Brominated Carbon Sorbent Water Leaching Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Brominated carbonaceous sorbents used in semi-dry, high moisture, and fully wet SO2 scrubbers suffer from significant water leaching of bromine, leading to reduced performance and environmental concerns with dissolved bromine in wastewaters.
Innovation Solution
Treating a carbonaceous substrate with an organic compound containing an olefinic double bond before, during, or after bromination to increase the non-water-leachable bromine species, thereby enhancing the sorbent's resistance to water leaching and maintaining mercury capture effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brominated carbonaceous sorbents are used for mercury emission control, then mercury capture effectiveness is improved, but water leaching of bromine increases leading to reduced performance and environmental harm
Solution Approach 1:
An organic compound containing an olefinic double bond is introduced as an intermediary substance that reacts with bromine to form a stable complex. This intermediary prevents direct water-leachable bromine species while maintaining the sorbent's mercury capture capability, effectively mediating between bromine's reactivity and water stability requirements
Solution Approach 2:
The chemical state of bromine on the sorbent surface is changed by reacting it with an olefinic compound. This transforms water-leachable bromine species into non-water-leachable organic bromine complexes, altering the parameter of bromine water solubility from high to low while preserving mercury adsorption functionality
2Reliability
If brominated carbonaceous sorbents are used in wet scrubbers, then mercury removal is improved, but dissolved bromine in discharged wastewaters increases causing environmental harm
Solution Approach 1:
The olefinic compound acts as a protective intermediary that binds bromine in a non-leachable form, preventing bromine from dissolving into the wastewater stream while allowing the sorbent to continue removing mercury from the gas phase
Solution Approach 2:
The reactive bromine that would normally leach into wastewater and cause environmental harm is converted into a stable organic bromine complex. This transformation turns a harmful leachable species into a beneficial non-leachable form that maintains sorbent functionality
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method significantly reduces water-leachable bromine from 70% to less than 10%, maintaining mercury capture performance comparable to untreated sorbents while preventing bromine loss, thus enhancing the sorbents' utility in various scrubber systems.
Implementation Method 1
contacting a carbonaceous substrate with at least one organic compound in liquid or gaseous form that contains at least one olefinic double bond, wherein bromination of the carbonaceous substrate using a bromine-containing compound is conducted prior to, during, and/or after said treatment with the organic compound
Implementation Method 2
effective sorbents for mercury emission control in gaseous streams containing mercury
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed are sorbents having superior water leachability performance characteristics especially when used as sorbents in semi-dry (CDS), high moisture (SDA), and fully wet SO2 scrubbers. Also disclosed are methods for the production of such performance-enhanced sorbents, and methods for the use of such sorbents in the removal of mercury and possibly one or more other heavy metals or other contaminants from various gaseous streams. The sorbents are carbonaceous substrates treated with a bromine-containing compound, especially gaseous bromine, and with at least one organic compound that contains at least one olefinic double bond.