Waste Plastic Pyrolysis Temperature Ramping for Light Oil Yield
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Solution Overview
Problem
Existing methods for pyrolyzing waste plastics are limited in improving pyrolysis efficiency and yield of high-quality light hydrocarbon oil, leading to excessive discharge of residual wax and limited production of high-value-added light hydrocarbons.
Innovation Solution
Performing pyrolysis of waste plastics under a temperature rise condition in the range of 430 to 450°C, with a controlled heating rate, to enhance decomposition efficiency and minimize residual wax discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pyrolysis is performed at a single temperature, then the process is simple to operate, but the yield of light hydrocarbon oil is limited and residual wax discharge is excessive
Solution Approach 1:
The patent applies dynamics by transitioning from a static single-temperature pyrolysis process to a dynamic temperature-rise process. The pyrolysis is conducted while continuously increasing the temperature from 430°C to 450°C over a specific time period (30-120 minutes), allowing the system to adapt to changing thermal conditions and maximize light hydrocarbon oil yield while minimizing residual wax formation.
Solution Approach 2:
The patent implements parameter changes by modifying the temperature parameter during the pyrolysis process. Instead of maintaining a constant temperature, the temperature is systematically increased within the 430-450°C range, which fundamentally changes the reaction kinetics and product distribution, thereby improving light hydrocarbon oil yield and reducing residual wax.
2Object-affected harmful factors
If conventional pyrolysis methods are used, then energy consumption is high, but greenhouse gas emissions are reduced compared to incineration
Solution Approach 1:
The patent optimizes energy consumption by implementing controlled parameter changes in the temperature profile. The gradual temperature increase from 430°C to 450°C allows for more efficient heat utilization and extended residence time at optimal decomposition temperatures, improving energy efficiency while maintaining low greenhouse gas emissions compared to incineration.
Solution Approach 2:
The patent applies continuity of useful action by maintaining a continuous temperature-rise process throughout the pyrolysis duration (30-120 minutes). This continuous heating approach ensures sustained decomposition reactions, maximizing fuel oil yield while improving overall energy efficiency and reducing waste compared to batch heating methods.
3Productivity
If catalytic cracking is used during pyrolysis, then contact decomposition reaction is enhanced, but the method is limited in improving pyrolysis efficiency and only suitable for recycling mixed oil
Solution Approach 1:
The patent achieves improved pyrolysis efficiency and broader applicability through parameter changes in the temperature profile (430-450°C range with controlled heating rate). This approach enhances decomposition efficiency for various waste plastic types including polyethylene and polypropylene without requiring catalysts, making the method universally applicable while achieving high light hydrocarbon oil yields.
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
Improves the yield of high-quality light hydrocarbon oil, reduces greenhouse gas emissions, and enhances process efficiency by minimizing residual wax discharge and energy consumption.
Implementation Method 1
subjecting a waste plastic raw material to pyrolysis under a temperature rise condition in the range of 430 to 450° C.
Implementation Method 2
condensing a gaseous stream produced by the pyrolysis to obtain liquid oil
Data Source
AI summary
The present disclosure provides a method of preparing pyrolysis oil from waste plastics, the method including: (S1) subjecting a waste plastic raw material to pyrolysis; (S2) condensing a gaseous stream produced by the pyrolysis to obtain liquid oil; and (S3) refining the liquid oil, wherein the pyrolysis is performed under a temperature rise condition in the range of 430 to 450° C.