Freundlich方程在油脂脱色体系中的应用及其返色研究

Applications of Freundlich Equation in Oil Bleaching Process and Its Color Reversion

采用活性白土与凹凸棒土复配对油脂脱色,以脱色率为指标,通过单因素试验和Freundlich方程对脱色条件进行优化,确定最佳的工艺条件。结果表明:优化后的最佳工艺条件为脱色剂用量1.9g/100mL、脱色时间40min、脱色温度110℃、脱色剂活性白土与凹凸棒土的复配比例为2:3,在该条件下油脂脱色率为85%。并将不同比例复配的活性白土与凹凸棒土脱色后的大豆油分别进行一定时间的105℃加热实验,测定在不同时间的吸光度并进行比较,结果显示,在吸附剂添加量为1.7g/100mL时,凹凸棒土的添加比例越多,油脂越稳定,不易返色。

Soybean oil was bleached by using activated clay and attapulgite clay together in different ratios. One-factor-ata- time experiments and Freundlich equation were adopted to optimize the decolorization process. The optimal conditions for decolorizing soybean oil were established by adding 1.9 g/100 mL of a mixture of activated clay and attapulgite clay at a ratio of 2：3 to soybean oil and then incubating at 110 ℃ for 40 min. Under these conditions, the decolorization efficiency of soybean oil was 85%. The absorbance of soybean oil samples decolorized with different ratios of activated clay to attapulgite clay was compared with each other after heating treatments at 105 ℃ for different durations. The results observed showed that increasing the proportion of attapulgite clay when the total amount of adsorbents was kept at 1.7 g/100 mL stabilized oil lipids and hence avoided color reversion.