Electrochemical Hydrogenation for Bio-oil Stabilization
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Solution Overview
Problem
Bio-oils from fast pyrolysis and hydrothermal liquefaction are challenging to process due to their reactivity, corrosiveness, and lack of thermal stability, leading to issues like viscosity increase, solid formation, and catalyst site blocking during conventional upgrading processes.
Innovation Solution
An electrolysis system with an electrolysis cell using electrochemical hydrogenation (ECH) to reduce reactive functionalities, remove small organic acids and water, and increase hydrogen content in bio-oils and biocrudes, thereby stabilizing them and reducing corrosivity, employing a single or dual membrane cell configuration without the need for supporting electrolytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional thermal processing is used to upgrade bio-oils, then processing can be performed, but coke formation blocks catalyst sites and plugs reactors
Solution Approach 1:
The patent replaces thermal processing with electrochemical processing. Instead of using high temperature thermal fields that cause coke formation, the invention uses electrochemical reactions at mild temperatures to achieve bio-oil upgrading, thereby eliminating the harmful thermal effects while maintaining processing capability
Solution Approach 2:
The patent changes the processing parameters from high temperature thermal conditions to mild temperature electrochemical conditions. By operating at ambient or near-ambient temperatures with electrochemical potential applied, the process avoids thermal degradation and coke formation while still achieving effective bio-oil upgrading
2Stability of the object's composition
If hydrogenation is performed at elevated temperatures to stabilize bio-oils, then stability improves, but thermal breakdown forms coke that blocks catalyst sites
Solution Approach 1:
The patent substitutes thermal hydrogenation with electrochemical hydrogenation. Instead of using thermal energy to drive hydrogenation reactions, the invention uses electrochemical energy to reduce oxygenated compounds and stabilize bio-oil at mild temperatures, preventing coke formation while achieving the desired stability
Solution Approach 2:
The patent changes the temperature parameter from elevated thermal conditions to mild electrochemical conditions. By performing hydrogenation at low temperatures through electrochemical means, the process achieves bio-oil stabilization without the thermal breakdown that leads to coke formation
3Ease of operation
If supporting electrolytes are added to enable electrochemical processing, then electrochemical reactions can proceed, but process complexity and cost increase
Solution Approach 1:
The patent employs a self-service approach where the bio-oil feedstock itself serves as the electrolyte medium for electrochemical reactions. By utilizing the conductive properties of the bio-oil without requiring external supporting electrolytes, the process simplifies the system design and eliminates the need for additional chemical additives
Solution Approach 2:
The patent extracts and eliminates the requirement for supporting electrolytes from the electrochemical processing system. By demonstrating that electrochemical reactions can proceed effectively using only the bio-oil feedstock as the medium, the invention removes the complexity associated with electrolyte management, purification, and disposal
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 ECH process enhances carbon and hydrogen efficiency, stabilizes bio-oils, reduces corrosivity, and allows for conversion into transportation fuels under mild conditions, avoiding coke formation and catalyst deactivation, with potential for reduced capital expenditures and improved downstream processing efficiency.
Implementation Method 1
The electrolysis system performs electrochemical hydrogenation (ECH) that reduces reactive functionalities in the bio-oils and biocrudes
Implementation Method 2
passing a current through the electrolysis cell to convert molecules in the feed to a reduction product
Implementation Method 3
an electrolysis cell that includes at least one ion-selective membrane
Implementation Method 4
The ECH process uses protons and water as a hydrogen source
Implementation Method 5
the electrolysis cell includes a catalyst on one or more of the ion-selective membranes
Data Source
AI summary
A system and process are disclosed for electrochemically upgrading bio-oils and bio-crudes that enhance yields of selected reduction products for subsequent production of bio-based fuels.