JP2001107076A - Method for dry-fractionating fat and oil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for dry-fractionating a fat and oil more simply at good efficiency. SOLUTION: This method comprises either adding an adsorbent to a fat and oil molten by heating or melting a fat and oil containing an added adsorbent by heating, and cooling the fat and oil in the presence of the adsorbent to obtain a liquid fraction and a crystalline fraction. It is desirable that the adsorbent is at least one member selected from active clay, active carbon, silica gel, and an ion exchange resin. Desirably, the adsorbent is used in an amount of 0.005-0.5 pt.wt. per 100 pts.wt. fat and oil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dry separation of fats and oils.

[0002]

2. Description of the Related Art It is known to cool a dissolved fat or oil, partially crystallize at a low temperature, and then separate a crystal part and a liquid part by filtration. As a method of crystallizing and separating such fats and oils, there are a solvent fractionating method in which the fats and oils are dissolved in an organic solvent such as acetone and hexane for crystallization and filtration, and a dry fractionating method which does not use an organic solvent.

[0003] The dry fractionation method is preferable to the solvent fractionation method in terms of cost and safety. However, the separation accuracy of the crystal part and the liquid part is lower than that of the solvent fractionation method, and particularly when a large amount of crystals are generated. However, there are problems such as that the viscosity of the slurry increases, the separation accuracy by filtration is remarkably reduced, or fluidity is lost and filtration cannot be performed.

In order to solve such a problem, Japanese Patent Laid-Open No.
Japanese Patent Publication No. -154897 discloses a method in which a physically refined palm oil or a fractionated palm oil is brought into contact with an adsorbent such as activated carbon or activated clay to carry out an adsorption treatment, followed by dry fractionation, and the adsorbent treatment and dry fractionation. Are described in a continuous manner. This method requires equipment for performing adsorbent treatment in addition to the dry separation apparatus, and has the disadvantage that fats and oils adhering to the adsorbent due to the adsorbent treatment are lost.

Japanese Patent Application Laid-Open No. 10-511420 discloses that an esterified product of inulin or flane having a molecular weight of 500 to 3990 is added to a dissolved fat or oil as a crystallization modifier, dissolved, and crystallized, whereby the separation efficiency is improved. Is described as being improved. However, it was difficult and not practical to remove such a crystallization modifier from the obtained crystal part.

Accordingly, an object of the present invention is to provide a method for dry separation of fats and oils, which can efficiently separate fats and oils by a simpler method.

[0007]

The above object of the present invention is attained by the following method for dry separation of fats and oils.

That is, according to the present invention, an adsorbent is added to a heat-dissolved oil or fat, or the oil or fat to which the adsorbent is added is heated and dissolved, and then the oil or fat is cooled in the presence of the adsorbent to form a liquid part and a crystal part. It is a method for dry separation of fats and oils, characterized in that it is obtained.

[0009]

Embodiments of the present invention will be described below. The dry fractionation method of fats and oils of the present invention, as described above, add an adsorbent to the heat-dissolved fat or oil, or after heating and dissolving the fat with the adsorbent, cool the fat and oil in the presence of the adsorbent, A liquid part and a crystal part are obtained.

As the fats and oils used in the dry fractionation method of the present invention, palm oil or palm olein is particularly suitable, but other than palm kernel oil, shea butter, monkey fat, mango kernel oil, molar fat, cocoa butter, etc. , Cottonseed oil, milk fat, lard, beef tallow, hardened soybean oil, hardened rapeseed oil, hardened fish oil, and the like, and their transesterified oils can be used.

As the adsorbent used in the present invention, one or more selected from activated clay, activated carbon, silica gel, and ion exchange resin are preferably used. Activated clay, activated carbon and silica gel are particularly desirable.

In the dry fractionation method of the present invention, first, an adsorbent is added to the heat-dissolved oil or fat, or the oil or fat to which the adsorbent is added is heat-dissolved. The temperature for heating and dissolving may be set under such conditions that the fats and oils are dissolved, and preferably 50 to 90.
° C, more preferably 60 to 80 ° C, and heat treatment is performed at this temperature for about 10 to 60 minutes.

The amount of the adsorbent to be added is preferably 0.005 to 0.5 part by weight, more preferably 0.01 to 0.3 part by weight, per 100 parts by weight of fats and oils. If the amount of the adsorbent is less than 0.005 parts by weight, the viscosity of the slurry increases during crystallization, and the separation accuracy tends to decrease by filtration. Similarly, when the amount is more than 0.5 part by weight, the viscosity of the slurry during crystallization increases, and the separation accuracy in filtration tends to decrease.

In the present invention, the adsorbent is added to the heat-dissolved fat or oil, or the fat or oil to which the adsorbent is added is heated and dissolved, and then the fat or oil is cooled in the presence of the adsorbent. The cooling conditions vary depending on the type of fat or oil to be subjected to dry separation and the purpose. For example, in the case of separating palm olein, the palm olein is heated and dissolved at 50 to 80 ° C. for about 30 to 60 minutes, and adsorbed thereon. Add the agent and slowly stir.
Cool to 5 to 20 ° C over about 6 to 18 hours, or add an adsorbent to palm olein,
Heat and dissolve for about 60 minutes and slowly agitate for 15-2.
Cool to 0 ° C over about 6-18 hours. Then, conditions for holding at a predetermined temperature for about 10 to 60 hours can be exemplified. At this time, palm olein or palm oil crystallized in advance, or palm stearin, extremely hardened soybean oil, or the like can be added as a seed. When the temperature of palm olein is 15 to 30 ° C., about 0.01 to 4% by weight of the seed is added to palm olein. Then, the mixture is filtered by a filter press, a reduced pressure filter, or the like, and further squeezed as necessary to obtain a liquid part and a crystal part.

