Search

To remove NO in flue gas, complex solution denitration is one of the most effective methods at room temperature. NO removal efficiency is related to the concentration of metal ions and ligands in the absorption solution. The experiments to remove NO in simulated flue gas were carried out by using iron complexation with EDTA disodium salt and sodium citrate as ligands. The NO removal efficiency was determined by mixing ammonium ferrous sulfate, disodium EDTA, and sodium citrate in various ratios. The experimental results revealed a 1:1:1 ratio as optimum for NO removal efficiency and cost-effectiveness of the process. By reducing and regenerating the absorption solution with zinc particles, the regeneration efficiency of Fe(II)L (L represents an amino carboxylic acid ligand) is above 70%, and the NO absorbed by the iron complex is reduced to form nitrogen and ammonium salt. The effects of different factors on the NO removal efficiency during the spraying process were investigated. The optimum conditions of...

The aim of this work was to investigate the feasibility of a proposed simple bio-oil upgrading technique and test its suitability for bio-oil products. The upgrading technique consisted of vacuum distillation for preliminary water removal, deep water removal, using etylchloride, and catalytic esterification and neutralisation. Two bio-oil samples were produced from slow pyrolysis of sawdust pellets and fast pyrolysis of wheat straw powder. Some activated carbon obtained from slow pyrolysis was the catalyst carrier and p-toluene sulfonic acid was the catalyst. The conditions of the esterification reaction were identified by serious experiments. As a result, the qualities of both bio-oil samples are significantly improved through the upgrade. The heat value of both oils ranged from 14–17 MJ kg−1 to 25–29 MJ kg−1. The final neutralisation step using triethylamine increased the oil pH value close to neutral. The chemical/physical properties of the produced bio-oils were in accordance with the standards for engine fuel.