Cocoa Butter Biodiesel Cold Stabilization for Low Cloud Point
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Solution Overview
Problem
Biodiesel produced from traditional methods suffers from high cloud points, leading to crystallization and clogging in cold temperatures, and existing solutions like blending with petroleum diesel or using additives are environmentally unfriendly or ineffective.
Innovation Solution
A two-step cold stabilization process involving desaturation of cocoa butter using a fatty acid desaturase followed by transesterification and urea clathration to form clathrates, which are then separated, reducing the cloud point to as low as -61°F (-52°C).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If biodiesel is produced from cocoa butter using traditional methods, then the production process is simple, but the cloud point is too high (59-62°F) causing crystallization in cold temperatures
Solution Approach 1:
The production process is divided into distinct segments: desaturation step, transesterification step, and cold stabilization step. Each segment addresses a specific aspect of the problem, allowing systematic control over the cloud point while maintaining overall process manageability
Solution Approach 2:
Desaturation of cocoa butter is performed before transesterification to modify the fatty acid composition in advance. This preliminary action reduces the saturation level of the feedstock, which directly lowers the cloud point of the resulting biodiesel without requiring extensive post-processing
2Temperature
If cloud point is lowered by blending with petroleum diesel, then the cloud point decreases, but environmental harm increases due to continued reliance on fossil fuels and emissions
Solution Approach 1:
The naturally occurring saturated fatty acids in cocoa butter, which cause high cloud point and potential harm, are converted into beneficial unsaturated fatty acids through enzymatic desaturation. This transforms the harmful saturated components into useful unsaturated components that lower cloud point and improve cold-weather performance
Solution Approach 2:
The chemical composition parameters of the biodiesel are fundamentally changed by modifying the fatty acid saturation level. By converting saturated fatty acids to unsaturated fatty acids, the cloud point parameter is reduced from 59-62°F to below 32°F, enabling use in cold temperatures without petroleum blending
3Temperature
If cloud point is lowered by adding additives, then the cloud point decreases, but cost increases and carcinogenic substances are introduced
Solution Approach 1:
The cocoa butter feedstock itself is modified through desaturation to inherently possess low cloud point properties. The biodiesel produces its own cold-weather suitability through the modified fatty acid composition, eliminating the need for external additives or treatments to achieve low cloud point performance
4Temperature
If winterization is used to lower cloud point, then the cloud point decreases, but the resulting biodiesel may still have too high cloud point for broad commercial use
Solution Approach 1:
The fundamental chemical parameter of fatty acid saturation is changed through desaturation, rather than merely physically separating components. This creates biodiesel with inherently low cloud point properties that adapt to a broad temperature range, achieving cloud points below 32°F suitable for diverse commercial applications across different climates
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 biodiesel with a significantly lower cloud point, eliminating the need for environmentally harmful additives or blending, utilizing renewable and recyclable materials, and achieving performance comparable to petroleum diesel.
Implementation Method 1
desaturating cocoa butter using a fatty acid desaturase to thereby produce a desaturated cocoa butter
Implementation Method 2
performing urea clathration on the biodiesel to thereby form clathrates in the biodiesel
Data Source
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AI summary
Methods of producing a biodiesel derived from cocoa butter and in which the biodiesel possesses a cloud point as low as -51°C generally include a two-step cold stabilization process in which at least two separate processes primarily aimed at reducing the cloud point of the resultant biodiesel are carried out.