JP7158764B2 - Method for producing calcium hydroxide powder for washing fruits and vegetables and method for washing fruits and vegetables using the calcium hydroxide powder - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing calcium hydroxide powder for washing fruits and vegetables, and a method for washing fruits and vegetables using the calcium hydroxide powder.

Conventionally, an aqueous calcium hydroxide solution has been used to sterilize and wash fruits and vegetables such as cut vegetables and fruits (see, for example, Patent Document 1). Compared to chlorine-based disinfectants such as sodium hypochlorite aqueous solutions, calcium hydroxide aqueous solutions are less likely to cause deterioration of the original texture, taste, flavor, etc. of vegetables, and also have an unpleasant odor peculiar to chlorine-based disinfectants. There is no

JP 2011-67161 A

Here, the calcium hydroxide powder, which is the raw material for the calcium hydroxide aqueous solution for washing fruits and vegetables, must meet the standards for food additives. There was a problem that it was difficult to stably supply calcium powder.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for producing high-quality calcium hydroxide powder for washing fruits and vegetables, and a method for washing fruits and vegetables using the calcium hydroxide powder.

In order to solve the above problems,
The method for producing calcium hydroxide powder for washing fruits and vegetables of the present invention comprises:
a hard-burned quicklime generating step for generating hard-burned quicklime by firing calcium carbonate in an underground furnace;
a calcium hydroxide powder generating step for generating calcium hydroxide powder by subjecting the hard-burned quicklime generated in the hard-burned quicklime-generating step to water treatment;
and a calcium hydroxide powder dust collection step for collecting the calcium hydroxide powder generated in the calcium hydroxide powder generation step.

According to the present invention, fine, high-quality calcium hydroxide powder can be produced.

In the above invention,
In the hard-burned quicklime generating step, the burning period is three days.

According to the present invention, densification proceeds and an intermediate substance called hard-burned quicklime can be produced.

In the above invention,
In the calcium hydroxide powder dust collection step,
Among the calcium hydroxide powder produced in the calcium hydroxide powder producing step, the calcium hydroxide powder sprayed and scattered is collected.

According to the present invention, high-quality calcium hydroxide powder having an average particle size of 10 μm can be produced by collecting the sprayed and scattered fine, light powder.

The fruit and vegetable washing method of the present invention comprises:
adding the calcium hydroxide powder produced by the calcium hydroxide powder production method to water to produce a calcium hydroxide saturated aqueous solution;
and a step of treating fruits and vegetables with the calcium hydroxide saturated aqueous solution for 3 seconds to 3 minutes.

According to this feature, fruits and vegetables can be efficiently washed in a short time of 3 seconds to 3 minutes using a high-quality saturated aqueous solution of calcium hydroxide.

FIG. 2 is a process diagram of producing a calcium hydroxide powder for washing fruits and vegetables and washing fruits and vegetables according to an embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a production process diagram of a calcium hydroxide powder for washing fruits and vegetables and washing fruits and vegetables according to an embodiment of the present invention. First, with reference to FIG. 1, the manufacturing process of calcium hydroxide powder for washing fruits and vegetables will be described.

First, calcium carbonate, which is a raw material, is fired in an underground furnace for several days to produce hard-burned quicklime (step S1). Here, limestone with high purity is used as calcium carbonate as a raw material. Moreover, the period for baking calcium carbonate in an earthen furnace is preferably a long period of about three days. By firing calcium carbonate in an underground furnace for a long period of time in this way, compared to firing in a mechanical firing furnace for several hours, the decomposition reaction progresses to the inside, and the crystals grow and coalesce, increasing the volume. decreases and the bulk density increases.

Next, the hard burnt quicklime produced in step S1 is subjected to water treatment (step S2). This causes a high thermal explosion and produces fine calcium hydroxide powder.

Next, of the calcium hydroxide powder produced in step S2, the sprayed and scattered calcium hydroxide powder is collected (step S3). As a result, fine, high-quality calcium hydroxide powder having an average particle size of about 10 μm can be collected.

