JPH047359B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for separating sterine compounds from deodorized distillate produced as a by-product in the deodorizing process of fats and oils. Deodorized scum, deodorized sludge, hotwell oil soapstock, etc. (hereinafter referred to as deodorized Sterolins, hydrocarbons, tocopherols, glycerides, free fatty acids, etc. coexist in the distillate (referred to as distillate). These deodorized distillates contain about 1 to 35% of sterine compounds, which are used as cosmetic bases due to their emulsion-stabilizing effects and moisturizing properties on the skin, and as a resource for the synthesis of various steroid hormones. It is thought that it can be used for pharmaceutical synthesis, and shrimp,
It is used as a feed additive for eels, silkworms, etc. In addition, tocopherols, which are contained in the deodorized distillate in an amount of about 0.1 to 20%, are useful substances as medicines, foods, or antioxidants. In general methods for obtaining tocopherol concentrates from deodorized distillates, it is often difficult to process the tocopherols while they still contain sterins. Therefore, it is necessary to first separate the sterins. Generally, there are four methods that can be applied to industrial processing to separate sterolins: 1) Solvent fractionation crystallization method, 2) Dibasic organic acid adduct method, 3) Urea adduct method, and 4) Metal chloride adduct method. Conceivable. Among these methods, in the solvent fractional crystallization method, the operation to separate the precipitated sterine crystals is usually carried out by ultracentrifugation (centrifugal effect of 3000 or more) or furnace filtration, but the equipment used for these operations is The disadvantages are that it is large in size and that it is often difficult to handle the separated sterins. Furthermore, when performing these separation operations, it is necessary to use a solvent in an amount 15 to 30 times that of the deodorized distillate due to the separation characteristics of sterolins. However, in the presence of fatty acids, sterine compounds have a certain degree of solubility in solvents, so if sterine compounds remain in the deodorized distillate after the separation process, they will precipitate in the subsequent process and have an adverse effect. Often, for example, when methanol is used as a solvent, the solubility of sterins in the presence of fatty acids is about 2%, and the greater the amount of solvent used, the greater the amount of sterine remaining. Therefore, the precipitation of sterine compounds in the post-process can be prevented by adding a third component such as hexane, toluene, or xylene, but in this case, the solvent recovery equipment becomes complicated because multiple solvents need to be recovered. . An object of the present invention is to provide a method for separating sterine compounds in a deodorized oil and fat distillate, which can reduce the amount of solvent used in fractional crystallization and efficiently separate sterine compounds using a small-sized separation device. It's about doing. That is, the method for separating sterine compounds in a deodorized distillate of fats and oils according to the present invention involves performing a separation operation when separating sterine compounds in a deodorizing distillate produced as a by-product in the deodorizing process of fats and oils by a solvent fractional crystallization method. The method is characterized in that it is carried out in two stages: a first stage of centrifugal sedimentation using a basket-type centrifugal sedimenter, and a second stage of centrifugal filtration using a basket-type centrifugal filter. In the present invention, the separation operation of sterolins is carried out by
It is composed of centrifugal sedimentation and centrifugation, either alone or in combination, but in order to concentrate and isolate sterins, these centrifugal sedimentation and centrifugal filtration operations are combined. In order to obtain a sufficient effect and further take advantage of the features of these unit operations, it is preferable to combine centrifugal sedimentation and centrifugation in this order to constitute the basic part of the separation operation. In this way, the separation operation performed by a combination of centrifugal sedimentation and centrifugation makes it possible to separate sterenes with high efficiency using a small amount of solvent, and the equipment used for each unit separation operation can be made smaller. In addition, the work is simplified, and the isolated sterins are extremely easy to handle. Furthermore, in order to further improve the recovery rate of sterins and other components in the deodorized distillate, multiple combinations of centrifugal sedimentation and centrifugation, and other operations such as solid content washing may be added. . A preferred embodiment of the method of the present invention can be exemplified by the separation method shown in the flow sheet below.

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Claims (1)

[Claims] 1. When separating sterine compounds in the deodorized distillate produced as a by-product in the deodorizing process of fats and oils by a solvent fractional crystallization method,
In an oil and fat deodorized distillate, the separation operation is carried out in two stages: a first stage of centrifugal sedimentation using a basket-type centrifugal sedimenter, and a second stage of centrifugal filtration using a basket-type centrifugal filter. Method for separating sterolins. 2. The method for separating sterins in a deodorized fat and oil distillate according to claim 1, wherein the solvent is an aliphatic alcohol having 1 to 4 carbon atoms, an aliphatic carboxylic acid ester, an aliphatic ketone, or a mixture thereof. 3. The oil and fat deodorizing distillation according to claim 1, wherein the centrifugal sedimentation is carried out using a basket-type centrifugal sedimenter at a centrifugal effect of 1000 to 1500, and the centrifugal filtration is carried out using a basket-type centrifugal filter at a centrifugal effect of 700 to 900. A method for separating sterine compounds in substances.