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

Patent metadata

Field	Value
Publication number	US-2016102019-A1
Application number	US-201514972239-A
Country	US
Kind code	A1
Filing date	Dec 17, 2015
Priority date	Jun 10, 2008
Publication date	Apr 14, 2016
Grant date	—

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 process for making a concrete-compatible sorbent, comprising the step of preparing a feedstock to have a total BET surface area of at least 350 m 2 /g and to have 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.

2 . The process of claim 1 wherein the feedstock is a carbonaceous material.

3 . The process of claim 1 further comprising the step of incorporating the sorbent into a cement or concrete formulation.

4 . The process of claim 1 wherein the sorbent has properties inherently favorable to mercury removal yet unfavorable to adsorption of AEA foaming agents when entrained in a fly ash for use in concrete manufacture.

5 . The process of claim 1 wherein the step of preparing a feedstock results with a sorbent having a total BET surface area of at least 400 m 2 /g, and a Molasses Number no greater than 140.

6 . The process of claim 1 wherein the step of preparing a feedstock results with a sorbent having the cumulative surface area less than 8 m 2 /g for pore diameters between 0.01 and 0.1 microns.

7 . The process of claim 1 wherein the step of preparing a feedstock results with a sorbent having a cumulative pore volume less than 0.05 cc/g for pore diameters between 0.01 and 0.1 microns.

8 . The process of claim 1 further comprising the step of incorporating a halogen or halide with the sorbent to enhance mercury or other contaminant removal.

9 . The process of claim 1 further comprising the step of incorporating a pore blocking agent with the sorbent to enhance concrete-compatibility.

Assignees

• 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

• B01J20/2808

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

• B01J20/28071

  being less than 0.5 ml/g · CPC title

• B01D2253/306

  Surface area, e.g. BET-specific surface · CPC title

• B01J20/28011

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