Description:

Magnetic Thiol-SAMMS (THFG*) is a molecular engineered adsorbent specifically designed to capture and remove mercury from gaseous waste streams. The fast kinetics, high loading capacity, strong covalent bonding and the ability to recover and reuse place SAMMS as the best technology available when low concentrations of mercury are desired.

Significant Benefits:

1. Loading Capacity – THFG is a technologically advanced gaseous elemental mercury (GEM) adsorbent. Thiol-ligands are not normally seen as highly efficient adsorbents for GEM; however, the unique chemistry of THFG is highly effective.

Capacity of THFG in a gaseous environment where GEM is the target will be defined by both the inherent capacity of the adsorbent and the configuration of use. The high mercury adsorption capacity of THFG (150-250 mg Hg/g adsorbent) in a liquid test indicates its high inherent capacity.

If THFG is incorporated into a filter, then the more relevant measure of capacity is the breakthrough time, typically in number of bed volumes. If THFG is used by injection in a gas stream, the adsorbent capacity should be maximized by removal using commercially available magnetic separation technology and re-injected for re-use. The customer may anticipate a high capacity compared with only one time use (most other adsorbents are for one time use since separation of adsorbent is not practical when other solids such as fly ash are present).

2. Kinetics – The kinetics of mercury adsorption by THFG is extremely fast. Figure 1 shows the results of a packed bed test for which gaseous elemental mercury (GEM) or Hg0 was admitted into a dry nitrogen stream. Residence time in the bed ranged from 0.64 to 1.3 seconds and was varied by modifying bed depth and flow rate.


Figure 1 – Greater than 99% removal for 500 minutes (packed bed)

3. Selectivity – Most cations and anions have a minimal impact on SAMMS performance and THFG is highly selective for mercury and other “soft” heavy metals such as silver, cadmium, copper and lead
4. Adsorption Capabilities and Recovery – THFG possesses superior adsorption capabilities by covalently bonding to remove mercury from contaminated gaseous waste streams. The adsorbent is ferromagnetic and can be recovered from the waste stream by using commercially available magnetic separation technology.
5. Cost of Disposal - THFG is a cost effective alternative to other commercially available sorbents when comparing the full cost benefits. Compared to other sorbents SAMMS is able to adsorb large quantities of mercury with little solid waste generated for disposal. In addition, SAMMS can be regenerated to recover the mercury and reuse the adsorbent to further lower operational cost.

Material Properties:

• Bulk Density – The bulk density for THFG is approximately 0.8 - 0.9 g/cc.
• Average Particle Size – approximately 40 microns.

Please refer to the General information sheet for Thiol-SAMMS®.

* Patent Pending