吸附法降低食用油脂中缩水甘油酯的含量及其动力学研究

A Method to Remove Glycidyl Esters after Refining by Adsorbent Materials and Its Kinetics

摘要:

本文研究了一种用吸附的方式高效地脱除食用油脂中缩水甘油酯（GEs）的方法。结果表明，实验所选的10种吸附剂对GEs均有一定的吸附作用，其中，食用油专用活性炭H-1（AC1）的吸附能力最强，棕榈油经AC1吸附后GEs的含量由3.77 mg/kg降至0.15 mg/kg，其脱除率高达95.92%；吸附条件对吸附效果均有一定的影响，添加量为1%~5%时均有较好的吸附效果，最佳的吸附时间为30 min，吸附温度为80~100 ℃；吸附对油脂的品质没有影响，经AC1吸附的棕榈油的诱导时间为19.35 h，氧化稳定性有所提高；借助吸附动力学方程研究活性炭和凹凸棒对GEs的吸附机理，研究发现它们对棕榈油中GEs的吸附过程都更符合准二级吸附动力学模型，说明它们都发生了化学吸附，而不只是简单的物理吸附。

Abstract:

A way to remove glycidyl esters (GEs) by adsorbent materials after refining was studied. Results showed that all the adsorbent materials chose in this work had a positive effect on the removal of GEs. Among these, AC1 had the best adsorption capacity, and GEs contents was decreased from 3.77 mg/kg to 0.15 mg/kg after the treatment with AC1. Its adsorbent rate was 95.92%. Adsorbent conditions also had great influences on adsorption efficiency. The most suitable amounts of adsorbent was 1%~5%, and the optimal absorption time and temperature were 30 min and 80~100 ℃, respectively. Results also showed that there were no adverse effects but even a slight improvement for oil quality after adsorption, and the induction time of palm oil treated with AC1 was increased to 19.35 h. In addition, by using adsorption kinetics to study the absorption mechanism of AC1 and KD, both materials accorded with the pseudo-second-order kinetics, indicating that they all happened to chemical adsorption, not just physical adsorption.