JPS601358B2 - Separation method of cottonseed stearin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for improving the filtration properties during fractionation of cottonseed stearin, thereby collecting low melting point components or liquid components with good yield.

Cottonseed stearin is a by-product during the production of cottonseed salad oil and usually has a melting point of around 2000, so it is mainly used as a raw material for plastic fats and oils such as shortening and margarine, but it can be separated into low melting point components or liquid components. If we can collect this, we can further expand the uses of cottonseed stearin and increase its added value.

As methods for fractionating fats and oils, wet fractionation using a solvent or surfactant aqueous solution and dry fractionation using no solvent or surfactant are known. Although these methods have advantages and disadvantages, the dry method is generally the most advantageous in terms of cost, operation, etc. Moreover, among these methods, the method of slowly cooling fats and oils has the disadvantage of requiring careful temperature control and requiring 2 to 3 days to complete the furnace filtration. desirable.
This method has the advantage that the entire fractionation process can be carried out in a fairly short time (this method is called direct fractionation). However, in direct fractionation, if the proportion of high melting point components obtained by fractionation exceeds 20 to 30% (by weight; the same applies hereinafter), the viscosity of the crystallized mass of fats and oils will increase, and the furnace will become clogged during filtration. becomes so severe that it becomes extremely difficult to separate them. In the present invention, the direct method fractionation of cottonseed stearin was studied under various conditions, but effective fractionation could not be achieved. That is, the molten Watami stearin is stirred and cooled at various cooling rates to partially crystallize it.
However, if the furnace filtration is easy, the resulting high melting point part will be paste-like and the separation of the interstitial liquid will be completely insufficient. It became impossible to separate the stearin, and the melting point of the low melting point portion obtained was not much different from that of the original cottonseed stearin, and no effect of fractionation was observed. The purpose of the present invention is to provide a method that can easily carry out the direct fractionation of cottonseed stearin, which is difficult as described above. The goal is to increase added value.

As a result of various studies, the present inventor found that the above object can be achieved by utilizing the transesterification process in a specific manner.

The present invention was completed based on this knowledge. Cottonseed stearin is transesterified, 30% or more of it is blended with less than 70% of the original cottonseed stearin, and the mixture is cooled while stirring to partially crystallize it. This is a method for fractionating cottonseed stearin, which is characterized by separating the solid and liquid in a furnace.

Both indiscriminate and directional methods can be used for the ester exchange process.

Fractional susceptibility is best when the blending ratio of ester-exchanged cottonseed stearin and original Watami stearin is within the above range, and when the amount of cottonseed stearin exceeds 70%, susceptibility deteriorates rapidly. do.

By blending it with the original cottonseed stearin in this way, the amount of separation can be increased. That is, according to the method of the present invention, in order to separate cottonseed stearin, it is not necessary to subject the entire amount to transesterification treatment, which is advantageous in terms of cost and operation. In the classification after blending, the cooling rate is 10 to 40
It is desirable that it be about qC'hr.

The holding time at the final crystallization temperature is usually 30 to 60 minutes. When cottonseed stearin is transesterified, its melting point increases by more than 1000 points. However, when a specific amount of cottonseed stearin with an increased melting point is blended with the original cottonseed stearin for fractionation, a unique effect occurs in that the fractionation filtration property is improved. This phenomenon is presumed to be due to changes in the glyceride structure due to ester exchange, but the detailed mechanism is not clear. The present invention is carried out as described above, and according to this, cottonseed stearin, which has conventionally been difficult to separate, can be easily treated in a separation furnace to color the low melting point components and liquid components with good yield. Because you can take
Expanding the uses and increasing the added value of cottonseed stearin has been achieved, which is extremely significant industrially.

Experimental examples and examples are shown below. Experimental Example After completely melting cottonseed stearin (melting point 220), it was immersed in a 150' beaker in a 30q0 water bath for 90 minutes.

Water bath for 10-40qC'h while stirring at 20pm.
It was cooled at a predetermined rate of r to cause partial crystallization.

When the oil temperature reached 15°C or 1,000°C, the crystallized mass produced was quickly transferred to a glass furnace with an inner diameter of 6c and kept at the same temperature, and subjected to furnace heating by suction with an aspirator. Under most experimental conditions, the furnace filtration is slow and only a small amount of low melting point parts can be separated even after 60 minutes, and during that time the crystallized mass solidifies, making it pointless to continue the furnace filtration any longer. Met. The melting point was measured for the low melting point part that could be separated in a small amount by furnace. These classification results are shown in Table 1. Table 1 As a result, cottonseed stearin cannot be subjected to fractional filtration when the cooling rate is 10 to 300C/hr in the direct method, but fractional filtration is performed when the cooling rate is 400C/hr and the final oil temperature is 15℃. However, the melting point of the low melting point portion obtained was not much different from that of the original cottonseed stearin.

Therefore, it was determined that direct fractionation of cottonseed stearin was impossible because its permeability through the fractionation furnace was extremely poor under any conditions.

Example 1 Indiscriminate transesterification reaction of the cottonseed stearin used in the experimental example using 0.2% sodium methylate catalyst by a conventional method Seed stearin (A: melting point 31°C) was used to replace the original cotton. It was blended with real stearin music at a ratio of 90:10 to 10:90.

After completely melting these, place them in a beaker of 150 °C for 90 minutes, immerse them in a water bath of 55 qC, cool at a rate of 30 qC'hr from 560 °C to 1000 °C while stirring at 20 pm, and partially crystallize them, and further at 1000 °C for 30 minutes. crystallization continued. Thereafter, the mixture was transferred to a glass furnace with an inner diameter of 6 arcs kept at the same temperature, and the furnace was filtered by suction with an aspirator, and the furnace overspeed was measured. The results are shown in Table 1-2.
Table 2 As a result, it was found that when 30% or more of cottonseed stearin powder subjected to indiscriminate transesterification reaction was blended, the filtration property in direct separation was significantly improved.

Example 2 The green stearin used in the experimental example was subjected to an indiscriminate distillation reaction using a 0.5% sodium methylate catalyst in a conventional manner, and then the reactant was cooled to 20 to 0. A directional transesterification reaction was carried out for 6 hours (A: melting point 4
900) This product was blended with the original cottonseed stearin {B} and subjected to partial crystallization and filtration in the same manner as in Example 2.

The conditions and results are shown in Table 3. Table 3 Results: By blending 30% or more of A into pure stearin, it became possible to separate 10 to 15 qo.

Claims (1)

[Claims] 1. Cottonseed stearin is transesterified, 30% by weight or more thereof is blended with less than 70% by weight of the original cottonseed stearin, and this is cooled while stirring to partially crystallize it to form a solid-liquid. A method for fractionating cottonseed stearin, which is characterized by separation by filtration. 2. The fractionation method according to claim 1, wherein the cooling rate is 10 to 40°C/hr.