Ginger has a large area of ​​cultivation in China and its total output is quite high. However, due to improper storage methods of fresh ginger, it causes a lot of waste. If ginger is processed into ginger oil, the economic benefits can be increased by 3-5 times. The use of distillation method to extract ginger oil is simple and the equipment used is not very demanding. The majority of township enterprises and more powerful rural private enterprises can use it. The following describes the principle of distillation ginger oil extraction and specific extraction process. First, the extraction principle The use of ginger oil volatile and water insoluble, the use of steam distillation of ginger oil, after cooling, oil and water separation, that is, ginger oil products. Second, the equipment tunnel dryer (or drying room), grinder, steamer, cooler, oil-water separator. Third, the extraction process points 1, the raw material pretreatment No worm rot, no mildew, no sprouts of fresh ginger as a raw material, remove roots, with a knife cut into 4-5 mm thick ginger. Note that raw materials must not be rotted or deteriorated, otherwise it will affect the quality of ginger oil. 2. Bake ginger slices at 60-65°C for 6-8 hours to reduce the moisture content of fresh ginger slices to below 12%. It can also be placed on bamboo curtains for 5-6 days. Generally, 12.5 kilograms of dried ginger are made per 100 kilograms of fresh ginger slices. When drying, pay attention to the temperature is not too high; if it is dried, it should not be exposed; ginger can not be too dry. Otherwise, some ginger oil will volatilize and the yield of ginger oil will decrease. 3. Crush the dried ginger slices into rice-like ginger powder with a grinder and pass through a 20-mesh sieve. Ginger powder can not be too thick, too thick to affect the oil; nor too fine, too fine water vapor is not easy to penetrate. 4. Distill and cool. Prepare a stainless steel steamer. Place the steamer in the steamer. Spread a layer of gauze on the rice dumpling and loosely spread the ginger powder on the gauze. The surface of the ginger powder and the upper layer of rice dumplings should retain a certain amount of space for water vapor penetration. After installing the ginger powder, connect the distillation tube of the steamer to the cooler, pay attention to maintain the height difference between the inlet and outlet of the cooler, the import should be high, and the export should be low. This constitutes a set of distillation cooling equipment. The steam is blown under the steamer to maintain the steam pressure at 0.12-0.13 Mpa. In this way, the steam passes through the ginger powder, the ginger oil in the ginger powder vaporizes due to the high temperature effect of the steam, and the water vapor enters the cooler through the distillation pipe, and the water vapor and the vaporized ginger oil are cooled in the cooler to form an oil-water mixture. 5. The oil-water separation oil-water separator collects the oil-water mixture at the cooler outlet. After standing, the oil-water mixture is automatically separated. The upper layer is ginger oil and the lower layer is water. The use of a separator to remove the lower layer of water results in a ginger oil product. The yield of this method is generally: 100 kilograms of ginger powder can extract 3-4 kilograms of ginger oil. (100094 Wang Yihua, China Agricultural University)
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