CO2 Pressurization for Perishable Liquid Preservation
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Solution Overview
Problem
The food industry faces challenges in extending the shelf life and ensuring safety of perishable organic liquids like milk and juices during transportation, as existing methods such as pasteurization and refrigeration are costly and can impact flavor and nutritional quality, while current carbon dioxide treatments are limited to high pressures that can precipitate proteins or lack suitable pressure vessels for bulk storage.
Innovation Solution
Cooling perishable organic liquids to the maximum extent and injecting them with carbon dioxide to create a pressurized environment of 20-50 psi, which suppresses pathogen growth without protein precipitation, allowing for extended storage and transport without spoilage using food-grade pressure vessels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pasteurization is used to reduce microbial growth, then safety is improved, but flavor quality and nutritional content deteriorate
Solution Approach 1:
The patent changes the parameter from thermal treatment (pasteurization) to pressurized carbon dioxide treatment. By adjusting pressure and CO2 concentration parameters, microbial growth is inhibited without the thermal damage that degrades flavor and nutrition, thus resolving the contradiction between safety and quality preservation
Solution Approach 2:
The patent uses carbon dioxide to create an inert pressurized atmosphere that suppresses microbial growth. This inert environment replaces the need for thermal pasteurization, achieving safety improvement while avoiding the harmful effects of heat treatment on flavor and nutritional quality
2Duration of action of stationary object
If refrigeration is used to extend shelf life, then duration of action is improved, but cost increases
Solution Approach 1:
The patent changes the preservation parameter from temperature-based (refrigeration) to pressure-based (CO2 pressurization). By adjusting pressure and gas concentration parameters, shelf life is extended without requiring continuous energy-intensive refrigeration, thus reducing operational costs while maintaining extended duration of action
3Reliability
If high pressure carbon dioxide is used to suppress microbial growth, then reliability is improved, but protein precipitation occurs
Solution Approach 1:
The patent optimizes the pressure parameter to a specific range (20-50 psi) where CO2 effectively suppresses microbial growth without reaching the threshold that causes protein precipitation. This parameter optimization resolves the contradiction by finding the optimal pressure level that achieves reliability improvement while maintaining composition stability
Solution Approach 2:
The patent applies partial action by using moderate CO2 pressure (20-50 psi) rather than extreme high pressure. This partial application of pressure is sufficient to inhibit microbial growth while remaining below the level that would cause protein precipitation, thus achieving the desired effect without harmful side effects
4Speed
If rapid shipment by truck is used, then speed is improved, but cost increases
Solution Approach 1:
The patent changes the preservation parameter to allow non-refrigerated transport by applying pressurized CO2. This enables use of standard trucking (faster than rail/ocean) without incurring refrigeration costs, thus achieving both speed improvement and cost reduction simultaneously
Solution Approach 2:
The patent extracts the refrigeration requirement from the transport system by replacing it with pressurized CO2 treatment. This removal of the refrigeration component allows use of faster, cheaper standard transport while maintaining product safety and quality
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 effectively extends the shelf life of perishable organic liquids by inhibiting microbial growth, reducing the need for repeated pasteurization and refrigeration, while maintaining flavor and nutritional quality, and enabling cost-effective transportation over longer distances.
Implementation Method 1
injecting them with carbon dioxide to create a pressurized environment of 20-50 psi, which suppresses pathogen growth without protein precipitation
Implementation Method 2
Cooling perishable organic liquids to the maximum extent
Data Source
AI summary
Carbon dioxide is dissolved in perishable liquids loaded into pressure vessels that are provided with low carbon dioxide head pressure so as to improve product shelf life, thereby providing options for more economical shipment, as by rail and ocean vessels and for extended transport by truck and to facilitate extended storage of perishable products and to avoid the necessity of multiple treatments for pathogen reduction.