This process is characterized by twice cooling, twice oil-water separation, proper heating and then filtering. The advantages of secondary cooling separation are that it can improve the heat transfer coefficient, save cooling water and completely separate oil and water. After the first cooling by the condenser 4, most of the oil and water are condensed into droplets, and the droplets reach a high concentration, so it is suitable for separation by a cyclone separator. The droplets condensed for the second time are small and few, and can only be caught by a screen separator. Groundwater or ice water can be used to cool down, the first cooling is below 35℃, and the second cooling is around 20℃. After removing oil and water in this way, the humidity of the air is still 100%, then it is reduced to about 50% by heating, and then filtered and sterilized. Usually heating to 35℃ can achieve the goal.
In addition to the above-mentioned general filtration system, for the sake of safety, each seed tank and fermentation tank is also equipped with a sub-filter, which is a thin-layer filter plate or filter paper for sterilization. The air input by the main filter enters tangentially from the middle of the cylinder, and the droplets entrained by the air are partially separated due to cyclone action. After further coarse filtration and separation of the liquid droplets through a screen (or other filter media), the liquid droplets are input into the fermentor through a sterile filter layer. The sterilization filter layer consists of two layers of silk screen and linen with three layers of superfine fiber filter paper sandwiched between them. The purpose of using three-layer filter paper is not to improve filtration efficiency, but to prevent short circuit after one layer is broken down. The filter paper should be hydrophobic Ju filter paper, which can resist repeated sterilization of oil, water and steam. Before each batch of fermentation, the sub-filter must be sterilized together with the fermentation tank (or seed tank).
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