1. Raw material selection. Selection of good garlic without insect infestation, no mold lesions.

2. Pretreatment. Peel the garlic cloves and rinse them with water. Then, drain the water and send it to dry in the hot air oven at 65--75℃.

3. Crush. Put the dried garlic cloves into the pulverizer, crushed into powder.

4. Leaching. Garlic powder into a sealed container, and injected into the preheated to 65 - 75 ℃ ethanol, stirred thoroughly for immersion. The amount of ethanol, 4 - 6 times the weight of garlic powder. By soaking, the infusion was filtered out.

5. Vacuum concentration. Filtered leachate, put into the vacuum tank, low temperature vacuum concentration, you can get crude garlic oil. Concentration, temperature control at 40 - 50 ℃, the vacuum degree of 77300 - 101300Pa (Pa). Care should be taken to recover the ethanol solution during the concentration process.

6. Purification. In order to remove the crude garlic oil in the gum, protein and other impurities, can be in the crude garlic oil directly into the water vapor for 4 - 10 minutes, and then centrifugal separation, take the surface layer of the oil, and then dehydration, that is, the finished product of garlic oil. After quantitative packaging and labeled with trademarks, it can be boxed for export. Under normal circumstances, the oil yield of garlic oil made from garlic is 1.6% - 3%.