Method for winterizing (dewaxing) of vegetable oils

摘要

A method for winterizing (dewaxing) of vegetable oils is described. The method is of an art, comprising the steps of neutralizing the oil, chilling it, mixing in an alkali solution, slow stirring during a residence time to make waxes and other high melting matters precipitate, and removal of same.PPThe present method is especially characterized by the fact that the neutralizing is driven to a soap content of 100-7000 ppm, and that the oil is chilled to a temperature below 15 C., preferably 5-15 C., and that lye or other alkali is added, corresponding to 0.01-0.06 kgs NaOH per 100 kgs oil, the sequence chilling/addition being optional, whereupon 3-10 kgs water per 100 kgs oil are added with intense agitation, and the mixture so obtained is stirred slowly for more than 1 hour, preferably 1-7 hours, whereupon the mixture so obtained is separated into a heavy fraction, containing water- lye- soap- waxes- and other high melting matters and a lighter fraction consisting of the winterized oil.