Paper Title
Solubility of Naphthalene as a Tar Model Compound in various Solvents for Tar Removal in a Dual Fluidized bed Biomass Gasification Process

Abstract
Tar condensation cause subsequent blockage in the downstream application of the gasification process. An oil scrubber is considered as an effective method for tar removal. In this research, the naphthalene solubility in different local Thai oils and water was investigated in a laboratory-scale test-rig. The solubility value was conducted at 30, 50, 70, and 80°C. Different biodiesels were investigated, namely rapeseed methyl ester (RME) and two different palm methyl esters (PME 1 and PME 2). Furthermore, the vegetable oils including sunflower oil, rice bran oil, crude palm oil, and refined palm oil were investigated. The results of the tests showed that higher temperature enhances naphthalene solubility in all oils. Biodiesel gave the highest value of naphthalene solubility. All scrubbing oils have similar naphthalene solubility trends for 50-80C in the order of RME > PME 1 > PME 2 > diesel > sunflower oil > refined palm oil > rice bran oil > crude palm oil. Based on these experimental investigations, PME 1 has given the naphthalene solubility value similar to RME. Therefore, PME 1 is selected to be tested as scrubbing solvent in the Thailand 1 MWel prototype DFB gasifier at NongBua district in NakhonSawan province, Thailand. Keywords - Tar Removal, Oil scrubber, Solvent Scrubbing, Naphthalene, Dual Fluidized Bed Gasification