Deacidification technology of Cyperus esculentus oil by solvent extraction
The acid value of Cyperus esculentus oil which was extracted by mechanical pressing was high, and not easy to be preserved. Cyperus esculentus oil was deacidified by solvent extraction. The optimal deacidification conditions was obtained through single factor and orthogonal experiments, and the results showed that extraction times was 3 times, extraction temperature was 35 ℃, the volume ratio of Cyperus esculentus oil to ethyl alcohol (v/v) was 1:3. Under these conditions, the acid value of Cyperus esculentus oil was reduced to 0.523 mg KOH/g.