Iron-Based Deoxygenation Agent Composition for Low-Hydrogen Oxygen Absorption
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Solution Overview
Problem
Existing oxygen scavenger compositions with intermediate water activity suffer from inferior oxygen absorption performance and excessive hydrogen generation, leading to container deformation and rupture, especially when used with low-moisture preserved objects.
Innovation Solution
An oxygen scavenger composition comprising iron powder, activated carbon, a halide of an alkaline earth metal, and an alkaline substance, with specific ratios of activated carbon, water, and halide content, along with an optional swelling agent, to achieve intermediate water activity, enhanced oxygen absorption, and reduced hydrogen generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large amount of iron powder and water is used to increase oxygen absorption amount, then oxygen absorption performance is improved, but hydrogen generation amount increases causing container deformation and rupture
Solution Approach 1:
The patent changes the water activity parameter of the oxygen scavenger composition to an intermediate range (0.40-0.60) rather than using high water activity. This parameter change allows the composition to absorb large amounts of oxygen while suppressing hydrogen generation, as the intermediate water activity optimizes the balance between oxygen absorption rate and hydrogen evolution during the reaction
Solution Approach 2:
The patent uses a composite material system consisting of iron powder, activated carbon, water, a halide of an alkaline earth metal, and an alkaline substance. This composite formulation achieves both high oxygen absorption performance and low hydrogen generation by leveraging the synergistic effects of each component: iron powder provides the oxygen absorption function, activated carbon controls water activity and suppresses hydrogen generation, the halide and alkaline substance regulate reaction kinetics and water activity
2Productivity
If moisture is transferred from oxygen scavenger composition to preserved object to supplement moisture for oxygen absorption reaction, then oxygen absorption reaction can proceed, but moisture content of preserved object changes and oxygen absorption performance is deteriorated
Solution Approach 1:
The patent adjusts the water activity parameter of the oxygen scavenger composition to match the water activity of the preserved object (intermediate water activity range). This parameter matching prevents moisture transfer from the scavenger to the preserved object, ensuring both sufficient moisture for oxygen absorption reaction and quality stability of the preserved object
Solution Approach 2:
The patent uses activated carbon as an intermediary substance that controls water activity and mediates the moisture balance between the oxygen scavenger composition and the preserved object. The activated carbon absorbs and releases moisture selectively, preventing excessive moisture transfer while ensuring enough moisture is available for the iron powder oxygen absorption reaction
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition exhibits excellent oxygen absorption performance while minimizing hydrogen generation, suitable for preserving objects with intermediate water activity, preventing moisture transfer and container deformation.
Implementation Method 1
an oxygen scavenger (hereinafter, an iron-based oxygen scavenger) using an oxidation reaction of iron powder
Implementation Method 2
a content of the activated carbon is 20 parts by mass or more and 40 parts by mass or less with respect to 100 parts by mass of a content of the iron powder
Implementation Method 3
a content of the halide of the alkaline earth metal is 50 parts by mass or more and 65 parts by mass or less with respect to 100 parts by mass of the content of the water
Data Source
AI summary
Disclosed is an oxygen scavenger composition including iron powder, activated carbon, water, a halide of an alkaline earth metal, and an alkaline substance, in which a content of the activated carbon is 20 parts by mass or more and 40 parts by mass or less with respect to 100 parts by mass of a content of the iron powder, a content of the water is 230 parts by mass or more and 370 parts by mass or less with respect to 100 parts by mass of the content of the activated carbon, and a content of the halide of the alkaline earth metal is 50 parts by mass or more and 65 parts by mass or less with respect to 100 parts by mass of the content of the water.