Field of the Invention. This invention relates to the field of vegetable oil refining technologies, more particularly, to the technology of wax removal from vegetable oils by freezing out or winterization, and can be used for the improvement of the existing and the development of new technologies. Background of the Invention. Known is a method of wax removal from vegetable oils by winterization comprising slow cooling of oils with the addition of auxiliary filtering powders used to initiate the formation of crys- tallization centers, low temperature exposure of oils and subsequent separa¬ tion of the residue by filtering, said residue being used as forage or disposed off at special disposal sites (Fat Processing Technology, ed. Dr. Sci. Professor N.S. Amtyunyan, Moscow, Pischepromizdat, 1998, pp. 119-121 & 130-131). Disadvantages of said method are that the auxiliary filtering powders (zeolites, kieselgur, filterperlite etc.) used to intensify the separation of waxes have a well-developed surface structure and contain internal pores and capil¬ lary channels the total volume of which may be as high as, for example, 70% of the total volume of the particles, in the case of filterperlites. This results in the high loss of oil that is absorbed by the internal pores and removed with the particles and in the high consumption of the filtering powder because only part of the particle surface is adsorbent for waxes. Furthermore, filtering powders used for this method are not recyclable, and the fatty product ad¬ sorbed by their surface cannot be disposed. Known is a method of wax removal from vegetable oils by winteriza- tion with the use of auxiliary filtering powders (SU 1730129 Al, published 30.04.92, MPK S 11 V 3/10) wherein the used filtering powder is degreased using the technology of oil extraction from oilcake by adding to unfiltered micelle, followed by intense stirring, filtering, extraction of the separated residue and removal of said residue with the extraction cake. Disadvantage of said method is the impossibility of recycling the de- greased filtering powder in the further winterization cycles because of its contamination with the extraction cake (oilcake after oil extraction) and the high contamination of the extraction oil with the wax obtained during the sub- sequent distillation of the micelle, this making the oil a technical grade prod¬ uct only. Known is a method of wax removal from vegetable oils comprising the introduction of a crystallization agent into the oil and the separation of the crystallizing impurities by making the use of the waxes contained in the vegetable oils, wherein the source of said waxes is the used filtering powder obtained during the winterization of the vegetable oils (SU 1822864 Al, pub¬ lished 23.06.93, MPK SI l V 3/10). Disadvantage of said method from the viewpoint of used filtering pow¬ der recycling as the crystallization agent is as follows. Studies have shown that, during winterization, the waxes contained in oil form reticular colloidal structures known as globular jellies without any distinguishable crystalline structures, rather than grain aggregations. The skeleton of these globular jel¬ lies contains up to 90% of the solvent (i.e. the oil), and these jellies are readily adsorbed by the surface of filtering powders without forming multilayered coatings that are typical of crystalline structures, although the stoichiometric number of adsorbed globules per unit surface of the filtering powder is main¬ tained. Therefore the introduction of waxes contained in vegetable oils as crystallization agents is a justified measure that may give positive result within the specified narrow limits, because the structure of the waxes being introduced is other than globular after their separation from filtering powders and concentrating. The introduction of used filtering powders as crystallization agents within the specified narrow limits in addition to the new powders being intra- duced for wax structure filtering intensification purposes increases the degree of wax removal to only a little extent, mainly due to the free surface areas of the particles not occupied by the globules, this being evident from the exam¬ ples presented herein. The introduction of used filtering powder hinders the separation of the phases due to the clogging of the filtering element pores, therefore multiple recycling of used filtering powders without appropriate modification of the physicochemical structure of the particle surface before recycling is impossible.

