Polymer Waste Cracking With Selective Dissolution and Low-Temp Catalysis
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Solution Overview
Problem
Existing methods for recycling polymer waste face inefficiencies due to ineffective separation of target polymers from non-target products, high energy requirements, and catalyst losses during catalytic cracking, leading to reduced yield and increased energy consumption.
Innovation Solution
A method involving the heating of polymer waste in a liquid hydrocarbon mixture to dissolve target polymers, followed by catalytic cracking with an ultrafine catalyst at low temperatures, ensuring effective separation and efficient catalyst use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If catalytic cracking is performed at high temperatures, then the cracking reaction proceeds efficiently, but energy requirements increase significantly and yield of final commercial product decreases
Solution Approach 1:
The patent changes the temperature parameter from conventional high temperatures (450-500°C) to low temperatures (300-400°C) by modifying the catalyst properties. The catalyst composition and preparation method are altered to achieve high activity at lower temperatures, thereby reducing energy consumption while maintaining cracking efficiency
Solution Approach 2:
The patent uses a composite catalyst system comprising multiple metal components (such as zeolites combined with other metal oxides or salts) that work synergistically to provide high catalytic activity at low temperatures. This composite structure enables efficient cracking reactions without requiring high energy input
2Productivity
If a dispersed catalyst is directly loaded into the catalytic cracking reactor, then the catalytic cracking process can be carried out, but catalyst losses occur due to carryover by technological flows
Solution Approach 1:
The patent introduces a liquid hydrocarbon mixture as an intermediary medium to carry the dispersed catalyst into the reactor. This intermediary approach allows the catalyst to be delivered in a controlled manner, reducing direct contact losses and carryover by technological flows while maintaining catalytic activity
Solution Approach 2:
The patent replaces the conventional mechanical loading of solid catalyst particles with a liquid-phase delivery system. The catalyst is dispersed in a liquid hydrocarbon mixture, which facilitates smoother flow dynamics and reduces mechanical losses associated with particle handling and carryover
3Ease of manufacture
If polymer waste is processed without preliminary separation, then the processing procedure is simpler, but effective separation of target polymers from non-target products cannot be achieved
Solution Approach 1:
The patent performs preliminary dissolution of polymer waste in a liquid hydrocarbon mixture before catalytic cracking. This preliminary action selectively dissolves target polymers while leaving non-target materials undissolved, enabling subsequent easy separation and ensuring high purity of the desired products without complex separation procedures
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 approach enhances the yield of hydrocarbons from polymer waste by reducing energy consumption and minimizing catalyst losses, thereby improving the overall process efficiency.
Implementation Method 1
heating the pre-shredded polymer waste in the presence of a liquid hydrocarbon mixture to a temperature sufficient for the transition of at least one target polymer from the polymer waste to solution
Implementation Method 2
catalytic cracking of a polymer-containing mixture in the presence of an ultrafine catalyst at a temperature of at least 360° C. to obtain a mixture of liquid and gaseous hydrocarbons
Implementation Method 3
catalytic cracking of a polymer-containing mixture in the presence of an ultrafine catalyst at a temperature of at least 360° C.
Data Source
AI summary
A method for producing hydrocarbons from polymer waste includes: A) heating pre-crushed polymer waste in the presence of a mixture of liquid hydrocarbons to a temperature sufficient to convert at least one target polymer from the polymer waste to solution, but a lower transition temperature to solution for the remaining components of the polymer waste, to produce a polymer-containing mixture including a solution of at least one target polymer in the liquid hydrocarbon mixture, and B) catalytic cracking of the polymer-containing mixture in the presence of an ultrafine catalyst at a temperature from at least 360° C. to produce a mixture of liquid and gaseous hydrocarbons.