Bio-Feedstock Pretreatment via Aqueous Thermal Purification
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Solution Overview
Problem
Current industrial processes for pretreating and purifying crude vegetable oils and animal fats for biofuel production are complex, costly, and environmentally unsustainable due to the use of large quantities of chemicals and the generation of significant waste, failing to effectively reduce metal pollutants and phosphorus to the required levels without altering the chemical nature of the feedstock.
Innovation Solution
A simplified process involving a non-catalytic thermal treatment of an aqueous emulsion of crude bio-feedstocks in a heated, pressurized coil reactor, followed by non-absorbent physical separation, effectively reduces metal contaminants and phosphorus to less than 10 ppm in a single stage, without using absorbent materials or high-pressure vapor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional pretreatment processes (degumming, bleaching, deodorizing) are used in series, then metal pollutants and phosphorus are removed to required levels, but the process complexity and chemical consumption increase significantly
Solution Approach 1:
The patent combines multiple conventional pretreatment steps (degumming, bleaching, deodorizing) into a single integrated thermal treatment process. The crude bio-feedstock is heated to 100-200°C in the presence of water and optionally an acid catalyst, achieving simultaneous removal of phospholipids, metals, and other impurities that would traditionally require separate sequential processes
Solution Approach 2:
The thermal treatment process performs multiple functions simultaneously: it acts as a degumming agent by hydrolyzing phospholipids, serves as a bleaching mechanism through thermal decomposition of colored impurities, and functions as a deodorizing step by volatilizing volatile compounds. This single process replaces multiple specialized treatment units
2Manufacturing precision
If conventional pretreatment processes are used, then contaminants are removed, but large quantities of chemicals are consumed and significant waste is generated
Solution Approach 1:
The process uses water as the primary reagent, which is abundant and produces minimal waste. The thermal treatment naturally decomposes impurities without requiring large amounts of external chemicals. The only additional substance optionally used is a small amount of acid catalyst that facilitates the reaction but does not create significant waste streams
Solution Approach 2:
The process converts the thermal energy that would otherwise be wasted into a useful function by using heat to simultaneously hydrolyze phospholipids, decompose colored impurities, and volatilize unwanted compounds. The water present in the system, which could potentially cause emulsion problems, is instead utilized as the reaction medium and heat transfer fluid
3Manufacturing precision
If conventional pretreatment processes are used, then phosphorus and metal contaminants are reduced to less than 10 ppm, but the process requires multiple stages and high operating costs
Solution Approach 1:
The process achieves superior contaminant removal by optimizing specific parameters: temperature (100-200°C), water-to-oil ratio (5-50% by weight), and optionally acid concentration (0.1-5% by weight). These parameter optimizations enable a single-stage process that matches or exceeds the purification performance of multi-stage conventional processes at lower cost
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 achieves efficient removal of contaminants with reduced complexity, lower operating costs, and minimal waste production, making it more environmentally sustainable and suitable for high-contaminant feedstocks, while maintaining the chemical nature of the oil.
Implementation Method 1
subjecting said aqueous emulsion to a heat treatment at high temperature, greater than 100° C., by passing it into a coil, or in at least one tube, heated of a reactor
Implementation Method 2
non-catalytic thermal treatment of an aqueous emulsion of crude bio-feedstocks
Implementation Method 3
non-absorbent physical separation, effectively reduces metal contaminants and phosphorus to less than 10 ppm
Data Source
AI summary
A method for pretreating and purifying crude bio-feedstocks intended for processes of transformation into biofuels is described, the method being characterized in that the crude bio-feedstock is subjected, in the form of an aqueous emulsion to a heat treatment by passing it through a coil visbreaker furnace at a temperature greater than 100° C. and a pressure greater than 3 barg, possibly in an inert atmosphere, for a pre-established contact/residence time, the effluent exiting the reactor being subsequently subjected to at least a non-absorbent physical separation to separate the bio-feedstock from metal contaminants and phosphorus.