Oxygen-Scavenging Packaging Using High-Concentration Hydrogen
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Solution Overview
Problem
The shelf-life of oxygen-sensitive substances in permeable containers is shortened due to molecular oxygen ingress, and existing de-oxygenation methods using low hydrogen concentrations are inefficient in increasing shelf-life while posing safety concerns regarding flammability.
Innovation Solution
Introducing a de-oxygenating gas containing at least 75% molecular hydrogen into a container with a catalyst, such as palladium, to promote a reaction between hydrogen and oxygen, thereby extending the shelf-life of oxygen-sensitive substances without flammability risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low concentration of hydrogen (not more than 5.5% H2) is used in the gas mixture to avoid flammability, then safety is improved, but the shelf-life extension effect is insufficient because molecular H2 is quickly consumed
Solution Approach 1:
The patent fundamentally changes the hydrogen concentration parameter from the conventional low level (≤5.5%) to a high level (≥75%), thereby transforming the chemical reaction dynamics. This parameter change allows sufficient hydrogen to be present to react with ingress oxygen over extended periods, achieving long-term shelf-life extension while maintaining safety through the catalyst's controlled reaction promotion.
Solution Approach 2:
The patent introduces a catalyst as an intermediary substance that mediates the reaction between hydrogen and oxygen. The catalyst enables the reaction to proceed at controlled rates even at high hydrogen concentrations, preventing uncontrolled combustion while ensuring complete oxygen scavenging. This intermediary allows the system to operate safely at high H2 levels that would otherwise be flammable.
2Object-affected harmful factors
If multilayered containers with gas barrier layers are used to prevent oxygen ingress, then oxygen barrier properties are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the oxygen barrier function from the container structure itself and relocates it to the internal atmosphere composition. Instead of relying on complex multilayered walls to prevent oxygen ingress, the system uses a hydrogen-catalyst atmosphere that chemically scavenges any oxygen that enters, thereby simplifying the container structure while maintaining protection.
Solution Approach 2:
The patent converts the potentially harmful presence of oxygen that penetrates through permeable container walls into a beneficial chemical reaction. The ingress oxygen is not prevented but instead is actively consumed by reacting with hydrogen in the presence of a catalyst, transforming the harmful oxidizing agent into harmless water and thereby extending shelf-life.
3Ease of manufacture
If containers permeable to molecular oxygen are used for packaging, then ease of manufacture and material flexibility are improved, but oxygen-sensitive substances are detrimentally oxidized by oxygen penetration
Solution Approach 1:
The patent accepts the permeability of simple container materials and converts the harmful oxygen penetration into a beneficial effect. The oxygen that enters through the permeable walls is chemically scavenged by the hydrogen-catalyst system, transforming the material limitation into an opportunity for active oxygen management that extends shelf-life while maintaining manufacturing simplicity.
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
This method significantly increases the shelf-life of oxygen-sensitive substances by effectively scavenging oxygen with high hydrogen concentrations, demonstrating that using up to 100% hydrogen is safe and effective in ambient conditions, as shown by the prolonged oxygen consumption and low dissolved oxygen levels in experimental tests.
Implementation Method 1
a catalyst is used inside the container and/or in the container wall and/or in the closure for promoting a reaction between molecular hydrogen and molecular oxygen
Implementation Method 2
molecular H2 reacts with oxygen for producing water
Data Source
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AI summary
The method for packaging an oxygen-sensitive substance into a container, comprises the following steps : - the oxygen-sensitive substance is introduced into the container, - a de-oxygenating gas containing at least 75% of molecular hydrogen is introduced inside the container containing the oxygen-sensitive substance, - the container containing the oxygen-sensitive substance and the de-oxygenating gas is hermetically closed with a closure, and a catalyst is used inside the container and/or in the container wall and/or in the closure for promoting a reaction between molecular hydrogen and molecular oxygen inside the container.