大豆油生产加工中色泽控制措施

一些大豆油含特殊杂质和色素,在脱色过程中白土用量过高,成品油氧化稳定性差。为了防控大豆油制取和精炼过程中色泽加深,降低白土用量,可采取不同的措施:预处理过程中调整参数让部分色素固化,浸出过程中采取多级过滤,降低蒸发和汽提温度,改造汽提塔结构以减少加工色素;精炼过程依据小样实验取得毛油品质数据调整操作参数,对部分脱色设备进行改造。生产精炼包装油按酸价(KOH) 0. 05 mg/g,色泽Y5～6/R0. 5～0. 6;散装油酸价(KOH) 0. 07～0. 08 mg/g,色泽Y7/R0. 7。储备大豆油和酸价(KOH) 2～3 mg/g毛油的脱色白土消耗量在原17～24 kg/t的基础上平均降低30%,包装油的货架期也明显延长。

Controlling measurements of color during soybean oil production

Some soybean oils contain special impurities and pigments, resulting in excessively high amount of clay during bleaching and poor oxidation stability of the finished oil. In order to prevent the deepening of the color during the preparation and refining of soybean oil, and reduce the amount of clay, different measures could be adopted, such as adjusting the parameters during the pretreatment process of soybean to cure partial pigments, reducing the processing pigments during solvent extraction by adopting multi-stage filtration, decreasing the evaporation and stripping temperature and modifying the structure of the stripping tower, adjusting the operating parameters according to the crude oil quality obtained from the small sample experiments, and modifying some bleaching equipment. The fininshed oil standard were acid value 0.05 mgKOH/g and color Y5-6/R0.5-0.6 for packaging oil,and acid value 0.07-0.08 mgKOH/g and color Y7/R0.7 for bulking oil. Consumption of decolorized clay for soybean oil and 2-3 mgKOH/g crude oil decreased by an average of 30% on the basis of 17-24 kg/t. The life-shelf of the packaged oil obviously prolonged.