The video shows us the workshop of low temperature cold filtration. Low temperature cold filtration is the process of filtering out various colloidal impurities such as phospholipids in crude oil. The principle of this process is that according to the different melting points of colloidal molecules such as phospholipids and oil molecules, when the temperature of the crude oil gradually decreases to a certain temperature, the colloidal molecules with higher melting points are first crystallized and precipitated. It cannot be trapped and separated from oil molecules by filter cloth.