Fat Rendering Purification via Low-Temperature Liquefaction and Acid Bleaching
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Solution Overview
Problem
Animal waste feedstock containing fat solids and nitrogen-containing compounds poses challenges in purification due to the presence of impurities like phosphorus, nitrogen, and metals, which can lead to catalyst deactivation, NOx emissions, and the formation of toxic ammonia during processing.
Innovation Solution
A method involving fat rendering at elevated temperatures below 100°C to liquefy fat solids, followed by isolation of liquefied fat from solid material, and subsequent bleaching with acid and sorbent to remove impurities, thereby obtaining nitrogen-depleted liquefied fat suitable for biofuel production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high temperature dry rendering process is used to purify waste feedstock, then fat solids are effectively liquefied and separated, but nitrogen compounds decompose to form toxic ammonia and catalyst deactivation occurs
Solution Approach 1:
The patent changes the temperature parameter from conventional high temperature (above 100°C) to low temperature (below 100°C, specifically 40-90°C) during the rendering process. This parameter change prevents the decomposition of nitrogen compounds that would otherwise form toxic ammonia, while still achieving effective liquefaction and separation of fat solids through extended processing time at the lower temperature
Solution Approach 2:
The patent applies preliminary acid treatment to the waste feedstock before the rendering process. This preliminary action converts nitrogen compounds into more stable forms that do not decompose to ammonia during rendering, and also pre-removes some impurities that would otherwise require harsher processing conditions
2Manufacturing precision
If conventional heat-treatment is used to precipitate impurities, then phosphorous and metal impurities are removed, but water consumption increases requiring extensive wastewater treatment
Solution Approach 1:
The patent extracts and removes water from the system by operating the entire rendering and purification process at temperatures below 100°C, preventing water evaporation and minimizing the need for water-intensive washing and treatment steps. Impurities are precipitated and separated using minimal water, and the low temperature operation allows direct processing of the feedstock with reduced water addition
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 the nitrogen content in the liquefied fat, minimizing the formation of unwanted nitrogen derivatives and improving the quality of the feedstock for biofuel production, while also reducing water consumption and associated wastewater treatment costs.
Implementation Method 1
The feedstock is heated to an elevated temperature to liquefy the fat solids in the feedstock
Data Source
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.