JPS58218926A - Washing of grains - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for washing grains when subjecting them to Q-processing such as steaming, cooking, or milling, and generally by washing grains using liquefied carbon dioxide gas. This eliminates the inconvenience caused by washing with water.

It is well known that when grains, such as rice, are cooked and processed, it is necessary to remove bran and starch that are mixed in the grain or attached to the surface of the grain, but this is usually done by washing with water. However, the method of washing with water has disadvantages in that when it is industrially treated, water is required for the equipment and waste water causes pollution. In other words, the waste water after washing is B.
Since the UD is very high and contains oil, this is purified by τ
It costs a lot of money to do so. In addition, there is a drawback in that bran, finely powdered starch, and taste substances such as sugars and amino acids flow out during washing, making it difficult to recover them.

In addition, there is a method of increasing the degree of milling by polishing instead of washing with water, but grains treated with this method
The grain has a poor flavor and a strong bran odor, and processing without water washing is not necessary, and the yield of edible grains is poor, and the grains may be destroyed, which is undesirable. Next, there is a method of extracting the oil and simultaneously polishing it using an organic solvent such as n-hexane, but this method is extremely difficult to remove the solvent from the raw materials. However, there are disadvantages such as complete solvent removal or internal locking, which is also undesirable from a food hygiene perspective.

The above is mainly about the inconveniences and drawbacks of industrial grain processing, but the point that pollution caused by wastewater is also caused in the case of civil H4 is the same.

Washing rice using water requires a considerable amount of water and is time-consuming, so if it is possible to supply grains that do not require washing with water, especially rice, it is effective. However, the conventional method of washing with water has the disadvantage of preservation, and the present invention was devised as a result of various studies based on the above. By washing the grains with gas, the bran and starch mixed in the grain or attached to the surface of the grain are separated and removed in the liquefied carbon dioxide gas, and the bran mixed in the liquefied carbon dioxide gas is removed. This is done by separating and recovering starches. This eliminates the above-mentioned inconvenience caused by washing with water, and also provides advantages such as ease of storage and the ability to cook rice without the hassle.

Hereinafter, an example of the implementation of the grain cleaning method of the FX invention will be explained with reference to the drawings, where l is a grain storage tank, 2 is a pressure-resistant structure,
A cleaning tank 8 is provided with an agitator, and 8 is a storage tank in which washed grains are stored and supplied to processing steps (not shown) such as processing or packaging.

Next, 4&'i is a solid-liquid separator for separating the bran and starch removed from the grains and mixed in the liquefied carbon dioxide gas, and 6 is a storage tank for the liquefied carbon dioxide gas. In addition, these types 1, 2, 8.
6 and solid-liquid separator @4 are connected by pipes, the grain flow path is shown by a solid line, and the liquefied carbon dioxide flow path is shown by a dotted line.
I'm n.

The grains in the grain storage tank 1 are supplied to the washing tank 2 via a valve 6. When the amount of grain in the washing tank 2 reaches a predetermined amount, the valve 6 is closed, and the valve 7 is closed.
[Open to introduce liquefied carbon dioxide gas, and drive the agitator in the wash 418 to agitate the grains.

This operation removes bran and finely powdered starches.
1 is transferred into liquefied carbon dioxide gas, and at the same time, components with a brachy odor such as n-hexanal, n-pentanal, and thiazole are chemically extracted by the liquefied charcoal gas.

When the stirring and cleaning operation with liquefied carbon dioxide gas at 0 pressure F has been carried out for a sufficient period of time, valve 8 and valve it are opened to guide the liquefied carbon dioxide gas to sap separator i4. Then, close the valve 11, open the valve 9, and transfer the grains in the washing 4w2 to the storage tank 8.
For subsequent steps, such as processing or packaging, valve lO is opened to supply T. - The liquefied carbon dioxide gas that was not introduced into the solid-liquid separator 4 is separated from bran, starch, etc. in the device 4, and then circulated for use.

According to the method of the present invention, commercially available polished rice TO009 was washed in a pressure vessel equipped with a stirrer. At this time, by using liquefied carbon dioxide gas for several minutes, 992g of washed rice with a transparent white color and excellent appearance was obtained, and the bran and fine powder were dried using liquefied carbon dioxide gas. Recovered in condition.

This rice had a better yield than equivalent washed rice obtained by normal water washing. Next, the rice obtained is cooked in a conventional manner,
When subjected to a sensory test, there was no bran odor at all, and the flavor, appearance,
All the textures were good, and there was no inferiority at all compared to 7 pieces of rice (/J), which were cooked using the same rice washing process.

It should be noted that the method of the present invention is implemented in a relatively large scale industrial sector.
In this case, by providing a plurality of cleaning tanks and controlling the supply of liquefied carbon dioxide, which is the cleaning liquid, to the six tanks, the amount of liquefied cooking gas consumed per raw material for single pox can be reduced. Also, 1ml of grain storage and $1 for washed grain storage! Since it is easy to maintain a carbon dioxide atmosphere in the y8 and solid-liquid separator at all times, the quality of grains and recovered materials can be maintained. Moreover, if the grains in the washed grain storage tank 8 are sealed and filled in, for example, an impermeable bag while blocking the atmosphere, they can be stored for a long period of time without deterioration of quality.

As described above, the method of the present invention organically combines the physical operations of stirring and washing grains in the presence of liquefied carbon dioxide and the chemical operations of extracting the bran odor. The second feature is that the rice bran and starch that have migrated into the liquefied carbon dioxide gas are separated and recovered, and the liquefied carbon dioxide gas from which the rice bran and starch have been separated is recycled and used. Therefore, compared to conventional means, many effects such as F are expected.

First of all, there is no need for washing, so there is no need for wastewater treatment.
It is possible to save labor associated with cleaning. In addition, since the washed grain can be stored for a long period of time, it is easy to process T6 even when used for civilian purposes.
There is no need for additional washing, and the product can be recovered in a dry state after washing, making the next process or storage treatment easy. Next, the rice bran that conventionally flowed out due to water washing and was recovered was 2071 m.
Starches can be easily recovered in a dry state, making it possible to utilize them effectively. Furthermore, the outflow of water-soluble substances such as sugars, amino acids, and vitamin B172 is significantly reduced compared to washing with water, and items cleaned by the method of the present invention have a high water absorption rate when immersed in water. There is.

As is well known, liquefied carbon dioxide gas is safe from a food hygiene perspective, and in addition to its cleaning effect, it also kills pests and their eggs in grains.

In addition, liquefied carbon dioxide gas can be obtained at low cost, and because it is recycled and used, it requires less consumption, and together with the above-mentioned effects, it has great practical benefits.1. .

The figure is a flow diagram showing an example of an apparatus for carrying out the cleaning method of the invention.

l...grain storage tank, 2...washing f! I
Tank, 8... Storage tank, 4... Solid-liquid separator, b... Liquefied carbon dioxide storage tank, 6, 7, 8,
9.10,11... Valve.

Applicant: Nippon Sanso Co., Ltd.

Claims (1)

[Claims] 111 imi Presence of liquefied carbon dioxide A method for washing grains characterized by stirring in F to transfer bran, starch, etc. to liquefied carbon dioxide, and then separating the grains from liquefied carbon dioxide. . (2) Grain P is stirred in the presence of liquefied carbon dioxide gas to transfer bran, starch, etc. to liquefied carbon dioxide gas, and after separating the grains and liquefied carbon dioxide gas in step (2), the bran in the liquefied rice cooking gas, A method for washing grains characterized by separating and recovering starch, etc., and circulating and using liquefied carbon dioxide gas.