Bifunctional Catalyst for Lipid Hydroisomerization
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Solution Overview
Problem
Current processes for producing second-generation biodiesel from lipids require a two-step process involving hydrogenation, deoxygenation, and hydroisomerization, which consumes large amounts of hydrogen and requires significant investment due to the need for multiple catalysts and separate units, and are limited by water generation that can poison isomerizing catalysts.
Innovation Solution
A single-step process using a catalyst composition with an active metal supported by a zeolite or SAPO acidic support, which facilitates hydrogenation, deoxygenation, and hydroisomerization simultaneously, reducing water generation and hydrogen consumption, and producing a high proportion of branched alkanes suitable for diesel and jet fuels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a two-step process with separate hydrogenation/deoxygenation and hydroisomerization units is used, then the product can achieve high iso-paraffin content, but the device complexity and capital investment increase significantly
Solution Approach 1:
The patent combines hydrogenation, deoxygenation, and hydroisomerization functions into a single catalytic unit with a bifunctional catalyst. The catalyst contains metal sites for hydrogenation/deoxygenation and acid sites for hydroisomerization, eliminating the need for separate processing units while achieving high iso-paraffin content (>60%) in the product
Solution Approach 2:
The bifunctional catalyst performs multiple functions simultaneously: metal sites (Ni, Co, Mo, or Pt) catalyze hydrogenation and deoxygenation reactions, while acid sites (zeolite or SAPO) catalyze hydroisomerization. This multi-functional catalyst system replaces multiple specialized catalysts and processing units, reducing device complexity while maintaining product quality
2Productivity
If conventional hydrotreating catalysts are used for hydrogenation and deoxygenation, then the reactions proceed effectively, but water is generated that poisons the isomerizing catalyst
Solution Approach 1:
The patent uses a bifunctional catalyst system where metal sites act as intermediaries for hydrogenation and deoxygenation, and acid sites act as intermediaries for hydroisomerization. By integrating both functions in one catalyst, the system manages water generation internally without allowing it to poison the isomerization function, as both reactions occur simultaneously in the same catalytic environment
Solution Approach 2:
The patent merges the hydrogenation/deoxygenation catalyst and hydroisomerization catalyst into a single bifunctional catalyst. This integration allows the system to handle water generation and isomerization in the same unit, preventing water from poisoning separate isomerization catalysts while maintaining high productivity for all reactions
3Productivity
If multiple catalysts are used for different reaction steps, then each reaction can be optimized, but the capital investment and process complexity increase
Solution Approach 1:
The bifunctional catalyst provides universal activity for hydrogenation, deoxygenation, and hydroisomerization reactions. The metal component (Ni, Co, Mo, or Pt) handles saturation and deoxygenation, while the acid component (zeolite or SAPO) handles isomerization, allowing a single catalyst to replace multiple specialized catalysts and reduce capital investment
4Ease of manufacture
If first generation biodiesel (FAME) is produced through transesterification, then the process is simple and well-established, but the product has low stability, low energy value, high viscosity, and high freezing point
Solution Approach 1:
The patent changes the chemical parameters of the biodiesel production process by using hydrogenation and deoxygenation instead of transesterification. This converts unsaturated esters into saturated hydrocarbons (iso-paraffins), fundamentally changing the product's chemical structure to achieve high stability, high energy value, low viscosity, and low freezing point while maintaining ease of manufacture through a single-step catalytic process
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 single-step process reduces hydrogen consumption and capital costs, produces biodiesel with high cetane value, low freezing point, and low sulfur content, and enables the production of fungible biofuels from renewable resources with improved stability and energy efficiency.
Implementation Method 1
hydrogenation, deoxygenation and hydroisomerization of the lipid feedstock
Implementation Method 2
deoxygenation...the oxygen atoms of the lipid feedstock are mainly converted to CO and CO2...through hydrodecarbonylation and hydrodecarboxylation
Implementation Method 3
deoxygenation...the oxygen atoms of the lipid feedstock are mainly converted to CO and CO2...through hydrodecarbonylation and hydrodecarboxylation
Implementation Method 4
hydroisomerization of the lipid feedstock...producing a high proportion of branched alkanes
Implementation Method 5
contacting a feedstock with a catalyst composition in the presence of hydrogen
Data Source
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AI summary
A process is described for producing a hydrocarbon product. In examples, the process comprises contacting a feedstock with a catalyst composition in the presence of hydrogen, the feedstock including a lipid, and the catalyst composition being active for conversion of the lipid to the hydrocarbon product in a single step. The catalyst composition comprises an M1-[Sup] catalyst, where M1 is an active metal and [Sup] comprises an acidic support. In examples described, the process is used in the production of diesel-range fuel and/or jet fuel from lipid having a high yield of C11-C24 branched alkanes with high cetane value and low freezing point. In examples, the hydrocarbon product includes greater than 70 % measured by weight of C11-C24 alkanes based on the weight of the lipid, and the content of branched alkanes of the C11-C24 alkanes is greater than 60 % measured by weight of branched C11-C24 alkanes based on the weight of the C11-C24 alkanes.