JPS5843067B2 - How to prevent okara from rotting - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for preventing spoilage of okara.

Okara, which is produced as the squeezed residue of soymilk when making tofu, has traditionally been used primarily as feed for livestock such as cows and pigs, but as household reserves in the area have decreased, it has become difficult to use it as feed. The current situation is that

In other words, okara is extremely perishable and usually gives off a bad odor even if it is left for one day, so it is best to use it as feed before it rots as the farm gradually moves farther away from the area. Nowadays, transportation is becoming increasingly difficult.

Also, as the scale of tofu manufacturers gradually increases,
Currently, bean curd curd curd tends to clump together and form in large quantities, which makes the above-mentioned processing of bean curd even more difficult.

However, as mentioned above, okara is extremely perishable, so it is unacceptable to leave it unattended from a public health perspective, and tofu manufacturers in the sub-area are troubled by how to deal with it. Currently, okara is generally incinerated.

However, although it varies depending on the tofu manufacturing conditions, okara usually contains about 85 to 70% water, making it difficult to burn, and therefore incinerating it requires a lot of cost.

In this way, although okara is originally useful as household feed, it is extremely perishable and not only cannot be used effectively, but also requires a great deal of effort and expense to process. Therefore, in order to effectively utilize this okara as feed, there is a desire in the industry to develop a method to easily prevent okara from rotting.

In view of the current situation, the present inventors have conducted intensive research with the aim of providing a simple method for preventing rotting of okara. found incorruptibility,
This completes the present invention.

That is, the present invention is a method for preventing spoilage of okara, which is characterized by mixing lightly burnt magnesium oxide and magnesium chloride with okara.

It is truly surprising that okara, which is highly perishable, can be treated with a simple mixture of lightly burnt magnesium oxide and magnesium chloride without spoiling or emitting any foul odor for several months or more.

The present invention is economically advantageous because it can be carried out in an extremely simple manner using inexpensive additives, and the obtained processed product is stable for a long period of time, so it has the advantage that it can be effectively used for feed, etc. .

In the present invention, it is necessary to mix lightly burnt magnesium oxide and magnesium chloride with okara.

In the present invention, as light burnt magnesium oxide, for example, magnesium carbonate, magnesium hydroxide, etc.
Those obtained by power-calcining at 0°C or lower, usually 800 to 900°C, can be used, but those obtained by similarly power-calcining using seawater as a raw material and those obtained from natural sources are also suitable in the present invention. Can be used.

In the present invention, as magnesium chloride, a hexahydrate salt is usually used, but an anhydrous salt can also be used.

In the present invention, lightly burnt magnesium oxide and magnesium chloride are used in okara 1 when okara has a water content of 70%.
20 to 100 parts by weight, especially 50 to 100 parts by weight
It is preferable to mix in a range of 100 parts by weight.

If the amount of the mixture is less than 20 parts by weight, the anti-corrosion effect will be low and the mixture will tend to be difficult to solidify.

On the other hand, even if more than 100 parts by weight is mixed, the anti-corrosion effect will hardly improve any further, and on the contrary, it will become difficult to use the treated product for feed, etc., so although it is economically advantageous, do not have.

The above mixing amount is based on the case where the water content of the okara is 70 kan, but since the preferred mixing amount of light roasted magnesium oxide and magnesium chloride is determined based on the solid content of the okara, the water content of the okara used is If different, the mixing amount may be adjusted as appropriate based on the above criteria.

A preferred ratio of light burnt magnesium oxide and magnesium chloride is in the range of 4 to 12 moles of light burnt magnesium oxide per 1 mole of magnesium chloride (hexahydrate).

When using an anhydrous salt as magnesium chloride, the mixing amount may be adjusted as appropriate according to the above criteria.

To mix lightly roasted magnesium oxide and magnesium chloride with bean curd, for example, take the okara in a container, add lightly roasted magnesium oxide and magnesium chloride to it, and stir.

The order in which the three components are mixed is not particularly limited and various methods may be used, but in the present invention, it is desirable that the three components be mixed as uniformly as possible.

In the present invention, a method is preferably used in which lightly burnt magnesium oxide and magnesium chloride are mixed in advance, and kara is added to this, or this mixture is added to the bean curd. However, when bittern is used as the magnesium chloride component, It is preferable to mix okara and bittern in advance and add lightly burnt magnesium oxide to this mixture.

Stirring at room temperature for 5 to 10 minutes is enough to achieve the object of the present invention, and various known stirring devices can be used.

If the mixture thus mixed is left at room temperature,
Cure in ~10 hours.

If the temperature is high, the curing speed increases; for example, at 50° C., it can be cured in 3 to 4 hours, but it is not preferable to raise the temperature too high.

The curing time can also be adjusted by additives.

For example, the curing time can be shortened by adding calcium hydroxide, and the curing time can be extended by adding phosphoric acid compounds, such as sodium tripolyphosphate.

The preferred amount to be added is 1 to 3 weight percent in the case of calcium hydroxide, and 0.5 to 1 weight percent in the case of TripoIJ sodium chloride, based on the total amount of light burnt magnesium oxide and magnesium chloride.

After stirring and mixing, the mixture can be cured as it is to obtain powder or granular products, or it can be placed in containers of various shapes, compressed, and hardened to obtain molded products of various shapes.

The cured product can be crushed, cut, or cut as necessary.

According to the present invention, it is possible to prevent okara from rotting with an extremely simple operation, so it is of great value in terms of pollution prevention.

In addition, the okara mixed with lightly burnt magnesium oxide and magnesium chloride according to the present invention does not spoil for several months or more, so it can be suitably used as feed or fertilizer, for example.

Further, according to the present invention, the mixture can be obtained as a molded product of any shape, and can also be crushed, cut, etc., which is advantageous in terms of transportation and processing.

The present invention will be explained in more detail below by giving examples.

In addition, "parts" and "%" in the examples mean "parts by weight" and "weight φ".

Example 1 100 parts of okara with a moisture content of 70% was placed in a mixing tank with stirring blades, and lightly burnt magnesium oxide (magnesium hydroxide obtained by reacting seawater with lime was baked at 900°C)64 1 part and 36 parts of magnesium chloride hexahydrate powder were added thereto, and the mixture was stirred at room temperature for 10 minutes to obtain a mixture.

The resulting mixture was packed in a mold and left to stand at room temperature for 10 hours, whereupon it was cured and a molded product was obtained.

The obtained molded product did not generate any bad odor and did not decompose even after 6 months.

This molded product was pulverizable and suitable as a mixed feed.

Example 2 900% magnesite ore as light burnt magnesium oxide
A molded product was obtained in the same manner as in Example 1, except that the molded product was fired at ℃.

The obtained molded product did not rot as in Example 1, and the pulverized product was suitable as a mixed feed.

Example 3 61 parts of lightly burnt magnesium oxide used in Example 1, 36 parts of magnesium chloride hexahydrate, and 3 parts of calcium hydroxide were uniformly mixed to obtain a powder.

Fifty parts of this powder was mixed with 100 parts of the okara used in Example 1 in the same manner as in Example 1, and when the mixture was left in a mold frame, it hardened after 5 hours to obtain a molded product.

The obtained molded product did not rot like in Example 1, and the pulverized product was suitable as a compound fertilizer.

Claims (1)

[Claims] 1. A method for preventing spoilage of okara, which is characterized by mixing lightly burnt magnesium oxide and magnesium chloride with okara.