The production process of rapeseed oil is divided into production and refining process. The production process mainly includes pretreatment, frying seeds and pressing, and the refining process is mainly includes rapeseed oil filtration, washing and desolation drying. In order to maintain the rich fragrance of rapeseed oil, the Filtration System of rapeseed oil refining process is generally composed of leaf filter, plate filter and bag filter housing. Let's take a look at how rapeseed oil filtration system filter rapeseed oil.
The pressed crude oil is initially deslagged by the oil tank and then pumped into the leaf filter for filtration, and the filtered oil is then sent by the pump to the cooling pan. After cooling to a certain temperature, it will be pumped into an oil tank with cooling coils and refrigerate for 3 days.
The settled rapeseed oil has great transparency due to the separation of some of the phospholipids that have been polymerized, and also further improves the stability of the storage. Then plate filter was used to filter the static rapeseed oil. The filter media of the plate filter is generally adopted 1 layer filter cloth and 1 layer industrial filter paper or absorbent cotton.
Bag filter system is mainly used to remove a small amount of little activated carbon particles left in oil after being filtered by plate filter. Because rapeseed oil belongs to edible oil, Bag Filter Housings generally adopts sanitary stainless steel material with internal and external polishing.
Generally, PP Liquid Filter Bags with filtering accuracy of 1 or 5 microns are selected as the filter consumable, or High Flow Pleated Bag Filters specially designed to replace the liquid filter bags are selected. Compared with liquid filter bag, it has larger surface filtration area, greater loading capacity and higher filtration efficiency.
Because rapeseed oil is an non-dry vegetable oil and contains a high proportion of unsaturated fatty acids, it is relatively easy to spoil. In order to prevent the finished rapeseed oil from deteriorating, it is generally adopted to add cooling water coils directly in the tank and keep the storage temperature of rapeseed oil under 20 degrees Celsius.