When palm oil is separated, it is heated and dissolved in the same manner as in the case of palm olein, and then an adsorbent is added, or the palm oil to which the adsorbent is added is heated and dissolved, followed by stirring. While cooling to 20 to 30 ° C. over about 3 to 10 hours, and holding at a predetermined temperature for about 5 to 20 hours, it can be exemplified. In this case, generally no seed is added.

According to the dry fractionation method of the present invention, aggregation of precipitated crystals is promoted, and larger crystals can be formed. As a result, the slurry during crystallization was 500 mP
Since a low viscosity of not more than a · s is maintained, a high filtration rate can be obtained at a relatively low pressure of about 0.2 MPa, and squeezing can be performed at a pressure as low as about 0.5 MPa.

[0017]

The present invention will be specifically described below based on examples and comparative examples.

Example 1 1 g of activated clay was added to 1000 g of RBD palm olein heated and dissolved at 70 ° C. for 60 minutes, followed by sufficient stirring. Subsequently, the mixture was cooled to 20 ° C. over 5 hours at 10 ° C./hour with slow stirring, and 1 g of previously crystallized palm oil was added as a seed when RED palm olein reached 20 ° C. After the addition of the seed, the mixture was further cooled to 17 ° C. at 1 ° C./hour, kept at 17 ° C. for 30 hours to crystallize, and filtered and pressed by a filter press to obtain a liquid part and a crystal part. FIG. 1 shows the change in viscosity of the slurry during crystallization, and Table 1 shows the yield and iodine value of the obtained liquid part and crystal part.

Comparative Example 1 RBD Palm Olein 100
After adding 1 g of activated clay to 0 g, the mixture was stirred at 80 ° C. and 100 torr for 30 minutes, and then filtered to remove the activated clay. The obtained bleached oil was crystallized in the same manner as in Example 1, and filtered with a filter press to obtain a liquid part and a crystal part. FIG. 1 shows the change in viscosity of the slurry during crystallization, and Table 1 shows the yield and iodine value of the obtained liquid part and crystal part.

Example 2 RBD Palm Olein 100
0.5 g of activated clay was added to 0 g, and the mixture was stirred at 70 ° C. for 60 minutes. Thereafter, crystallization was performed under the same conditions as in Example 1, and filtration and pressing were performed to obtain a liquid part and a crystal part. FIG. 2 shows the change in viscosity of the slurry during crystallization, and Table 1 shows the yield and iodine value of the obtained liquid part and crystal part.

Comparative Example 2 RBD Palm Olein 100
0.5 g of activated clay was added to 0 g, and the mixture was dried under reduced pressure at 70 ° C. for 6 hours.
After stirring for 0 minutes, the mixture was filtered to remove activated clay. afterwards,
Crystallized under the same conditions as in Example 1, filtered and pressed,
A liquid part and a crystal part were obtained. FIG. 2 shows the change in viscosity of the slurry during crystallization, and Table 1 shows the yield and iodine value of the obtained liquid part and crystal part.

[0022]

[Table 1]

As is clear from the results shown in FIGS. 1 and 2 and Table 1, Examples 1 and 2 in which the fats and oils are cooled in the presence of activated clay.
Compared with Comparative Examples 1 and 2 in which the fats and oils are bleached with activated clay and the activated fats are removed and then the fats and oils are cooled, the viscosity of the slurry during crystallization is maintained at a lower level, and the slurry is more pure (iodine). It can be seen that a (lower value) crystal part is obtained.

[0024]

As described above, the adsorbent is added to the heat-dissolved oil or fat, or the oil or fat to which the adsorbent is added is heated and dissolved, and then the oil or fat is cooled in the presence of the adsorbent, and the liquid part and the crystal are removed. The dry fractionation method for fats and oils of the present invention for obtaining a part can maintain a low viscosity state of the slurry during crystallization by a simple method, so that the fats and oils can be fractionated efficiently. Further, a crystal part having high purity can be obtained.

[Brief description of the drawings]

FIG. 1 is a graph showing a change in viscosity of a slurry at the time of crystallization of Example 1 and Comparative Example 1.

FIG. 2 is a graph showing a change in viscosity of a slurry during crystallization of Example 2 and Comparative Example 2.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satsuki Hashimoto 7-35, Higashiogu, Arakawa-ku, Tokyo Asahi Denka Kako Kogyo Co., Ltd. (72) Sachiko Yamamoto 7-35, Higashiogu, Arakawa-ku, Tokyo Asahi Denka Kogyo K.K.

Claims (3)

[Claims] 1. An adsorbent is added to a heat-dissolved oil or fat, or the oil or fat to which the adsorbent is added is heated and dissolved, and then the oil or fat is cooled in the presence of the adsorbent to obtain a liquid part and a crystal part. Separation method for fats and oils. 2. The method according to claim 1, wherein the adsorbent is at least one selected from activated clay, activated carbon, silica gel, and ion exchange resin. 3. The method according to claim 1, wherein 0.005 to 0.5 part by weight of the adsorbent is added to 100 parts by weight of the fat or oil.
A method for dry separation of fats and oils as described in the above.