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为有效降解并利用木质素及其衍生物,研究了采用不同起始浓度和反应温度的过氧乙酸(PAA)溶液对木质素磺酸钠(SLS)降解率的影响,并分析了SLS在处理前后分子结构的变化。研究表明,在温度为80℃的条件下,用起始浓度为50 g/L PAA溶液处理SLS 10 h,降解率可达76.6%。仪器分析结果表明,在PAA的作用下,木质素磺酸钠的苯环结构被破坏,产物中—OH含量减少,而C—O和C O结构增加,SLS中的部分磺酸基团被氧化为SO42-,氧化产物中存在CH3—CO—、R1—CH2—O—R2和R1—SO2—R2结构。
In order to effectively degrade and utilize lignin and its derivatives, the effects of solution of peracetic acid (PAA) with different initial concentration and reaction temperature on the degradation rate of sodium lignosulfonate (SLS) were studied. The effects of SLS treatment Changes in molecular structure before and after. The results showed that the degradation rate of SLS reached 76.6% at a temperature of 80 ℃ for 10 h with initial concentration of 50 g / L PAA solution. The results of instrumental analysis showed that under the action of PAA, the benzene ring structure of sodium lignosulfonate was destroyed, the content of -OH in the product was reduced, while the structure of C-O and CO was increased. Some sulfonic acid groups in SLS were oxidized to SO42-, the oxidation products exist CH3-CO-, R1-CH2-O-R2 and R1-SO2-R2 structure.