Bioethanol-to-Jet Fuel Conversion with Online Freeze Point Control
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Solution Overview
Problem
Conventional methods for converting biorenewable sources to renewable jet fuel face inefficiencies and high costs due to the inability to accurately adjust freeze point specifications, leading to off-spec batches that require costly additives.
Innovation Solution
A method and system incorporating online analyzers to monitor the iso-to-normal ratio of hydrocarbons in real time, using a feedback control loop to adjust additives and ensure compliance with ASTM D7566 freeze point specifications, while optimizing dehydration, oligomerization, and hydrogenation processes to produce jet-range compatible hydrocarbons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to convert biorenewable sources to renewable jet fuel, then production cost is reduced, but freeze point specification compliance deteriorates leading to off-spec batches
Solution Approach 1:
The patent implements a feedback control system using online analyzers to monitor the iso-to-normal ratio in real-time during the hydrogenation process. The analyzer data feeds back to the control system, which automatically adjusts process parameters to maintain the ratio within specifications, ensuring freeze point compliance and eliminating the need for corrective additives.
Solution Approach 2:
The patent replaces manual sampling and offline laboratory analysis with automated online analyzers that use spectroscopic or chromatographic methods to continuously monitor hydrocarbon composition. This substitution enables real-time process control and eliminates delays associated with traditional mechanical sampling methods.
2Manufacturing precision
If online analyzers are implemented to monitor iso-to-normal ratio in real time, then freeze point specification compliance is improved, but device complexity increases
Solution Approach 1:
The online analyzer system is designed to perform multiple functions: it monitors the iso-to-normal ratio, determines when specification limits are approached, and provides feedback signals for process adjustment. This multi-functionality consolidates what would otherwise require separate monitoring and control systems into a single integrated device.
Solution Approach 2:
The control system automatically adjusts process parameters based on analyzer feedback without requiring manual intervention. The system serves itself by detecting deviations and implementing corrective actions, reducing the need for complex operator interfaces and manual control mechanisms.
3Manufacturing precision
If additive addition is used to adjust freeze point after hydrogenation, then specification compliance is improved, but production cost increases
Solution Approach 1:
The patent performs preliminary control of the iso-to-normal ratio during the hydrogenation process itself, preventing specification violations before they occur. By maintaining the ratio within acceptable ranges through real-time monitoring and adjustment, the need for post-process additive addition is eliminated.
Solution Approach 2:
The patent converts the potential harm of specification non-compliance into a benefit by using online monitoring to detect trends before they lead to off-spec batches. The system transforms what would be a costly quality failure into an opportunity for proactive process adjustment, saving both additive costs and production time.
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
Achieves high conversion efficiency to jet fuel-compatible hydrocarbons, reduces resource expenditure, and ensures compliance with ASTM D7566 specifications, enabling confident blending and carbon footprint reduction.
Implementation Method 1
dehydrating at least a portion of the bioethanol to produce an ethylene process stream comprising ethylene
Implementation Method 2
oligomerizing at least a portion of the ethylene process stream to produce the olefin process stream
Implementation Method 3
hydrogenating, in a hydrogenation reaction zone, at least a portion of an olefin process stream comprising olefins to produce a product stream comprising jet-range compatible hydrocarbons
Data Source
AI summary
Methods, apparatuses, and systems for the conversion of bioethanol to renewable jet fuel are disclosed. In an example embodiment, a method for converting bioethanol to renewable jet fuel includes providing an olefin process stream comprising olefins to a hydrogenation reaction zone, converting at least a portion of the olefin process stream to a product stream comprising jet-range compatible hydrocarbons, determining, in the hydrogenation reaction zone, an iso-to-normal ratio of a portion of the product stream via one or more online analyzers, in an instance wherein the determined iso-to-normal ratio fails to satisfy a predetermined iso-to-normal threshold ratio, determine at least one additive and an amount of the at least one additive to be added to the product stream, the at least one additive configured to adjust a freeze point of the product stream, and adding the at least one additive to the product stream prior to the product stream exiting the hydrogenation reaction zone.