Optimal Synthesis of Aromatic Carbonyl Compounds by Electrooxidation of Soda Lignins on Stainless steel and TiMMO Anodes

Electrooxidation (EO) studies were conducted on Wheat Straw Soda Lignin (WSSL), and bagasse soda lignin (BSL) for the synthesis of aromatic carbonyl compounds (COarom). Stainless Steel (SS), and titanium mixed metal oxide (TiMMO) anodes were used for the purpose. Experiments were designed according to Box Behnken Design (BBD), and Central Composite Design (CCD). The process parameters, namely EO current density, and EO time, were optimized using Response Surface Methodology (RSM) to obtain the maximum yields of different COarom, individually as well as collectively. A maximum of ۳۰% cumulative yield of COarom, based on the total amount of lignin, could be obtained from BSL under optimized conditions of ۲.۲۴ mA/cm۲ EO current density, and ۱۸ h EO time using SS anode. Among individual compounds, vanillin was produced with the highest yield of ۲۰% of starting BSL with EO current density, and EO time optimized to ۵.۸۷ mA/cm۲, and ۱۸ h, respectively. In all cases, SS anode fares better than TiMMO anode.

کلیدواژه ها:

Electrooxidation ، soda lignin ، aromatic carbonyl compounds ، Anode ، Response surface methodology