Next, using the calcium hydroxide powder produced in step S3, fruits and vegetables are washed. Specifically, first, the calcium hydroxide powder produced in step S3 is added to water to produce a calcium hydroxide saturated aqueous solution (step S4). Here, the temperature of water is preferably 0 to 35°C. A calcium hydroxide saturated aqueous solution has a calcium hydroxide concentration of 0.17% by mass and a pH of 12.4 at a temperature of 25°C.

Fruits and vegetables to be sterilized are immersed in the calcium hydroxide saturated aqueous solution (step S5). Here, the treatment time, that is, the time for immersing fruits and vegetables in the saturated calcium hydroxide aqueous solution is short (3 seconds to 3 minutes) because the saturated calcium hydroxide aqueous solution is strongly alkaline and has high sterilization power. Therefore, it is possible to efficiently wash fruits and vegetables.

また、表２は、上記製造方法で製造された水酸化カルシウム粉末を用いて青果物を除菌した場合、食中毒防止に有効であることを示す資料である。
試験ウイルスは、主要な食中毒菌（黄色ブドウ球菌、大腸菌、腸管大腸菌Ｏ１５７、サルモネラ、ノロウイルス代替ネコカリシウイルス）であり、試験結果のＡは各細菌やウイルスを直接的に作用させた試験であり、Ｂは有機物で汚染された環境を想定しアルブミン５％を加えての試験である。試験結果の各表の下欄に示すように、全ての試験ウイルスを１００．００％まで完全に不活性化することができ、高い除菌力が示されている。

Table 1 shows comparison data of the sterilization power between the calcium hydroxide powder produced by the above production method and common agricultural slaked lime. In Table 1, the unit of numerical values in the upper part of the table of the test results is Log10 ^X power, and the numerical values in the lower part of the table are expressed as percentages by converting the numerical values in the upper part of the table into real numbers. When using the calcium hydroxide powder produced by the above production method, viruses can be almost completely inactivated to 99.99%, compared to slaked lime, which cannot completely inactivate viruses. It has been shown to have high sterilizing power.

Further, Table 2 is data showing that the calcium hydroxide powder produced by the above production method is effective in preventing food poisoning when fruits and vegetables are sterilized.
The test viruses are major food-poisoning bacteria (Staphylococcus aureus, Escherichia coli, enteric Escherichia coli O157, salmonella, norovirus-alternative feline calicivirus), and test result A is a test in which each bacterium or virus acts directly. B is a test in which 5% albumin is added assuming an environment polluted with organic matter. As shown in the lower column of each test result table, all test viruses could be completely inactivated up to 100.00%, indicating high sterilizing power.

As described above, by the above-described production method, a fine, high-quality calcium hydroxide powder for washing fruits and vegetables can be produced, and the calcium hydroxide powder can be used to wash fruits and vegetables safely and in a short time. It can be carried out.

Claims (3)

A method for producing calcium hydroxide powder for washing fruits and vegetables, comprising:
a hard-burned quicklime generating step for generating hard-burned quicklime by firing calcium carbonate in an underground furnace;
a calcium hydroxide powder generating step for generating calcium hydroxide powder by subjecting the hard-burned quicklime generated in the hard-burned quicklime-generating step to water treatment;
and a calcium hydroxide powder dust collection step for collecting sprayed and scattered calcium hydroxide powder among the calcium hydroxide powder generated in the calcium hydroxide powder generation step. Calcium oxide powder manufacturing method. 2. The method for producing calcium hydroxide powder for washing fruits and vegetables according to claim 1, wherein in said hard-burned quicklime generating step, said burning period is 3 days. A step of adding calcium hydroxide powder produced by the method for producing calcium hydroxide powder according to claim 1 or 2 to water to produce a calcium hydroxide saturated aqueous solution;
a step of treating fruits and vegetables with the saturated aqueous solution of calcium hydroxide for 3 seconds to 3 minutes;
A method for washing fruits and vegetables, comprising:

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