按照工藝分類:物理精煉和化學精煉。

Classified by process:physical refining and chemical refining.

化學精煉:通用型。

Chemical refining:general type.

物理精煉:對膠質含量少、酸價高油脂比較實用，如潲水油、地溝油、米油等。

Physical refining: lt is more practical for oils with low gum content and high acid value, such as water oil.

gutter oil, rice bran oil. etc.