Fiber Conduit Contactor for Biodiesel Phase Separation
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Solution Overview
Problem
Existing methods for producing biodiesel through transesterification face challenges such as difficult phase separation, high alcohol requirements, and the formation of persistent emulsions, which complicate the purification process.
Innovation Solution
The use of a fiber conduit contactor provides a large surface area for the reaction between vegetable oils and alcohol, allowing for a single-stage process that can produce a single-phase reaction product, even at high ethanol molar ratios, facilitating efficient biodiesel conversion and subsequent phase separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If dispersion methods are used to react feedstock oil and alcohol, then reaction surface area is increased, but phase separation becomes difficult and time-consuming
Solution Approach 1:
The reaction system is segmented into distinct phases that remain separable. The fiber conduit contactor provides segmentation of the liquid phases while maintaining their separability, allowing reaction surface area to be increased without forming difficult-to-separate emulsions.
Solution Approach 2:
The fiber conduit contactor acts as an intermediary device that facilitates mass transfer between immiscible phases without creating stable emulsions. The fiber structure provides a medium for phase contact while preventing the formation of difficult-to-separate dispersions.
2Productivity
If high molar ratios of alcohol to triglyceride are used, then transesterification conversion is improved, but single-phase formation occurs making washing complicated
Solution Approach 1:
The process parameters are optimized to achieve high conversion while maintaining phase separability. By controlling the molar ratio and using the fiber conduit contactor, the system achieves >99% conversion while preventing the formation of persistent emulsions that would complicate washing.
Solution Approach 2:
The potential harm of high alcohol ratios forming single-phase mixtures is converted into a benefit by using the fiber conduit contactor. The device allows high conversion to proceed while the fiber structure prevents emulsion formation, turning what would be a washing complication into an efficient separation process.
3Ease of operation
If fiber conduit contactor is used to avoid dispersion formation, then phase separation is simplified, but reaction surface area may be limited
Solution Approach 1:
The fiber conduit contactor utilizes a porous fiber structure that provides extensive surface area for mass transfer between phases. The porous nature of the fibers creates numerous contact points while maintaining phase separability, resolving the contradiction between surface area and ease of separation.
Solution Approach 2:
The fiber conduit contactor introduces a new dimension to the reaction system by using a three-dimensional fiber network. This structure provides large surface area without creating planar dispersions, allowing phases to remain separable while maintaining high reaction efficiency.
4Manufacturing precision
If water washing is required to remove impurities, then product purity is improved, but operational complexity and time increase
Solution Approach 1:
The fiber conduit contactor extracts the separation function from the washing process. By preventing emulsion formation at the source through its fiber structure, the device eliminates the need for prolonged washing and settling times, achieving both high purity and operational efficiency.
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 approach enables high biodiesel conversion rates (>99%) in a continuous process, simplifying the separation and purification steps by allowing for a single wash step in the fiber conduit contactor, thereby reducing operational complexity and increasing efficiency.
Implementation Method 1
A fiber conduit contactor may be employed to provide increased surface area to facilitate reaction between immiscible liquids
Implementation Method 2
When employing a fiber conduit contactor, the immiscible liquids are generally not permitted to mix to form a dispersion or an emulsion, and the output therefrom generally includes two distinct phases
Implementation Method 3
One method of producing biodiesel is by transesterification of a feedstock oil. Transesterification is the reaction of a lipid with an alcohol to form esters and a byproduct, glycerol
Implementation Method 4
it is believed that the solubility of the ethanol in both the biodiesel (ester) and the glycerol (the caustic phase) renders these phases soluble in each other, which results in the single-phase reaction product
Data Source
AI summary
A method of producing biodiesel using a conduit contactor in fluid communication with a collection vessel includes: introducing a first stream including an alcohol proximate a plurality of fibers positioned within the conduit contactor and extending proximate to the collection vessel; introducing a second stream including an oil into the conduit contactor proximate to the plurality of fibers, wherein the second stream is in contact with the first stream; reacting the oil and the alcohol to for a single phase; receiving the single phase in the collection vessel; and separating biodiesel from the single phase.