Pyrolysis Oil Viscosity Reduction via Controlled Heating
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Solution Overview
Problem
Pyrolysis oil, due to its high viscosity and aggressive carboxylic acid content, cannot be effectively processed using conventional centrifugal separator systems, making it unsuitable for use as a fuel in internal combustion engines.
Innovation Solution
Reducing the viscosity of pyrolysis oil by heating it to a controlled temperature range (40-70°C) and using a two-phase clarification separator or decanter to separate solids, followed by rapid cooling to prevent thermal decomposition and polymerization, allowing for efficient clarification and preparation for use as a fuel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If pyrolysis oil is heated to reduce viscosity for centrifugal clarification, then the oil becomes processable, but thermal decomposition and polymerization occur at higher temperatures
Solution Approach 1:
The patent applies parameter changes by precisely controlling the heating temperature within the range of 40-70°C and maintaining residence time below 20 minutes. This optimized parameter combination reduces viscosity sufficiently for centrifugal separation while staying below the threshold for significant thermal decomposition and polymerization reactions.
Solution Approach 2:
The patent implements the 'rushing through' principle by minimizing the residence time of pyrolysis oil in the heated state to less than 20 minutes. This rapid processing approach allows the oil to pass through the critical temperature zone quickly, reducing viscosity for separation while limiting the time available for decomposition reactions to occur.
2Device complexity
If conventional centrifugal separator systems are used on pyrolysis oil, then the system design remains simple, but the high viscosity and aggressive carboxylic acids make processing ineffective
Solution Approach 1:
The patent changes the temperature parameter of the pyrolysis oil from ambient to 40-70°C before entering the centrifugal separator. This parameter change reduces the oil's viscosity to a level where conventional centrifugal separators can effectively separate solids, maintaining simple device design while achieving productive clarification.
3Reliability
If pyrolysis oil is cooled rapidly after clarification, then polymerization is prevented, but the cooling process requires additional time and energy management
Solution Approach 1:
The patent implements continuous cooling immediately after centrifugal clarification without interrupting the process flow. This continuous action rapidly removes heat from the clarified oil, preventing polymerization while minimizing the time the oil remains in the vulnerable temperature range. The cooling is integrated into the process sequence rather than being a separate batch operation.
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
Enables the use of pyrolysis oil as a fuel by reducing its solids content and viscosity, ensuring it can be processed efficiently and safely in internal combustion engines, while maintaining energy efficiency and preventing corrosion and thermal issues.
Implementation Method 1
By reducing the viscosity of the pyrolysis oil, which is highly viscous at room temperature, centrifugal clarification of the pyrolysis oil product is made possible
Implementation Method 2
the pyrolysis oil is clarified in a separator, in particular a two-phase clarification separator
Implementation Method 3
Thermal decomposition and, for example, polymerization can be largely prevented if the pyrolysis oil is cooled shortly after the pyrolysis oil has been clarified
Data Source
AI summary
Purifying pyrolysis oil, comprises (a) purifying the pyrolysis oil in a centrifuge, and (b) heating the pyrolysis oil to reduce the viscosity of the pyrolysis oil, before and/or during the step (a). An independent claim is also included for a plant for purifying the pyrolysis oil, comprising at least one source for heating the pyrolysis oil, and at least one centrifuge for purifying the pyrolysis oil, which are connected to each other through at least one pipe.