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为了探讨互贯网络树脂（PDVB/PGMT）吸附木糖母液中色素的动态穿透特征，研究了流速、温度、初始浓度及床层高径比等对色素吸附过程的影响规律，讨论了糖组分及色素的传质机制。结果表明，互贯网络树脂对木糖母液中的色素有选择性吸附的特征，其吸附行为符合Henry模型。平衡扩散模型适合描述色素和糖组分的动态穿透行为。高流速下组分的传质由轴向扩散主导，轴向扩散系数显著增大。初始浓度增加，组分穿透过程加快，组分的穿透体积相对稳定。高径比增大延长了溶质的停留时间，穿透体积增大，会加剧轴向扩散效应。PDVB/PGMT树脂对木糖母液脱色的较佳工艺条件是：流速1 mL/min、初始色素吸光度0.68、木糖浓度185 mg/mL、床层高径比6.4∶1。在此条件下，PDVB/PGMT树脂对色素的吸附容量为19.71 mg/g。总糖损失率较低，树脂的复用性能较佳。
Abstract：To explore the dynamic penetration characteristics of pigment during adsorption from xylose mother liquor by interpenetrating polymer network(IPN) resin(PDVB/PGMT),the effects of flow rate,temperature,initial concentration,and bed height-to-diameter ratio on the adsorption process were studied. The mass transfer mechanisms of both sugar components and pigments were analyzed. The results showed that the IPN resin exhibited selective adsorption towards pigments,and its adsorption behavior followed the Henry isotherm model. The equilibrium diffusion model was suitable to describe the dynamic breakthrough behavior of both pigments and sugar components. At higher flow rates,the axial diffusion became the dominant mass transfer mechanism,resulting in a significant increase in the axial diffusion coefficient. As the initial feed concentration increases,the breakthrough process accelerated,although the total volume remained relatively stable. Increasing the height-to-diameter ratio of resin bed extended solute retention time and enhanced the breakthrough volume,thereby intensified the axial diffusion effect. The optimal decolorization conditions for xylose mother liquor using PDVB/PGMT resin were established as follows :flow rate of 1 mL/min,initial pigments absorbance of 0.68,xylose concentration of 185 mg/mL,and bed height-to-diameter ratio of 6.4:1. Under these conditions,the adsorption capacity of the resin for pigments reached 19.71 mg/g. The total sugar loss rate was low,and the resin demonstrated good reusability.
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基本信息:
DOI：10.19804/j.issn1006-2513.2025.11.006
中图分类号:TS264.4
引用信息:
[1]魏麒,张军伟,贾彩敬.互贯网络树脂吸附木糖母液中色素的动态穿透特征[J].中国食品添加剂,2025,36(11):41-47.DOI:10.19804/j.issn1006-2513.2025.11.006.
基金信息:
江苏省博士后基金项目(编号：1601073B); 江南大学自主科研计划重点项目(编号：JUSRT51720B)