Textile-Rubber Pyrolysis Feedstock for Higher-Quality Oil Yield
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Solution Overview
Problem
Existing processes for preparing pyrolysis oil from end-of-life tires result in oils with poor quality and low yield, necessitating an improvement in efficiency and cost-effectiveness.
Innovation Solution
A process involving a mixture of end-of-life textile and rubber materials, including carbon black, subjected to pyrolysis conditions to produce a pyrolysis oil fraction and recovered carbon black, with specific compositions and post-treatments like hydrogenation and dehalogenation to enhance oil quality and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If pyrolysis is performed on end-of-life tires using conventional processes, then pyrolysis oil is produced, but the oil yield is low and the oxygen content is high resulting in poor quality
Solution Approach 1:
The patent applies parameter changes by modifying the feedstock composition (adding textile materials), pyrolysis temperature (300-900°C range), heating rate, and residence time to optimize both oil yield and quality, achieving lower oxygen content and higher yield simultaneously
Solution Approach 2:
The patent uses composite feedstock consisting of end-of-life rubber materials combined with end-of-life textile materials in specific ratios, creating a composite mixture that produces pyrolysis oil with improved properties compared to pure rubber pyrolysis
2Productivity
If pyrolysis is performed on whole waste tires, then pyrolysis products are obtained, but the process is difficult to control and maintain constant due to low thermal conductivity
Solution Approach 1:
The patent segments the tire material by separating rubber, textile, and steel components, then processes the rubber and textile fractions together in controlled proportions, improving heat distribution and process control
Solution Approach 2:
The patent applies different processing conditions to different feedstock components by controlling the ratio of rubber to textile materials, optimizing local reaction conditions for each component type within the mixed feedstock
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
The process achieves improved pyrolysis oil yields with lower oxygen content and cost-effectiveness by utilizing a mixture of end-of-life textile and rubber materials, enhancing the quality and efficiency of pyrolysis oil production.
Implementation Method 1
subjecting the mixture M1 to pyrolysis conditions, obtaining a liquid pyrolysis oil fraction FP and a solid recovered carbon black fraction FCB
Implementation Method 2
subjecting the liquid pyrolysis oil fraction FP to hydrogenation in at least one hydrogenation zone Z1 containing a heterogeneous hydrogenation catalyst
Data Source
AI summary
A process for preparing a pyrolysis oil, the process comprising (1) providing a mixture M1 comprising at least one end-of-life textile material and at least one end-of-life rubber material containing carbon black; (2) subjecting the mixture M1 to pyrolysis conditions, obtaining a liquid pyrolysis oil fraction FP and a solid recovered carbon black fraction FCB; wherein from 95 to 100 weight-% of the mixture M1 consist of the at least one end-of-life textile material and the at least one end-of-life rubber material containing carbon black.