Corn germ accounts for 7%~14% of the whole corn kernel, the germ contains 36%~47% of oil, only the corn germ can be extracted oil, if your raw material is corn then you need to separate the corn and germ, corn germ separation is generally three methods, dry, wet and semi-wet method.
Dry method: corn is not adjusted for moisture, machinery for extrusion, crushing, etc., after which the corn husk, germ and endosperm will be screened and separated, this technology is simpler, low energy consumption, non-polluting; however, the dry method of extracting endosperm is not efficient, and some of the germ can not be separated from the endosperm.
Wet method: The corn is soaked in water, and after soaking the corn is crushed and de-sterilized, after which the germ and starch are separated by a rotary liquid separator. The germ must be dried after extraction because the moist germ is prone to deterioration. This method consumes more energy, causes some pollution to the environment, and has high investment and production costs for machinery and equipment.
Semi-wet method: The germ and endosperm of maize have different water content and water absorption, and the elasticity, toughness and crushing strength of both are changed after absorbing water. Using this feature will be half-wet corn for crushing, peeling and sterilizing and then separated by press flat sieve, endosperm and germ will be sorted effectively. The method has low energy consumption, no pollution, low investment in equipment and low production cost.
After getting the germ, you can extract the corn germ oil, which can be extracted by physical pressing method and solvent extraction method. Large-scale oil factories usually use solvent extraction to extract corn germ oil, and the pressing method is suitable for small and medium-sized oil extraction factories, which can meet the production tasks by using screw oil presses.
Siwei engineering company is committed to provide corn oil production and refining solutions, including corn oil production layout design, corn oil production machinery manufacturing, commissioning and installation, etc., welcome to inquire at any time.
