Renewable Fuel Upgrading via Alkylation and Aromatic Saturation
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Solution Overview
Problem
Current renewable fuels, such as biodiesel and jet fuel, emit high levels of NOx and particulates due to their aromatic content, contributing to environmental pollution and climate change, and existing methods for reducing aromatics are inefficient or require significant energy input.
Innovation Solution
A method involving alkylation of C6-C12 aromatic hydrocarbons with alkylating agents to produce C8-C24 aromatic hydrocarbons, followed by hydrogenation using Group VIIIB metals to saturate these compounds, and subsequent separation in a distillation column to recover renewable fuels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If aromatic content is reduced from fuel to reduce harmful exhaust emissions, then emissions are reduced, but fuel energy content decreases leading to increased fuel consumption
Solution Approach 1:
The patent applies parameter changes by controlling the degree of aromatic saturation through hydrogenation. Instead of completely removing aromatics, the process selectively saturates aromatic rings to cycloalkanes, adjusting the aromatic content to an optimal level that balances emission reduction with energy content preservation. This partial transformation maintains sufficient heating value while achieving emission targets.
Solution Approach 2:
The patent converts the harmful aromatic compounds into beneficial cycloalkane compounds through controlled hydrogenation. The aromatic rings, which cause emissions problems, are transformed into saturated cycloalkane structures that have lower emissions characteristics while maintaining fuel properties. This transforms the harmful aromatic content into a beneficial component for emission control.
2Object-affected harmful factors
If existing methods are used to reduce aromatics, then emissions are reduced, but process efficiency is low or energy input is significant
Solution Approach 1:
The patent extracts and removes aromatic compounds from the fuel stream through selective hydrogenation. The aromatic rings are targeted and converted to cycloalkanes, effectively extracting the problematic aromatic portion from the fuel mixture. This selective removal approach improves process efficiency by focusing on only the harmful components rather than processing the entire fuel stream.
Solution Approach 2:
The patent replaces complex mechanical separation systems with chemical hydrogenation processes. Instead of using multiple separation units, membranes, or advanced filtration systems to remove aromatics, the process uses catalytic hydrogenation to chemically transform aromatics into cycloalkanes, which can then be separated more easily. This substitution of chemical transformation for mechanical separation improves overall process efficiency.
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
Reduces harmful emissions by converting aromatic hydrocarbons into less polluting cycloalkanes, improving fuel quality and process efficiency while minimizing energy consumption.
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
Implementation Method 3
the hydrogenation zone comprises a hydrogenation reactor comprising a hydrogenation catalyst
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). The products can be used as renewable jet fuel and renewable diesel fuels, for example.