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首页> 外文期刊>Russian Journal of Physical Chemistry >Ozone reactions with lignins at various pH values
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Ozone reactions with lignins at various pH values

机译：臭氧在不同pH值下与木质素的反应

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摘要

The influence of pH on the kinetics of ozonization of aqueous solutions of sodium lignosulfonate (LS) in a bubbling reactor was studied. The effective rate constants and stoichiometric coefficients of the reaction between ozone and LS were determined. The influence of pH on the effective rate constants and the amount of ozone consumed was characterized. The stoichiometric coefficients were shown to change from 1.3 to 5.6 as pH increased from 1.0 to 8.6. Simultaneously, the effective rate constants changed severalfold. The transformations of solid lignin and aqueous solutions of LS were studied by UV and C-13 NMR spectroscopy. The main stages of lignin ozonization were determined, and a mechanism for the reaction is suggested.
机译：研究了pH对鼓泡反应器中木质素磺酸钠（LS）水溶液臭氧化动力学的影响。确定了臭氧和LS之间反应的有效速率常数和化学计量系数。表征了pH对有效速率常数和臭氧消耗量的影响。随着pH从1.0增加到8.6，化学计量系数显示从1.3改变为5.6。同时，有效速率常数变化了几倍。通过UV和C-13 NMR光谱研究了固体木质素和LS水溶液的转化。确定了木质素臭氧化的主要阶段，并提出了反应机理。

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