Hydrocarbon Compositions from Plastic Pyrolysis
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Solution Overview
Problem
There is a lack of effective processes for recycling mixed polyolefin waste plastics into value-added chemical and refinery feedstock products at an industrially significant scale, limiting the recycling of post-consumer and post-industrial plastics.
Innovation Solution
The development of hydrocarbon-based compositions derived from the pyrolysis of post-consumer and post-industrial plastics, specifically waxes and oils, which are produced through thermal depolymerization, meeting stringent chemical and physical property specifications, such as molecular weight, boiling point, and impurity levels, enabling their use as industrial-scale feedstocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If pyrolysis is used to convert mixed polyolefin waste plastics into hydrocarbon compositions, then value-added chemical and refinery feedstock products are produced, but the process complexity and difficulty of controlling product specifications increase
Solution Approach 1:
The patent applies parameter changes by systematically adjusting pyrolysis conditions including temperature ranges (500-900°C), heating rates (5-50°C/min), residence times (0.1-10 seconds), and atmosphere composition to precisely control the molecular weight distribution and boiling point ranges of the resulting hydrocarbon compositions, enabling production of specific wax and oil fractions with targeted properties
Solution Approach 2:
The patent segments the complex pyrolysis process into distinct operational phases (drying, heating, pyrolysis, cooling) and separates the product stream into different hydrocarbon fractions (gases, waxes, oils) based on boiling point ranges, allowing independent optimization and control of each segment to achieve desired product specifications
2Reliability
If thermal depolymerization is applied to produce waxes and oils with specific molecular weights, then refined products like lubricating oils and fuels can be made, but the energy consumption and process time increase
Solution Approach 1:
The patent applies preliminary action by pre-drying the plastic feedstock to remove moisture before pyrolysis, and by pre-heating the reaction zone to optimal temperature ranges before introducing the feedstock, which reduces overall energy consumption and improves the reliability of the resulting waxes and oils by ensuring consistent thermal conditions during depolymerization
Solution Approach 2:
The patent implements continuous pyrolysis operation with continuous feedstock introduction and product removal, maintaining steady-state thermal conditions that improve energy efficiency and product consistency, allowing the system to operate at optimal temperatures without repeated heating cycles while producing reliable refined products
3Adaptability or versatility
If mixed polyolefin streams with broad compositions are recycled, then the scope of recyclable plastics increases, but the difficulty of producing consistent product quality worsens
Solution Approach 1:
The patent applies local quality by targeting specific molecular weight ranges and hydrocarbon types (paraffinic, naphthenic, aromatic) in different product fractions, allowing the process to handle mixed polyolefin inputs while producing consistent quality outputs by focusing on local compositional characteristics rather than requiring uniform feedstock composition
Solution Approach 2:
The patent produces composite hydrocarbon compositions containing mixed hydrocarbon types (paraffinic, naphthenic, aromatic) in controlled proportions, creating consistent quality products from variable mixed polyolefin feedstocks by combining different hydrocarbon components that complement each other to achieve stable overall product properties
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
These compositions can be used as raw materials for producing refined products like lubricating oils, paraffin wax, and fuels, facilitating the recycling of plastics into high-value products while reducing waste and environmental impact.
Implementation Method 1
hydrocarbon based compositions derived from pyrolysis of a feedstock comprising post-consumer and/or post-industrial plastics
Implementation Method 2
the wax comprises a mixture of different hydrocarbons, any of which can optionally be substituted, wherein from 60% to 80% of the mixture (w/w) comprises C20-C45 hydrocarbons
Data Source
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AI summary
Disclosed herein are hydrocarbon based compositions derived from pyrolysis of a feedstock comprising post-consumer and/or post-industrial plastics and methods of making and use thereof.