Low-Temperature Fat Rendering for Impurity Removal
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Solution Overview
Problem
Animal waste feedstock containing fat solids poses challenges due to high levels of phosphorous, nitrogen, and metal impurities, which can lead to catalyst deactivation and NOx emissions during processing, requiring effective purification methods to prevent these issues.
Innovation Solution
A method involving low-temperature fat rendering, heat-treatment, and bleaching with acid and sorbents to isolate and remove impurities from animal waste feedstock, optimizing the process to minimize nitrogen content and reduce ammonia formation, using a heat exchanger for even heating and a separator to facilitate liquefaction and separation of fat solids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional high-temperature dry rendering is used, then fat solids are effectively liquefied, but nitrogen content increases and catalyst deactivation occurs
Solution Approach 1:
The patent changes the temperature parameter from conventional high-temperature dry rendering to low-temperature wet rendering (below 100°C), which fundamentally alters the chemical reactions occurring during fat solids liquefaction. This parameter change prevents nitrogen-containing compounds from forming while still achieving effective fat rendering through water-assisted liquefaction at lower temperatures.
Solution Approach 2:
The patent introduces water as an intermediary substance in the rendering process. Water facilitates the liquefaction of fat solids at low temperatures through hydrolysis and emulsification actions, replacing the need for high-temperature dry heating. This intermediary enables effective fat rendering while preventing the formation of harmful nitrogen compounds that would otherwise form under conventional high-temperature conditions.
2Productivity
If hydrogenation processing is applied, then fat solids are converted to traffic fuels, but toxic ammonia is generated from nitrogen compounds
Solution Approach 1:
The patent applies preliminary low-temperature wet rendering and bleaching treatment before the hydrogenation step. This preliminary action removes nitrogen-containing impurities and stabilizes the fat solids composition, ensuring that when hydrogenation is subsequently applied, no toxic ammonia is generated from nitrogen compounds. The harmful factor is eliminated in advance before the main processing step.
3Manufacturing precision
If impurities are removed through multiple processing steps, then feedstock purity is improved, but processing complexity increases
Solution Approach 1:
The patent combines multiple impurity removal functions into integrated processing steps. The low-temperature wet rendering process simultaneously liquefies fat solids and begins impurity separation. The bleaching step combines adsorption of impurities with color removal. By merging these functions into coordinated steps rather than separate sequential operations, the process achieves high purity while managing complexity through functional integration.
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 method effectively reduces impurity levels, minimizing the need for further processing steps and lowering NOx emissions, resulting in a high-quality feedstock suitable for biofuel production that reduces catalyst poisoning and ammonia generation.
Implementation Method 1
The animal waste feedstock is heated to an elevated temperature of 100 °C or below to liquefy the fat solids
Implementation Method 2
The liquefied fat is isolated from solid material to obtain isolated liquefied fat
Implementation Method 3
In bleaching, removal of impurities is achieved using adsorption on clay
Data Source
Figure 1
AI summary
A method is disclosed for purifying animal waste feedstock. The method comprises providing animal waste feedstock (100) containing fat solids, and heating said animal waste feedstock (100) to an elevated temperature of 100 °C or below to liquefy (102) the fat solids in the animal waste feedstock (100), thereby obtaining liquefied fat. The liquefied fat is isolated from solid material to obtain isolated liquefied fat. The isolated liquefied fat is subjected to bleaching (106) in the presence of acid (113) and sorbent to obtain bleached liquefied fat.