预处理去除的是油脂中的杂质、水分等，不是去除油脂；而最后蒸馏的作用是物

Pretreatment removes impurities, moisture, etc. in grease, not grease; and the function of final distillation is to physically react to change the product oil, cut and separate different carbon chain structures, densities and colors, and obtain different index qualities

Pretreatment removes impurities, moisture, etc. in the grease, not the removal of grease, and the final distillation is the role of physical reaction to change the finished oil, cutting and separating different carbon chain structure, density and color, etc., to obtain different indicators of quality.

Pretreatment is to remove impurities and moisture in the oil, not to remove oil; and the role of final distillation is to change the product oil by physical reaction, cutting and separating different carbon chain structure, density and color, etc., to obtain different index quality<br>