Plastic Waste Catalytic Pyrolysis With Alkane Oxidation Integration
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Solution Overview
Problem
Plastic recycling is challenging due to the chemical nature of long chain organic polymers and low economic returns, with limited capacity and yield of chemical recycling processes, and a need to monetize methane and other light hydrocarbons beyond their value as fuels.
Innovation Solution
An integrated process combining alkane oxidation with catalytic pyrolysis of plastics using a fluid bed reactor, incorporating zeolite catalysts to produce olefins and aromatics, with heat recovery and integration with conventional hydrocarbon upgrading facilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If chemical recycling processes are used to convert plastic waste to useful chemicals, then valuable products like olefins and aromatics can be produced, but the process capacity and yield are limited due to the availability of waste plastics
Solution Approach 1:
The patent combines alkane oxidation and catalytic pyrolysis into a single integrated process. The alkane oxidation step generates olefins and thermal energy that are directly fed into the catalytic pyrolysis reactor, merging two separate processes to achieve synergistic effects that increase both yield and capacity simultaneously
Solution Approach 2:
The integrated process serves multiple functions: it converts methane and light hydrocarbons to olefins, generates thermal energy for pyrolysis, and processes plastic waste to aromatics. This multi-functionality allows the system to overcome limitations of single-purpose chemical recycling plants
2Quantity of substance
If conventional catalytic pyrolysis is used to process plastic waste, then olefins and aromatics can be produced, but the economic returns are low and methane value is limited to fuel use
Solution Approach 1:
The patent converts methane, which is typically used only as fuel, into a valuable feedstock for olefin production through oxidation. This transforms a low-value commodity into a high-value chemical intermediate, dramatically improving economic viability while increasing production of valuable materials
Solution Approach 2:
The process changes the chemical state of methane through oxidation to form olefins, and then uses thermal energy from this reaction to drive pyrolysis at high temperatures. These parameter changes (chemical transformation and temperature control) enable conversion of low-value inputs to high-value outputs
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
Increases the yield of valuable materials like olefins and aromatics, enhances process capacity, and monetizes methane and light hydrocarbons, integrating plastics recycling with conventional refining processes.
Implementation Method 1
reacting a stream comprising methane or ethane or a mixture of C1-C4 alkanes with oxygen to produce a product stream comprising ethylene
Implementation Method 2
reacting the mixed plastics and the alkane oxidation product stream in the catalytic pyrolysis reactor at a temperature above 350° C. to produce a vapor product
Implementation Method 3
Plas-TCatTM is a catalytic fluid bed process using zeolite catalysts to convert polymer/plastic material
Implementation Method 4
Plas-TCatTM is a catalytic fluid bed process using zeolite catalysts
Data Source
AI summary
A method of producing olefinic and aromatic hydrocarbons from waste plastics comprising feeding a mixture of plastics along with the products of the oxidation of light hydrocarbons to a process in which the feed mixture is catalytically pyrolyzed to produce olefins and aromatics.