Biodiesel Hydrogenation Catalyst Low Pressure Selective Conversion
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Solution Overview
Problem
Biodiesel fuels with high polyunsaturated fatty acid content face challenges in oxidative stability and low temperature fluidity due to the formation of trans-isomers during hydrogenation, leading to poor engine performance and storage issues.
Innovation Solution
A method involving a hydrogenation catalyst with noble metals supported on a porous inorganic oxide with low acidic sites, operating under low hydrogen pressure to selectively convert polyunsaturated fatty acid alkyl esters to mono-unsaturated esters while minimizing trans-isomer formation, thereby enhancing oxidative stability and low temperature fluidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogenation is performed under high pressure to improve oxidative stability, then oxidative stability is improved, but trans-isomer formation increases leading to poor low temperature fluidity
Solution Approach 1:
The patent changes the pressure parameter from conventional high pressure (10-50 MPa) to low pressure (0.1-5 MPa) hydrogenation. This parameter change allows achieving the same oxidative stability improvement (reducing polyunsaturated fatty acid alkyl esters) without the harmful side effect of excessive trans-isomer formation, thereby maintaining low temperature fluidity
Solution Approach 2:
The patent uses a composite catalyst system comprising a supported metal catalyst (noble metal or base metal on inorganic oxide support) combined with specific reaction conditions. This composite approach enables selective hydrogenation at low pressure, achieving both oxidative stability improvement and fluidity preservation that neither simple high-pressure hydrogenation nor conventional catalysts alone can achieve
2Reliability
If conventional hydrogenation catalysts are used to improve oxidative stability, then polyunsaturated fatty acid alkyl esters are converted, but trans-isomer content increases causing precipitation at low temperatures
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: low hydrogen pressure (0.1-5 MPa), controlled temperature (40-150°C), and specific catalyst composition. These parameter changes work together to achieve selective conversion of polyunsaturated fatty acid alkyl esters while minimizing trans-isomer formation, maintaining fluidity stability
Solution Approach 2:
The patent employs noble metal catalysts (Pd, Pt, Rh, Ir, Ru) that replicate the high selectivity and activity of natural enzymatic hydrogenation at much lower pressures. These noble metals copy the selective hydrogenation capability needed to convert polyunsaturated bonds without excessive trans-isomer formation that plagues conventional catalysts
3Reliability
If high pressure hydrogenation facilities are installed to produce stable biodiesel, then oxidative stability is achieved, but device complexity and investment cost increase
Solution Approach 1:
The patent fundamentally changes the pressure parameter from high (10-50 MPa) to low (0.1-5 MPa), which dramatically simplifies the required equipment. Low pressure hydrogenation eliminates the need for complex high-pressure reactors, thick-walled vessels, and sophisticated pressure control systems, reducing both device complexity and investment cost while maintaining oxidative stability
Solution Approach 2:
The patent uses base metal catalysts (Ni, Cu, Zn, Fe, Co, Mn) supported on inorganic oxides as cost-effective alternatives to expensive noble metal catalysts. These catalysts provide sufficient activity at low pressure, reducing catalyst cost and making the overall process more economically viable for large-scale production
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 produces biodiesel with improved oxidative stability and fluidity at low temperatures, meeting stringent quality control standards without the need for high-pressure facilities or additional antioxidants, and allows for blending with petroleum diesel.
Implementation Method 1
hydrogenating (1) a fatty acid alkyl ester prepared from fat and/or waste edible oil by transesterification reaction, and/or (2) a fatty acid alkyl ester treated by esterification reaction of a fatty acid in the presence of a hydrogenation catalyst containing at least one of noble metals selected from those of Groups 8-10 in the periodic table under low hydrogen pressure
Implementation Method 2
in the presence of a hydrogenation catalyst containing at least one of noble metals selected from those of Groups 8-10 in the periodic table supported on a porous inorganic oxide having a small number of acidic sites
Data Source
AI summary
Provided is a method for producing biodiesel fuel having an excellent oxidative stability and fluidity at low temperature, wherein the method provides selective hydrogenation of a poly-unsaturated fatty acid alkyl ester to the mono-unsaturated fatty acid alkyl ester while inhibiting the formation of the trans-isomer, and a biodiesel fuel composition. In the method for producing biodiesel fuel, a fatty acid alkyl ester prepared from fat and/or waste edible oil by transesterification reaction, and/or (2) a fatty acid alkyl ester treated by esterification reaction of a fatty acid is hydrogenated in the presence of a hydrogenation catalyst containing at least one of noble metals selected from those of Groups 8-10 in the periodic table under low hydrogen pressure.