木质素磺酸盐电化学氧化的低相对分子质量产物的初步研究

Primary Study on Low-molecular-mass Products from Electro-oxidation of Lignosulfonate

用PbO2电极在碱性条件下进行木质素磺酸盐电氧化降解研究，温度25℃，电流密度50-70mA／cm^2，电压0．8～2．0V。电氧化产物经分离，用高效液相色谱分析。结果表明，木质素磺酸盐电氧化降解为香兰素、紫丁香醛、丁香酸、对羟基苯甲醛、苯乙酮、苯甲酸等6种低相对分子质量化合物。

Electroxidation of lignosulfonate in aqueous alkaline solution using lead dioxide electrode was carried out at temperature 25℃, electric current density 50 - 70 mA/cm^2 and voltage 2.0 - 2.5 V. Degradation products were extracted from the aqueous solution and analysed through HPLC. Results show that lignosulfonate is cleaved electrolytically into 6 low-molecularmass products, namely： vanillin, springaldehyde, syringic acid, 4-hydroxybenzaldehyde, acetophenone and benzoic acid.