Renewable Fuel Upgrading via Alkylation and Aromatic Hydrogenation
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Solution Overview
Problem
Existing renewable fuels, such as biodiesel and jet fuel, contribute to harmful emissions due to high aromatic content, which increases particulate emissions and combustion zone temperatures, and have lower heating values leading to increased fuel consumption.
Innovation Solution
A method involving alkylation of a renewable hydrocarbon stream comprising C6-C12 aromatic compounds with alkylating agents, followed by hydrogenation to saturate aromatic hydrocarbons, and subsequent separation to produce renewable fuels with reduced aromatics, thereby improving emissions and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If aromatic content is reduced from the fuel, then harmful exhaust emissions are reduced, but fuel formulation complexity increases
Solution Approach 1:
The fuel formulation process is divided into multiple treatment zones: alkylation zone for initial aromatic modification, separation zone for removing by-products, hydrogenation zone for saturating remaining aromatics, and final separation zone for product purification. This segmentation allows systematic reduction of aromatic content while managing process complexity through modular design.
Solution Approach 2:
The alkylation step is performed as a preliminary action before hydrogenation. In the alkylation zone, aromatic compounds are alkylated to modify their structure, and by-products are removed in the separation zone. This preliminary treatment reduces the burden on the subsequent hydrogenation zone, making the overall aromatic reduction process more efficient and manageable.
2Object-generated harmful factors
If aromatic content is reduced from the fuel, then particulate emissions are reduced, but process complexity increases
Solution Approach 1:
The process is divided into functional segments: alkylation zone for aromatic modification, separation zone for by-product removal, hydrogenation zone for aromatic saturation, and final separation for fuel purification. Each segment addresses specific aspects of aromatic reduction, enabling effective particulate emission reduction while organizing process complexity into manageable modules.
Solution Approach 2:
Alkylation and by-product removal are performed as preliminary actions before the main hydrogenation step. This preliminary treatment modifies aromatic structures and removes interfering by-products, making the subsequent hydrogenation process more efficient at reducing particulate emissions while simplifying the overall process control.
3Temperature
If aromatic content is reduced from the fuel, then combustion zone temperature is reduced, but processing steps increase
Solution Approach 1:
The fuel treatment process is segmented into alkylation zone, separation zone, hydrogenation zone, and final separation zone. Each zone performs a specific function in reducing aromatic content, which directly controls combustion zone temperature. This segmentation allows systematic temperature control through progressive aromatic removal.
Solution Approach 2:
Alkylation and by-product removal are performed as preliminary actions to modify aromatic structures before hydrogenation. This preliminary modification makes the aromatics more susceptible to hydrogenation, enabling more effective temperature control during combustion while organizing the processing steps into a logical sequence.
4Object-generated harmful factors
If lower heating value fuels are used, then emission reduction is achieved, but fuel consumption increases
Solution Approach 1:
The chemical composition parameters of the fuel are changed through alkylation and hydrogenation processes. By modifying the molecular structure of aromatic compounds (adding alkyl groups and saturating rings), the fuel achieves better combustion characteristics and higher heating value, reducing the quantity of fuel needed while maintaining emission reduction benefits.
Solution Approach 2:
The fuel is transformed into a composite hydrocarbon mixture with optimized properties. The alkylation and hydrogenation processes create a composite fuel composition that combines the emission-reduction benefits of modified aromatics with improved heating value, thereby reducing overall fuel consumption while achieving emission targets.
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 reduces harmful emissions and increases fuel efficiency by transforming aromatic hydrocarbons into less harmful cyclohexanes, resulting in cleaner diesel and jet fuels with lower carbon footprints.
Implementation Method 1
alkylating a renewable hydrocarbon stream comprising C6-C12 aromatic compounds in an alkylation zone with alkylating agents to produce an alkylated renewable hydrocarbon stream comprising C8-C24 aromatic hydrocarbons
Implementation Method 2
hydrogenating at least part of the alkylated renewable hydrocarbon stream obtained in (1) in a hydrogenation zone with hydrogen to saturate at least a portion of the C8-C24 aromatic hydrocarbons in the alkylated renewable hydrocarbon stream and produce a hydrogenated renewable hydrocarbon stream
Implementation Method 3
following alkylation, the alkylated renewable hydrocarbon stream is fed to a separation zone to separate the alkylated renewable hydrocarbon stream into a purified alkylated stream and a by-products stream comprising water
Data Source
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AI summary
Disclosed are methods and systems for producing renewable fuels by upgrading a renewable hydrocarbon stream (e.g., a stream comprising C6-C12 aromatic hydrocarbons) by alkylating the renewable hydrocarbon stream with alkylating agents to produce an alkylated renewable hydrocarbon stream comprising C8-C24 aromatic hydrocarbons and hydrogenating the alkylated renewable hydrocarbon stream to produce a hydrogenated renewable hydrocarbon stream. The products can be used as renewable jet fuel and renewable diesel fuels, for example.