Butadiene Recovery From 1,4-Butanediol Polyester Pyrolysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The accumulation of plastics in landfills and natural habitats due to their durability and low recycling efficiency necessitates a method for effectively recycling polymers to produce valuable monomers like butadiene.
Innovation Solution
A method involving the thermal decomposition of polyesters containing a repeating unit derived from 1,4-butanediol or polymer blends under a tin catalyst at elevated temperatures, typically above 400°C, without solvents, to produce butadiene with high purity and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If plastic recycling processes are adapted to plastic items containing only PET, then recycling efficiency is improved, but extensive sorting is required which increases process complexity
Solution Approach 1:
The patent changes the chemical parameters of the polyester structure (incorporating 1,4-butanediol repeating units) to enable thermal decomposition that produces butadiene monomer, transforming the recycling approach from mechanical sorting to chemical conversion that works with mixed plastic streams
Solution Approach 2:
The patent recovers valuable butadiene monomer from polyester waste through thermal decomposition, converting discarded plastic into useful chemical feedstock rather than requiring extensive sorting for material recovery
2Quantity of substance
If chemical recycling methods are used to recover chemical constituents, then monomer recovery is improved, but process complexity and purification requirements increase
Solution Approach 1:
The patent creates local quality in the polyester structure by incorporating specific repeating units derived from 1,4-butanediol, which enables selective thermal decomposition to produce butadiene with high purity directly from the polymer structure
Solution Approach 2:
The patent converts the harmful accumulation of plastic waste into beneficial butadiene monomer through thermal decomposition, transforming environmental pollution into valuable chemical feedstock
3Productivity
If thermal decomposition is performed at high temperatures above 400°C, then butadiene yield is improved, but energy consumption increases
Solution Approach 1:
The patent optimizes thermal decomposition parameters including temperature, catalyst concentration, and reaction time to achieve high butadiene yield while minimizing energy consumption through efficient heat utilization
Solution Approach 2:
The patent employs catalysts as intermediaries to facilitate the thermal decomposition reaction, enabling butadiene production at optimized temperatures and reducing the overall energy requirement for the process
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
This method recovers recyclable monomers efficiently, is environmentally friendly, and economically viable by utilizing a solvent-free process that minimizes impurities and side reactions.
Implementation Method 1
thermal decomposition of polyesters containing a repeating unit derived from 1,4-butanediol or polymer blends under a tin catalyst at elevated temperatures
Implementation Method 2
thermal decomposition of polyesters containing a repeating unit derived from 1,4-butanediol or polymer blends under a tin catalyst at elevated temperatures, typically above 400°C
Data Source
AI summary
The present invention provides a method of manufacturing butadiene comprising thermally decomposing a polyester containing a repeating unit derived from 1,4-butanediol or a polymer blend containing the same to manufacture butadiene.