Pyrolysis Oil Stabilization With Low-Hydrogen Selective Hydrogenation
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Solution Overview
Problem
The cost-effective operation of small-scale plants for thermal decomposition of solid waste, such as plastic and biomass, produces unstable raw pyrolysis oil that is prone to solidification during transportation due to high reactivity, requiring extensive hydrogen consumption and large-scale processing facilities for stabilization.
Innovation Solution
A decentralized stabilization process that minimizes hydrogen consumption by converting only the most reactive compounds in pyrolysis oil at moderate temperatures and pressures, using a limited amount of hydrogen to stabilize the oil for transportation and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If decentralized thermal decomposition plants are used to minimize solid feedstock transport, then feedstock transport cost is reduced, but the raw pyrolysis oil produced becomes highly unstable and prone to solidification during transportation
Solution Approach 1:
The process segments the stabilization treatment into a separate decentralized unit that can be integrated into existing thermal decomposition plants. This allows the stabilization function to be added without requiring complete process redesign, enabling local stabilization while maintaining the decentralized plant structure that minimizes feedstock transport.
Solution Approach 2:
The stabilization process is applied immediately after pyrolysis oil production in the same decentralized plant, preventing instability issues before transportation occurs. This preliminary stabilization action converts reactive compounds in the raw pyrolysis oil, ensuring the oil remains stable during subsequent transport to centralized upgrade facilities.
2Reliability
If extensive processing is applied to stabilize raw pyrolysis oil to current trade standards, then product quality is improved, but the process complexity and scale requirements increase
Solution Approach 1:
The invention extracts and addresses only the specific stabilization function needed to prevent solidification and polymerization during transport. Rather than implementing complete extensive processing, the patent focuses on the critical stabilization step that can be performed in decentralized plants, separating this function from the more complex upgrade processes that remain centralized.
Solution Approach 2:
The stabilization process uses locally available hydrogen and applies treatment specifically targeted at the instability issues of raw pyrolysis oil. The process is designed to work with the specific characteristics of pyrolysis oil from various feedstocks, providing localized adaptation to different oil compositions without requiring universal complex processing infrastructure.
3Reliability
If large scale hydroprocessing plants are used for pyrolysis oil upgrading, then process support and utilities are improved, but the suitability for small scale operation decreases
Solution Approach 1:
The overall processing system is segmented into two distinct parts: a decentralized stabilization unit that can operate at small scale with minimal infrastructure, and a centralized upgrade facility that provides comprehensive processing support. This segmentation allows each part to be optimized for its specific function and scale requirements.
Solution Approach 2:
The stabilized pyrolysis oil acts as an intermediary product between the decentralized stabilization process and the centralized upgrade facility. This intermediary state allows the oil to be transported efficiently while maintaining stability, bridging the gap between small-scale production and large-scale processing capabilities.
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 process effectively stabilizes pyrolysis oil for transportation and storage with reduced hydrogen use, enabling decentralized production and subsequent centralized upgrading to quality hydrocarbons for fuels or petrochemicals.
Implementation Method 1
directing to a catalytic process as raw liquid feedstock at least an amount of said fluid product of thermal decomposition and an amount of hydrogen to contact a material catalytically active in hydrogenation of conjugated diolefinic carbon-carbon bonds under active conditions for hydrogenation of conjugated diolefinic carbon-carbon bonds
Data Source
AI summary
A first aspect of the invention relates to a process for production of a stabilized hydrocarbon product from solid feedstock, said method comprising the steps of, providing a solid feedstock for thermal decomposition, directing said solid feedstock for thermal decomposition to a thermal decomposition process to provide a fluid product of thermal decomposition and a solid phase, directing as raw feedstock at least an amount of said fluid product of thermal decomposition and an amount of hydrogen to contact a material catalytically active in hydrogenation of conjugated diolefinic carbon-carbon bonds under active conditions for hydrogenation of conjugated diolefinic carbon-carbon bonds, characterized in the ratio between hydrogen and raw feedstock is from 1 Nm3/m3 to 100 Nm3/m3. This has the associated benefit of such a process requiring only a low amount of hydrogen, while still providing a stabilized hydrocarbon product for transport.