Refining process of general edible oil
1. Process flow of national standard grade II oil (raw oil with light color, acid value less than 4 and no pollutants) (I)
Desolvation
Crude oil --- filtration --- hydration degumming --- vacuum drying --- secondary edible oil
2. Process flow of national standard grade II oil (raw oil is crude oil with poor quality and contaminant) (Ⅱ)
Desolvation
Crude oil --- filtration --- alkali refining and deacidification --- water washing --- vacuum drying --- secondary edible oil
3. Process flow of national standard grade I oil
Desolvation
Crude oil --- filtration --- alkali refining and deacidification --- water washing --- vacuum drying --- secondary edible oil
Refining process of high grade edible oil
1. Process flow of refined edible oil (including high grade cooking oil and salad oil)
Dewaxing
Crude oil --- filtration --- degumming --- deacidification --- vacuum drying --- decolorization --- deodorization --- filtration --- refined edible oil
2. Process flow of refined cold meal oil (salad oil)
Crude oil --- filtration --- degumming --- deacidification --- vacuum drying --- decolorization --- deodorization --- degreasing --- refined cold meal oil
Refining process of food special oil
┌ - → transesterification → -
Crude oil → filtration → degumming → deacidification → dehydration → decolorization → hydrogenation → post decolorization → fractionation → deodorization
↓
Special oil for food
