用稻米壳灰和活性土给大豆油脱色的紫外-可见吸收光谱的研究

Study on UV-vis Absorbance Spectra of Soy Oils Bleached with Rice Hull Ashes and Clays

探索了用不同的稻米壳灰和膨润土给大豆油脱色的方法 ,提出了脱色油的紫外 -可见吸收光谱。光谱表明 ,用稻米壳灰或膨润土脱色是物理吸附过程 ,并且显露 ,在氮气流中用稻米壳灰给大豆油脱色比在空气流中效果更好。用酸活化了的稻米壳灰比不被活化的有着更强的脱色能力。而且发现未清洗的被酸活化的稻米壳灰的脱色能力比被清洗的脱色能力更强。

Soy oil was bleached with different rice hull ashes and clays. UV-vis absorbance spectra of bleachedoils were presented. The spectra indicated that the bleaching with rice hull ashes or clays were of physical adsorption. It also revealed that the bleaching with rice hulls ashed in nitrogen stream was generally more efficient than those with rice hulls ashed in air stream. Acid activated ashes showed higher bleaching capability than unactivated ones. Moreover, unwashed activated ashes were found to be more effective in bleaching than washed ones.