Hydroxy Functional Vegetable Oils via Hydrogen Peroxide Oxidation
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Solution Overview
Problem
Commercially available soy-based hydroxy functional compounds have an unpleasant odor and are not freeze/thaw stable, which hinders their commercial success in polyurethane manufacturing due to issues like odor transfer into products and downstream handling problems.
Innovation Solution
A process involving contacting raw vegetable oils with hydrogen peroxide and an organic acid in the presence of water to convert unsaturated moieties into hydroxyl groups, resulting in hydroxy functional vegetable oils that are non-malodorous and freeze/thaw stable, using specific conditions such as temperature, pressure, and phase separation to produce pure polyols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional hydrolysis methods using water catalyzed by enzymes, acids, or metals are used to convert triglycerides, then glycerol products are obtained, but the products retain unsaturation and do not achieve the desired hydroxyl functionality
Solution Approach 1:
The patent changes the chemical reaction parameters by using hydrogen peroxide instead of conventional hydrolysis catalysts, transforming the reaction pathway from simple hydrolysis to oxidation-hydrolysis sequence, which achieves complete conversion to hydroxyl groups and eliminates residual unsaturation
Solution Approach 2:
Hydrogen peroxide is used as a strong oxidant to convert the unsaturated moieties of triglycerides into hydroxyl groups through epoxidation followed by hydrolysis, achieving complete functional transformation and eliminating harmful unsaturation
2Productivity
If conventional soy-based polyols are used, then polyurethane manufacturing can proceed, but the products have unpleasant odor that transfers into articles like foam
Solution Approach 1:
The patent converts the harmful unsaturated moieties that cause odor into beneficial hydroxyl groups through oxidation, transforming the source of the problem into the desired functional group for polyurethane synthesis
3Temperature
If conventional soy polyols are cooled to about 10° C. or frozen, then the process can be continued, but visible solids precipitate out and cause downstream handling problems
Solution Approach 1:
The patent uses a straightforward chemical transformation that produces a stable end product requiring no special handling precautions, making the process as robust as disposable single-use systems that eliminate complex recovery steps
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 produces hydroxy functional vegetable oils that are low in odor, color, and water content, with improved freeze/thaw stability, reducing handling issues and enhancing their suitability for polyurethane manufacturing by providing a stable and odor-free product.
Implementation Method 1
contacting a raw vegetable oil with hydrogen peroxide and an organic acid in the presence of water for a sufficient period of time to form a hydroxy ester from unsaturated moieties in the vegetable oil
Implementation Method 2
combining hydrogen peroxide and acetic acid in water to form an aqueous phase and adding the aqueous phase to the organic phase
Implementation Method 3
separating any volatiles from the hydroxy functional vegetable oil
Data Source
AI summary
Simple, economical preparative processes for the provision of pure hydroxyl functional materials that are derived by converting the alkene groups of the unsaturated molecules found in vegetable oils, into hydroxyl groups.