Isomerization Dewaxing Catalyst for Biodiesel Cold Flow
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Solution Overview
Problem
Current methods for producing biodiesel fuels from biocomponent sources often result in blends with unfavorable cold flow properties and high cloud points, making them unsuitable for commercial use, particularly in extreme cold climates.
Innovation Solution
A method involving mixing a biocomponent feed with a mineral feedstock and contacting it with an isomerization/dewaxing catalyst, specifically a molecular sieve like ZSM-48 and a Group VIII metal, under effective isomerization/dewaxing conditions to achieve a cloud point of -20°C or less, while removing oxygen content and improving cetane values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If biodiesel is blended with conventional diesel to meet diesel specifications, then fuel composition requirements are satisfied, but cloud point increases making the blend unsuitable for cold climates
Solution Approach 1:
The patent applies parameter changes by modifying the molecular structure of biodiesel components through isomerization. The process converts normal paraffins to iso-paraffins and branched structures, which have lower cloud points while maintaining diesel specification compliance. This chemical transformation changes the physical properties of the fuel without altering its fundamental composition.
Solution Approach 2:
The patent creates a composite fuel system by combining conventional diesel with isomerized biodiesel components. The isomerization process produces a mixture of hydrocarbon isomers that blend with conventional diesel to create a composite fuel with improved cold flow properties while maintaining the benefits of biodiesel blending.
2Temperature
If isomerization catalysts are used to reduce cloud point, then cold flow properties improve, but n-paraffin content remains high limiting further cloud point reduction
Solution Approach 1:
The patent merges two previously separate processes into a single integrated isomerization-dewaxing step. By combining the isomerization catalyst (for converting normal paraffins to iso-paraffins) with a dewaxing catalyst (for removing n-paraffins), the process achieves both cloud point reduction and n-paraffin removal simultaneously, breaking the limitation that prevented further cloud point improvement.
Solution Approach 2:
The patent employs a composite catalyst system containing both isomerization and dewaxing functional components. This composite catalyst enables dual functionality: isomerizing normal paraffins to improve cold flow while simultaneously dewaxing to remove n-paraffins that would otherwise limit cloud point reduction, achieving synergistic effects greater than either catalyst alone.
3Device complexity
If single step hydroprocessing is used to perform hydrodeoxygenation and hydroisomerization, then process complexity is reduced, but cloud points remain above -20°C
Solution Approach 1:
The patent merges hydrodeoxygenation and hydroisomerization-dewaxing into a single integrated process step. By using a multifunctional catalyst that performs deoxygenation, isomerization, and dewaxing simultaneously, the process achieves cloud points below -20°C without requiring multiple sequential processing steps, thus reducing overall process complexity while improving performance.
Solution Approach 2:
The patent employs a composite catalyst material that integrates multiple functional components: metal sites for hydrodeoxygenation, acid sites for isomerization, and dewaxing capabilities. This composite catalyst enables all necessary reactions to occur in one step, achieving superior cloud point reduction while maintaining process simplicity.
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 cloud points and improves cold flow properties of biodiesel fuels, making them suitable for commercial use and enhancing cetane values, thus addressing the limitations of existing biodiesel production techniques.
Implementation Method 1
contacting the combined feedstock with an isomerization/dewaxing catalyst... under effective isomerization/dewaxing conditions including a temperature of at least about 350°C and being effective to remove about 99% of the oxygen content
Implementation Method 2
contacting the combined feedstock with an isomerization/dewaxing catalyst... under effective isomerization/dewaxing conditions
Implementation Method 3
contacting the combined feedstock with an isomerization/dewaxing catalyst... to produce an isomerized/dewaxed product having a cloud point of about -20°C or less
Data Source
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AI summary
Non-hydrotreated biocomponent feeds can be mixed with mineral feeds and processed under catalytic isomerization/dewaxing conditions. The catalytic isomerization/dewaxing conditions can be selected to advantageously also substantially deoxygenate the mixed feed. Diesel fuel products with improved cold flow properties can be produced.