Application of methanol absorption for a biomass to liquid process

Biomass such as wood waste, sawdust and agriculture waste can be easily acquired in all parts of the country and may be a most promising renewable resource to make synthetic fuel. In order to convert biomass into liquid fuel, syngas emitted from a circulating fluidized bed gasifier must be cleaned by removing acid gas, such as H₂S, COS, and CO₂, before going to a F-T(Fischer-Tropsch) process. 0.1Nm³/hr methanol absorption tower were used for simultaneously removing H₂S, COS, and CO₂ from simulated syngas. The pressure of absorption tower was 0-100psia and the temperature was from 0oC to -25oC. Each concentrations of H₂S, COS, and CO₂, in a biomass gasifier were 45ppmv, 5ppmv, 18vol%, respectively. In these experiments, H₂S, and COS adsorption ratio was up to 99.5%, and CO₂ adsorption ratio was 38% to 51% at various operation conditions.