Inherently concrete-compatible carbon sorbents for mercury removal from flue gas

Patent metadata

Field	Value
Publication number	US-9321032-B1
Application number	US-48181909-A
Country	US
Kind code	B1
Filing date	Jun 10, 2009
Priority date	Jun 10, 2008
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

A sorbent composition and process of making sorbent designed for the removal of contaminants from flue gas and subsequent use in cement or concrete formulations are discussed. The sorbent composition comprises a coal feed stock prepared to have a total BET surface area of at least 350 m 2 /g, and wherein the sorbent has a cumulative surface area less than 10 m 2 /g for pore diameters between 0.01 and 0.1 microns, a cumulative pore volume less than 0.055 cc/g for pore diameters between 0.01 and 0.1 microns, or both.

First claim

What is claimed is:

1. A flue gas sorbent comprising, a carbonaceous char having:
a total BET surface area of at least 350 m 2 /g; and
a cumulative surface area less than 10 m 2 /g for pore diameters between 0.01 and 0.1 microns, a cumulative pore volume less than 0.055 cc/g for pore diameters between 0.01 and 0.1 microns, or a combination thereof;
wherein the porous carbonaceous char does not significantly adsorb air entrainment admixture (AEA).

2. The sorbent of claim 1 , wherein the carbonaceous char is activated carbon.

3. The sorbent of claim 1 , wherein the total BET surface area is at least 400 m 2 /g.

4. The sorbent of claim 1 , wherein the cumulative surface area is less than 8 m 2 /g for pore diameters between 0.01 and 0.1 microns.

5. The sorbent of claim 1 , wherein the carbonaceous char further comprises at least one halogen or halide.

6. The sorbent of claim 1 , wherein the carbonaceous char further comprises at least one pore blocking agent.

7. The sorbent of claim 1 , wherein the carbonaceous char further comprises at least one surfactant.

8. The sorbent of claim 1 , wherein the carbonaceous char was treated with oxygen, halogens, or ozone.

9. The sorbent of claim 1 , wherein the carbonaceous char is prepared from lignite coal, sub-bituminous coal, coconut, or cellulosic feedstock.

10. The sorbent of claim 1 , wherein the carbonaceous char comprises a Molasses Number of less than 140.

11. A concrete comprising the sorbent of claim 1 .

Assignees

• Pollack Nicholas R
• Hayden Richard A
• Calgon Carbon Corp

Inventors

• Pollack Nicholas R
• Hayden Richard A

Classifications

• B01J20/3042

  Use of binding agents; addition of materials ameliorating the mechanical properties of the produced sorbent · CPC title

• B01J20/28071

  being less than 0.5 ml/g · CPC title

• B01J20/28011

  Other properties, e.g. density, crush strength · CPC title

• B01D2257/602

  Mercury or mercury compounds · CPC title

• B01J20/2808

  being less than 2 nm, i.e. micropores or nanopores · CPC title