Extraction technique of linseed oil

The extraction techniques of linseed oil were compared.Results indicated that the extraction rate of cold compression was 32.36%.The rate was 29.13% under the optimal extraction condition of distillation-petroleum ether was solvent,80℃,ratio of solid and liquid was 1∶6(M/V).The rate was 36.70% by Supercritical CO2 extraction with 25 L/h flow rate of CO2,30 Mpa,30℃ and 2h.The distillation is not good in practice because of solvent residue;low cost of cold compression can meet the requirements of cooking oil;Supercritical CO2 extraction can get high quality linseed oil that can be used as materials of health care food,and the extraction rate is high as well,but the cost is high.