture of thermoplastic material, carbon particles and carbon fines.
Claim 17
Dependent Claim
26 words
The self-supporting structure according to claim 13 wherein the particle sizes of said carbon fines is in the range of about 0.1 to about 50 microns.
Claim 18
Dependent Claim
20 words
The self-supporting structure according to claim 13 wherein the percentage by weight of said powdered thermoplastic material is 7 percent.
Claim 19
Dependent Claim
14 words
The self-supporting structure according to claim 13 wherein the thermoplastic material comprises a polyolefin.
Claim 20
Dependent Claim
12 words
The self-supporting structure according to claim 16 wherein the polyolefin comprises polyethylene.
Claim 21
Dependent Claim
22 words
The self-supporting structure according to claim 13 wherein the thermoplastic material comprises a copolymer of polyolefin and a second ethylenically unsaturated substance.
Claim 22
Dependent Claim
18 words
The self-supporting structure according to claim 13 wherein said adsorbent carbon particles are impregnated with a metal compound.
Claim 23
Dependent Claim
101 words
A self-supporting, immobilized carbon structure substantially free of mobile carbon fines having a low pressure drop and high adsorptive capacity comprising: adsorbent carbon particles, a major portion of which has particle sizes in the range of from about 200 to about 2,000 microns; about 0.5 to about 5 percent by weight, based on the weight of adsorbent carbon particles, of immobilized carbon fines; and about 5 to about 20 percent by weight of a polymeric binding material, the percentage of said polymeric binding material based on the total weight of the mixture of polymeric binding material, carbon particles and carbon fines.
Claim 24
Dependent Claim
101 words
A self-supporting, immobilized carbon structure substantially free of mobile carbon fines having a low pressure drop and high adsorptive capacity comprising: adsorbent carbon particles, a major portion of which has particle sizes in the range of from about 200 to about 2,000 microns; about 0.5 to about 5 percent by weight, based on the weight of adsorbent carbon particles, of immobilized carbon fines; and about 5 to about 20 percent by weight of a polymeric binding material, the percentage of said polymeric binding material based on the total weight of the mixture of polymeric binding material, carbon particles and carbon fines.
References Cited (Backward Citations)
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