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Wheat straw soda lignin was subjected to thermochemical (TC) pretreatment at low tomoderate temperatures followed by electrooxidation (EO) on an SS-304 anode to produce somevalue-added organic chemicals. The influence of independent process variables on theproduct yield of major organic chemical groups, namely, aromatic carbonyl compounds(CO arom ), aromatic hydrocarbons (HC arom ), and aliphatichydrocarbons (HC aliph ), was studied. Response surface methodology (RSM) wasused to optimize the process conditions for maximizing the amount of chemical productionaccording to the Box-Behnken experimental design (BBD). For CO arom , the optimalconditions were 2 h TC pretreatment at 200°C followed by 12 h of EO at 2.24 mAcm −2  current density to yield 24.7% of desired products. The optimizedsynthesis conditions for HC arom  are 2 h TC treatment at 200°C yielding16.1% desired products. As individual compounds, vanillin, acetosyringone, syringaldehyde,acetovanillone,  o -xylene and toluene were significantly produced indifferent product groups. A small amount of organosilicon compounds (ORG Si ) andHC aliph  was also produced.

holzforschung

Process optimization of lignin conversion into value added chemicals by           thermochemical pretreatment and electrooxidation on a stainless steel           anode