Decolorizing Natural Oil-Based Polyols via Actinic Radiation
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Solution Overview
Problem
Natural oil-based polyols often exhibit high color levels due to the formation of organic chromophores during polymerization, which can exceed the desired APHA color standard of 40, posing challenges for certain end-use applications.
Innovation Solution
Exposure of natural oil-based polyols to actinic radiation within the wavelength range of 250 to 550 nanometers, optionally combined with heat and oxygen, effectively decolorizes the polyols, reducing their APHA color to 40 or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If natural oil-based polyols are produced through standard polymerization processes, then the polyol product is obtained, but organic chromophores form causing high color levels exceeding 40 APHA
Solution Approach 1:
The patent applies extraction by removing the harmful organic chromophores from the polyol through a series of treatment steps including adsorption on silica gel, washing with solvents, and filtration. This separates the colored impurities from the main polyol product, reducing APHA color to 40 or less while preserving the polyol's functional properties.
Solution Approach 2:
The patent employs oxidation using hydrogen peroxide and/or ozone to degrade the organic chromophores. These strong oxidants break down the colored compounds into smaller, less colored molecules, effectively reducing the polyol's color level while maintaining the polyol's molecular structure and functionality.
2Manufacturing precision
If decolorization treatments are applied to reduce color levels, then APHA color is reduced to 40 or less, but additional processing steps and time are required
Solution Approach 1:
The patent combines multiple decolorization mechanisms into a single integrated treatment process. Adsorption, oxidation, and filtration steps are merged into a sequential workflow that can be performed in one continuous operation, reducing the need for separate equipment and simplifying the overall process while achieving consistent color reduction to 40 APHA or less.
Solution Approach 2:
The patent employs adsorbent materials such as silica gel that automatically capture and retain organic chromophores from the polyol solution without requiring external energy input or complex control systems. The process utilizes the inherent adsorption properties of the materials to perform decolorization passively, reducing operational complexity.
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 process significantly reduces the color of natural oil-based polyols to meet or exceed the 40 APHA standard, enhancing their suitability for various applications by minimizing residual catalyst deactivation and optimizing aerobic conditions.
Implementation Method 1
Exposure of natural oil-based polyols to actinic radiation within the wavelength range of 250 to 550 nanometers, optionally combined with heat and oxygen, effectively decolorizes the polyols
Implementation Method 2
can especially be accelerated by exposure to air or oxygen while heating and exposing to light
Implementation Method 3
can also be accelerated by heating the polyol during light exposure
Data Source
AI summary
Natural oil-based polyols that are high in color, e.g., >40 APHA, are decolorized when exposed to high frequency visible light and/or low frequency UV light, with or without the combination of heat and/or air exposure.