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The most crystal clear refined oil
Winterising is an operation designed to preserve limpidity and refined oils brightness.
It consists in removing from these oils, mainly maize and sunflower, small quantities of solids that cause cloudiness when the oil is kept at low temperature.
These solid substances can be saturated glycerides or waxes. Waxes are esters of fatty alcohols and fatty acids, which have a very low solubility in oils.
Thanks to the relatively small amount of solids – between a few hundred and 2000 ppm – winterising is a continuous and, therefore, cost-effective process.
In order to obtain an oil with good stability, the wax content needs to be reduced to a level of less than 10 ppm.
To achieve this, the variables of time, temperature and agitation require special care to produce oil in a closely controlled range.
The process is conducted in four steps:
• The oil is precooled in heat exchangers
• Filter aid is added just before the first crystalliser, and the oil is cooled very slowly, in a minimum of 6 hours, a prerequisite for gentle crystallisation;
• The crystallised oil stays 6 hours in the maturator, at fi nal cooling temperature;
• The oil is then filtered in horizontal hermetic leaf filters, generally precoated with filter aid. The oil temperature is often raised just before filtration, to reduce viscosity and hence facilitate filtration.
n One single plant only for dewaxing & winterising
n Perfect cold stability : at least 72H at 0°C n Two-step filter aid dosage : minimal
n Gradual cooling : reduced filter aid consumption
n Fully closed process : no oil oxidation
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