Disclosure of the Invention. The technical result of the invention comprises providing the possibility of multiple recycling of filtering powders during the winterization procedure with a simultaneous increase in the ad¬ sorption activity of filtering powder particles in relation to wax globules, re¬ duction of the total powder consumption, production of concentrated wax containing fatty products directly from the used residues, and reduction of winterized oil losses due to the clogging of the inner pores of the powder par¬ ticles with the wax containing fatty product. Said technical result is achieved as follows. Separated used filtering product regeneration step is added to the method of wax removal from vegetable oils the working cycle of which com¬ prises winterization of the vegetable oil with the addition of auxiliary filtering powders, low temperature exposure of the oil and separation of the used fil¬ tering powder with the wax containing residue from the refined vegetable oil. To this end the used filtering powder is mixed with the additionally intro- duced fatty product to a paste condition, said paste is heated with stirring to the melting point of all the waxes and the resultant mixture is separated by centrifugation to obtain regenerated dry filtering powder and a wax containing fatty product. The regenerated filtering powder can be multiply recycled as the aux¬ iliary filtering powder in the subsequent working cycles comprising winteri- zation of the new vegetable oil portions wherein each working cycle is fol¬ lowed by regeneration of the used filtering powder. Furthermore, the separated used filtering powder is mixed with the ad¬ ditionally introduced fatty product in a 1 : 0.5 - 3 ratio. Also, the mixture of the separated used filtering powder with the addi¬ tionally introduced fatty product is heated with stirring to 60 - 100 0C. Also, the separated used filtering powder is dried in a centrifuge to a residual concentration of the wax containing fatty product of 10 - 35%. Furthermore, part of the wax containing fatty product obtained by cen¬ trifugation is mixed with the separated used filtering powder as the fatty product additionally introduced during the regeneration step. Also, the excess part of the wax containing fatty product obtained by centrifugation can be sold to third parties. After the regeneration, the inner pores and capillaries of the filtering powder are filled with the wax containing fatty product, and the surface of the particles is coated with a crystalline wax film having a high adsorption activ¬ ity to the waxes removed from the oil during winterization. This effect in- creases the output of winterized oil by the volume of the clogged pores. Because all the inner pores of filtering powder after the first use are filled with raw oil that is supplied for winterization and replaced during the regeneration by the wax containing fatty product, the wax containing fatty product separated by centrifugation during the repeated use of the regenerated filtering powder the wax concentration in which is higher by the volume of the clogged pores than that for the conventional powder. Thus, a new product grade is obtained. Examples. At the Krasnodarsky Oil and Fat Factory, vegetable oil is subject to winterization after the complete cycle of food grade refinement until deodori- zation. Preliminarily cooled vegetable oil is fed in uninterrupted mode to the crystallizer, and Celite-545 grade kieselgur auxiliary filtering powder is fed there from a batching device in an amount of 8-15 kg per ton of the oil fed for winterization. The mixture is cooled down to 4-12°C during 4-8 h. In the ex¬ posure chamber, the waxes undergo aging, and the used filtering powder is subsequently separated with the wax containing residue on the filters. The used filtering powder unloaded from the filters is fed through the residue hop¬ per to the heated mixer to which the wax containing fatty product from the previous regeneration phase is also fed in an amount of 1 : 0.5-2.5 as related to the amount of the used filtering powder selected within the range of values as per Claim 2 hereof. The mixture is heated with stirring to the melting point of all the waxes (75-950C) selected within the range of values as per Claim 3 hereof, the resultant mixture is loaded into a periodic action centrifugal ex¬ tractor, and the wax containing fatty product is removed by centrifugation to the dry condition of the filtering powder (residual concentration of the wax containing fatty product in the particle pores is 20-30% which is within the range of values as per Claim 4 hereof). Using a special device, the regener¬ ated filtering powder is unloaded with slow centrifuge rotation to a cyclone from which it is fed through the batching system to the crystallizer for recy¬ cling. The wax containing fatty product separated by centrifugation is par¬ tially fed through an intermediate receiving chamber for the dilution of new portions of used filtering powder, and the remaining excess wax containing fatty product is sent to the warehouse for selling to third parties as a new grade product. The wax content in the fatty product is 15-45% depending on the composition of the oil being winterized. The method provides for a win- terized oil output of 200 tons/day and allows for a 4-6-fold reduction of fresh filtering powder consumption, a 0.8-1 tons/day reduction of winterized oil losses and obtaining more than 3 tons/day of the new grade wax containing fatty product the wax content of which is 1.2-1.5 times that for direct extrac- tion of used filtering powder. Thus, the method provides for a tangible cost reduction of wax removal from vegetable oils, reduction of environmental pollution by the used filtering powders, increase in process output and obtaining a new grade food product.