Cryogenic Bubbling Purification of Vegetable Oils from Impurities

Abstract

The device, the principle of operation and the test results of the apparatus for cryogenic freezing of oils designed to isolate impurities characterized by a high-melting state under atmospheric environmental parameters are considered. It was found that in the mode of extracting wax substances and phospholipids with an average rate of bubbling nitrogen vapor through an oil layer w = 2.2 m/sec, the best results for extracting impurities of wax substances and phospholipid compounds with a high-melting structure are obtained. At a higher rate of bubbling nitrogen vapor through an oil layer (w = 2.5 m/sec or more), the freezing process is carried out with a high cooling rate, which adversely affects the nature of the high-quality agglomeration of high molecular weight impurities containing waxy and phospholipid fractions, and the final filtrate of frozen-out oil does not fully meet the requirements of the standard for physicochemical parameters.