Carbonaceous adsorbents and process for making same

• US 4,124,529 A
• Filed: 05/27/1977
• Issued: 11/07/1978
• Est. Priority Date: 06/02/1976
• Status: Expired due to Term

• Current Assignee: Bergwerksverband GmbH
• Original Assignee: Bergwerksverband GmbH
• Inventors: Klein, Jurgen, Knoblauch, Karl, Schroter, Hans-Jurgen, Schumacher, Horst, Romey, Ingo, Juntgen, Harald, Kolling, Georg
• Primary Examiner(s): Konopka, P. E.
• Application Number:
  US05/801,384
• Time in Patent Office: 529 Days
• Field of Search: 252/421, 252/444, 252/445, 423/445, 423/449, 264/29.1, 264/117, 201/6
• US Class Current: 502/432
• CPC Class Codes: B01D 53/02 by adsorption, e.g. preparative gas chromatography solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01
• CPC Class Codes: C01B 32/384 Granulation

Abstract

A carbonaceous adsorbent in the form of a shaped body which has been heated to about 400 to 1400° C in an inert atmosphere is composed essentially of a mixture of finely divided carbonaceous material of a grain size below 50 and up to below 100 microns with a binder composed of about 1 to 20% by weight of a natural or synthetic elastomer and about 1 to 15% by weight of a thermoplastic material. The adsorbent is made by subjecting the mixture to a shaping step followed by heating to a temperature of about 400° to 1400° C in an inert atmosphere which step may be followed by an activation of the carbonaceous material.

Claims

1. A carbonaceous adsorbent comprising a shaped coal body which has been heated in steps to about 400 to 1000°

C. in an inert atmosphere, the said body being essentially composed of a mixture of a finely divided coal material of a grain size below 50 and up to below 100 microns with a binder composed of about 1 to 20% by weight of a natural or synthetic elastomer and about 1 to 15% by weight of a thermoplastic material other than said elastomer wherein the rate of temperature increase is about 0.5°

to 10°

C./min. in the temperature range between about 400° and

600°

C. and is about 5°

to 50°

C./min. in the temperature range of about 500°

to 1000°

C.

2. The carbonaceous adsorbent of claim 1 in which the coal material is mineral coal, oxidized mineral coal, charcoal, peat coke or lignite low temperature coke.

3. The carbonaceous adsorbent of claim 1 in which the binding agent is a butadiene-acrylonitrile mixed polymerizate, butadiene-styrene mixed polymerizate and the thermoplastic material is polyvinyl alcohol, polypropylene, polyethylene or a mixture of these materials.

4. The carbonaceous adsorbent of claim 1 wherein the shaped bodies have a diameter of 0.3 to 3 mm for purposes of water purification, of 2 to 8 mm for purposes of gas separation and of 6 to 10 mm for flue gas desulfurization.

5. The carbonaceous adsorbent of claim 1 wherein the said mixture comprises 80 to 85 parts by weight of said coal material, 5 to 10 parts by weight of the elastomer and 5 to 10 parts by weight of the thermoplastic material.

6. The carbonaceous adsorbent of claim 1 wherein the shaped bodies are cylindrical bodies of a diameter below 1 mm.

7. A process for making the adsorbents of claim 1 comprising mixing said finely divided coal material of a grain size below 50 and up to below 100 microns with a binder composed of about 1 to 20% by weight of a natural or synthetic elastomer and about 1 to 15% by weight of a thermoplastic material, then subjecting the mixture to a shaping step followed by heating of the thus-obtained shaped bodies to a temperature of about 400°

to 1000°

C. in an inert atmosphere wherein the rate of temperature increase is about 0.5°

to 10°

C./min. in the temperature range between about 400° and

600°

C. and is about 5°

to 50°

C./min. in the temperature range of about 500°

to 1000°

C.

8. The process of claim 7 wherein the binder is added to the said coal material in solid or liquid form or in form of a solution.

9. The process of claim 7 wherein the shaped bodies are left at the final temperature for a time between about 5 to 45 minutes.

10. The process of claim 1 which includes the additional step of activation of the material obtained by heating at 600°

to 1000°

C.

11. The process of claim 10 wherein the activation is effected by means of steam or carbon dioxide or a mixture of both.