Yun Hui Lim

Toluene vapor capture by activated carbon particles in a dual gas-solid cyclone system

Capturing of odorous compounds such as toluene vapor by a particulate-activated carbon adsorbent was investigated in a gas-solid cyclone, which is one type of mobile beds. The test cyclone was early modified with the post cyclone (PoC) and a spiral flow guide to the vortex finder. The proposed process may contribute to the reduction of gases and dust from industrial exhausts, especially when dealing with a low concentration of odorous elements and a large volume of dust flow. In this device, the toluene capturing efficiency at a 400 ppm concentration rose up to 77.4% when using activated carbon (AC) particles with a median size of 27.03 μm. A maximum 96% of AC particles could be collected for reuse depending on the size and flow rate. The AC regenerated via thermal treatment showed an adsorption potential up to 66.7% throughout repeated tests. Implications: VOCs and particles have been of interest both in industrial field and public indoor spaces. In this study, a post cyclone (PoC) that utilizes a residual vortex from the mother cyclone was modified by inserting a flow guide and was applied to capture toluene vapor. The device of modified post-cyclone system can be used effectively in simultaneous treatment of gas-solid flow.

Adsorption of Low-level CO 2 using Activated Carbon Pellet with Glycine Metal Salt Impregnation

Abstract The present study has evaluated the CO 2 adsorption amount of activated carbon pellets (AC). Coconut shellbased test AC were modi Þ ed with surface impregnation of glycine, glycine metal salts and monoethanolamine forlow level CO 2 (3000ppm) adsorption. Physical and chemical properties of prepared adsorbents were analyzed andthe adsorbed amount of CO 2 was investigated by using pure and 3,000ppm CO 2 levels. The impregnation of nitro-gen functionalities was veri Þ ed by XPS analysis. The adsorption capacity for pure CO 2 gas was found to reach upto3.08mmol/g by AC -LiG(Activated carbon -Lithium glycinate), which has the largest speci Þ c surface area(1026.9m 2 /g). As for low level CO 2 s ow the primary amine impregnated adsorbent showed 0.26 mmol/g of adsorptionamount, indicating the highest selectivity. An adsorbent with potassium -glycine salts(AC -KG, Activated carbon -Potassium glycinate) instead of amine presented with 0.12mmol/g of adsorption capacity, which was higher thanthat of raw activated carbon granules(0.016mmol/g). Key words : CO