Assessment of zeolite 13X and Lewatit® VP OC 1065 for application in a continuous temperature swing adsorption process for biogas upgrading

Abstract

Two commercially available CO 2 -adsorbent materials (i.e., zeolite 13X (13X) and Lewatit® VP OC 1065 (Lewatit)) were evaluated for their applicability in a continuous temperature swing adsorption (TSA) process for biogas upgrading. The equilibrium adsorption characteristics of carbon dioxide and methane were determined by fixed bed and TGA tests. While relatively high CO 2 capacities were measured for both materials (3.6 and 2.5 mol kg), neither of them was found to adsorb significant amounts of CH 4 . Lewatit showed to be fully regenerable at 95°C, whereas for 13X, the regeneration was not complete at this temperature. However, 13X showed no degradation up to 190°C, whereas Lewatit started to degrade at 110 and 90°C when exposed to N 2 and air, respectively. Fluidization tests showed that Lewatit provides a high mechanical stability, while on the contrary, the tested 13X showed considerable attrition. An equilibrium adsorption model was fitted to the measured CO 2 adsorption data. The adsorption model was then integrated into an existing simulation tool for the proposed TSA process to roughly estimate the expectable regeneration energy demand for both materials. It was found that depending on the operating conditions, the regeneration energy demand lies between 0.32-0.54 kWh th /m 3 prodgas for 13X and 0.71-1.10 kWh th /m 3 prodgas for Lewatit. Since heat integration measures were not considered in the simulations, it was concluded that the proposed TSA process has a great potential to reduce the overall energy demand for biogas upgrading and that both tested adsorbent materials may be suitable for application in the proposed TSA process.

Evaluating Regeneration Options of Solid Amine Sorbent for CO2 Removal

“…Methane is known to be nonreactive with Lewatit. 3 , 4 H 2 S 4 and water 5 do not affect the CO 2 capacity in a negative way. For these reasons it was chosen to represent the biogas by a mixture of CO 2 and nitrogen in this study.…”

Experimental and Numerical Investigations on Heat Transfer of Bare Tubes in a Bubbling Fluidized Bed with Respect to Better Heat Integration in Temperature Swing Adsorption Systems

“…Table 2 illustrates the important material data. This adsorption material was rated as thermally and mechanically stable and shows excellent CO 2 capture properties in a continuous TSA process [29]. The particle diameter of Lewatit ® VP OC 1065 is clearly in the Geldart type B range [13], as indicated in Figure 5.…”

“…The measurements were conducted at ambient conditions with Lewatit ® VP OC 1065 as bulk material. Lewatit ® VP OC 1065 consists of a polystyrene polymer and functionalized with primary amine groups [29]. Table 2 illustrates the important material data.…”

The impact of binary water-CO2 isotherm models on the optimal performance of sorbent-based direct air capture processes.

“…24 Meanwhile, the heat capacity is reported as 1.58 kJ kg -1 K -1 . 53 Email: jpy1@hw.ac.uk RCCS, Heriot-Watt University CO2 and H2O pure component isotherms and co-adsorption isotherms were measured using the DVS Vacuum system, of which a simple schematic is depicted in Figure 4. 55 The DVS uses a gravimetric, magnetic suspension balance to accurately measure any weight changes as a result of adsorption and desorption.…”