This is optional stage in refining which is considered after client discussion.
Once all the above processes are done with, dewaxing of oil is begins. This is done by cooling tower water followed by chiller. In the crystallizer, sufficient time is spent for crystal growth. Once the waxes get crystallised, the oil is now subject to filtration. This dewaxed oil passes the cold test which gives clarity to oil even at low temperatures.
This process is used to remove the wax by cooling the oil down to prescribed temperatures. This then forms the wax crystal and membrane filter. Although this process is easy, the design of the crystallizer plays a very important role. When chilled or stored for long periods of time, Sunflower, Corn, Canola and Rapeseed oils contain non-triglyceride compounds that create a haze or wax in the oil. Dewaxing/Winterization is the process of chilling followed by filtration that removes these compounds.
Ferro dewaxing section includes - oil retention tanks with agitator , chiller, filter press, storage tanks for dewaxed oil, press oil, cloudy oil & chilled water, PHE & few more.