Based on adsorbent carbon sheet material

At Material Methods LLC we use a fibrillated polymer binder to form powdered materials in a self-supported, flexible sheet form. The binder is about 10% wt, and its fibrillated form ensures that the gas has free access to the particles surface. The material is flexible and can be spiral-rolled as a parallel passage contactor. We tested sheet-formed materials made from carbon nanoparticles (< 0.1 micron) or activated carbon particles (< 50 micron) as parallel passa ge contactors components for separation of 1 – 2% CO2 (vol/vol) from N2 at atmospheric pressure and room temperature. Due to the small thickness of carbon sheets and high accessibility of carbon particles, the gas diffusion limitations are sensibly lowered, and adsorption is much faster, which results in a sharper mass transfer zone and larger number of theoretical plates.


The following table shows the range of characteristics Parallel Passage Contactor made with adsorbent carbon sheets. We used activated carbon from various sources. Depending on the initial properties of the activated carbon, the carbon packing density, the adsorption capacity per canister volume, and the gas flow permeability (or associated pressure drop) may vary within the limits outlined below. A polypropylene mesh was used as an inert spacer.

Form of presentation Cylindrical canister, normally 10 cm long, 2.22 cm diameter; Total useful volume: 36.2 cm3
Active Material Carbon sheet (manufactured from activated carbon particulates or mixtures of activated carbon particulates and carbon black nanoparticles)
Sheet thickness 0.2 – 0.3 mm
Sheet length 75 – 100 cm
Carbon packing density 0.25 – 0.45 g carbon / cm3 canister
Total amount of active material 10 – 15 g carbon adsorbent sheet per canister
Air permeability 200 – 1000 Darcy
CO2 adsorption capacity 0.007 – 0.009 mmol/g (at 7.6 Torr CO2 in N2)
0.010 – 0.012 mmol/g (at 15.2 Torr CO2 in N2)
CO2 adsorption density 0.030 – 0.040 mmol/cc (at 7.6 Torr CO2 in N2)
0.020 – 0.045 mmol/cc (at 15.2 Torr CO2 in N2)
Number of theoretical plates for CO2/N2 separation 10 – 30 at 425 cm/min (1.5 L/min)
3 – 7 at 1265 cm/min (4.5 L/min)
Pressure drop per stage 0.05 – 0.20 Torr at 425 cm/min (1.5 L/min)
0.30 – 2.00 Torr at 1265 cm/min (4.5 L/min)

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