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Deoxidant and process for producing deoxidant

A manufacturing method and technology of deoxidizer, which are applied in the field of deoxidizer, can solve the problems of cerium oxide being easy to catch fire, insufficient oxygen absorption capacity, and insufficient performance of deoxidizer, so as to prevent fire caused by violent reaction with oxygen, and have good oxygen absorption effect. Effect

Inactive Publication Date: 2008-12-24
MITSUI MINING & SMELTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) Since a small amount of moisture must exist when reacting with oxygen, the performance of conventional deoxidizers cannot be fully exerted when storing items that are afraid of moisture such as dry food, electronic components, and solder powder.
[0008] (2) When checking whether impurities such as metals are mixed in the food packaged with the conventional deoxidizer and inert gas in the packaging body, the iron powder of the iron-based deoxidizer reacts with the metal detector, so that it cannot be easily carried out. check
[0016] However, a deoxidizer using only titanium oxide as an inorganic oxide has a problem of insufficient oxygen absorption capacity compared to an iron-based deoxidizer.
[0017] In addition, for a deoxidizer using cerium oxide as an inorganic oxide, due to the easy ignitability of cerium oxide, when filling the deoxidizer in the product, it needs to be carried out under a low-oxygen atmosphere or an inert gas atmosphere, or it must be quickly Filling processing is performed, so there is a problem in operation

Method used

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  • Deoxidant and process for producing deoxidant
  • Deoxidant and process for producing deoxidant
  • Deoxidant and process for producing deoxidant

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no. 1 Embodiment approach

[0060] Next, the deoxidizer according to the first embodiment of the present invention will be described.

[0061] The deoxidizer of the first embodiment of the present invention is made of cerium oxide (CeO x , wherein, x is a positive number less than 2) formed, and the specific surface area is 0.6m 2 The powder below / g or the specific surface area is 3.0m 2 / g or less molded body.

[0062] Such a deoxidizer according to the present embodiment reacts with oxygen in the atmosphere as shown in the following chemical formula (2).

[0063] CeO x +((2-x) / 2)O 2 →CeO 2 (2)

[0064] That is, the above-mentioned high-temperature reduction-treated cerium oxide (CeO x , wherein, x is a positive number less than 2) oxygen is removed from the crystal lattice by reduction treatment to form an oxygen vacancy state. Because it reacts with oxygen in the atmosphere as shown in the above-mentioned chemical formula (2), it can exert an effect as a deoxidizing agent.

[0065] Here, as ...

no. 2 Embodiment approach

[0078] Next, a deoxidizer according to a second embodiment of the present invention will be described.

[0079] The deoxidizer according to the second embodiment of the present invention is a deoxidizer that absorbs and removes oxygen in the atmosphere, and the deoxidizer is an inorganic oxide having oxygen vacancies, and an additive element that increases the oxygen absorption amount of the inorganic oxide is added.

[0080] Here, in the present invention, the inorganic oxide may be any one of cerium oxide, titanium oxide, zinc oxide, etc., or a mixture thereof.

[0081] It is particularly preferable to use cerium oxide, which has a large oxygen absorbing capacity when used alone, as the inorganic oxide. As an additional element to be added to the inorganic oxide, it is preferable to add an element near the ionic radius of the inorganic oxide, but there is no limitation as long as the oxygen absorption amount can be increased by adding a substance.

[0082] Here, in this emb...

no. 3 Embodiment approach

[0103] In addition, if Figure 8 As shown, the deoxidizers of the above-mentioned first embodiment and second embodiment can also be deoxidized by the cerium oxide having a predetermined specific surface area or an inorganic oxide added with an element that increases the oxygen absorption amount. Layer 11, a gas barrier layer 12 provided on the outer layer side of the deoxygenation absorbing layer 11 and having gas barrier properties, a gas permeable layer provided on the inner layer side of the deoxygenation absorbing layer 11 and having gas permeability 13 constitutes the deoxidation function film 10. here, Figure 8 In , symbol 15 represents oxygen.

[0104] in addition, Figure 8 Among them, the outer side of the gas barrier layer 12 is provided with an outer layer 14 to protect the gas barrier layer.

[0105] Here, examples of the gas barrier layer 12 include aluminum foil, polyethylene terephthalate (PET), polyethylene (PE), stretched polypropylene (PP), polyvinyl al...

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Abstract

A deoxidizer for absorbing and removing oxygen from the surrounding atmosphere, comprising oxygen-deficient cerium oxide having a powder form with a specific surface area of 0.6m <2> / g or less or the form of a formed body with a specific surface area of 3.0m <2> / g or less. The deoxidizer reacts with oxygen even in a moisture-free atmosphere, does not trigger a metal detector nor heat up when microwaved in a microwave oven, and is prevented from abruptly reacting with oxygen and igniting even when brought into direct exposure to the air. The deoxidizer is therefore suited for oxygen removal, for example, inside food packages.

Description

technical field [0001] The present invention relates to a deoxidizer that absorbs and removes oxygen in an atmosphere (also referred to as a gas medium, an ambient atmosphere, or a surrounding atmosphere) and a method for producing the deoxidizer. Background technique [0002] In recent years, in response to strong demands for food safety and quality maintenance, the inside of a food package for packaging food is made anaerobic to suppress oxidative deterioration of the food. [0003] Specifically, a deoxidizer that absorbs and removes oxygen in the atmosphere is packed into the inside of the food packaging body together with the food, and the residual oxygen inside the food packaging body is removed, thereby making the inside of the food packaging body an oxygen-free state. . In addition, in an oxygen-free inert gas (also referred to as an inert gas), the food is packaged together with the above-mentioned deoxidizer in a package for food so that oxygen does not enter the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06A23L3/3436B01D53/14
Inventor 木下和也八岛勇
Owner MITSUI MINING & SMELTING CO LTD
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