Tar removal from biomass-derived syngas for hydrogen production: Oil absorption process considering brazilian sources

Tar absorption is simulated using Aspen Plus. Canola, soybean, palm oil, waste cooking oils (WCO), tallow biodiesel, and tall oil undergo testing. The investigation also considers individual fatty acids as washing fluids. Tar removal efficiency gets evaluated across temperatures ranging from 20 °C to 230 °C, under two distinct conditions. In the first condition, a combination of air and tars (N2, O2, benzene, toluene, ethylbenzene) is considered, while the second condition involves a mixture of gases (H2, CO, CO2, CH4, H2O, N2, and tars). Efficiency values decrease with increasing temperature in the first case, while the second case exhibits increased efficiency until approximately 150 °C for all washing fluids. Soybean oil, canola oil, and canola WCO demonstrate superior efficiency (<99.95%) and stability, whereas palm oil and palm oil WCO display lower efficiencies (∼99.70%). In both cases, the order of effectiveness remains consistent: linoleic acid > palmitic acid > oleic acid > stearic acid.