Metal Container Inert Headspace for Carboxylic Acid Color Stability
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Solution Overview
Problem
Saturated aliphatic C6-12 carboxylic acids degrade over time during storage and transport due to thermal stress, leading to discoloration, despite their high flash points and stability under ambient conditions, necessitating measures to maintain color stability and prevent contamination.
Innovation Solution
Using a metallic container with an inert gas atmosphere containing nitrogen, helium, neon, argon, krypton, xenon, hydrogen, carbon dioxide, or carbon monoxide above the liquid, maintaining a low molecular oxygen content to minimize oxidation and prevent degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adipic acid is stored in conventional containers with air atmosphere, then storage is simple and inexpensive, but degradation occurs due to oxidation and microbial growth
Solution Approach 1:
The patent applies an inert gas atmosphere (nitrogen or carbon dioxide) inside the container to replace air, preventing oxidation of adipic acid and inhibiting microbial growth. This inert environment eliminates the degradation pathways that occur in conventional air-filled containers, thereby improving storage stability without requiring complex chemical treatments or preservatives.
Solution Approach 2:
The patent introduces an oxygen scavenger (such as iron powder, ascorbic acid, or other reducing agents) as an intermediary substance that actively removes residual oxygen from the container headspace. This oxygen scavenger acts as a mediator between the adipic acid and the remaining oxygen, preventing oxidative degradation while maintaining a simple container structure.
2Duration of action of stationary object
If adipic acid is stored for long periods, then sufficient supply is ensured, but degradation increases over time
Solution Approach 1:
By maintaining an inert gas atmosphere throughout the storage period, the patent prevents time-dependent degradation reactions. The inert environment remains stable over extended storage durations, ensuring that adipic acid composition remains unchanged even after long storage periods, thus enabling both long duration and high stability simultaneously.
Solution Approach 2:
The patent performs preliminary action by filling the container with inert gas and adding oxygen scavengers before storage begins. This preliminary preparation creates a protective environment that prevents degradation from occurring during the entire storage duration, allowing the adipic acid to remain stable indefinitely without requiring continuous monitoring or intervention.
3Ease of operation
If conventional storage methods are used, then handling is simple, but contamination and degradation occur
Solution Approach 1:
The inert gas atmosphere serves as a protective barrier that prevents contamination from external sources while maintaining handling simplicity. The container is sealed with inert gas filling, which prevents microbial contamination and oxidation during storage and handling operations, eliminating harmful degradation products without complicating the handling procedure.
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 method significantly reduces degradation and discoloration of saturated aliphatic C6-12 carboxylic acids during storage and transport, ensuring high color stability and minimal contamination.
Implementation Method 1
degradation can be prevented or at least delayed, if contact with oxygen is avoided
Implementation Method 2
bacterial growth can be ruled out if the container is made of metal
Data Source
AI summary
An arrangement for the degradation stable storage and transport of a liquid comprising a non-substituted saturated aliphatic C6-12 carboxylic acid in which the liquid is surrounded by a metallic container and covered with an oxygen free or at least heavily oxygen depleted inert gas phase atmosphere above the liquid.